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Nanoparticles (NPs), as a novel source of industrial materials, have been extensively used in recent years which ultimately ends up in soils and may cause toxic effects on plants. Gibberellic acid (GA), phytohormone, has ability to minimize abiotic stresses in plants. The role of GA in minimizing titanium dioxide (TiO2) NPs stress in plants is still unknown. In current study, soil was spiked with TiO2 NPs (0, 100, 200, 400, 600 mg/kg) while GA was foliar-sprayed at different concentrations during wheat growth. The findings revealed that TiO2 NPs increased the growth, chlorophyll contents, and nutrient (P, K, Fe, Mn) concentrations in tissues till 400 mg/kg and then decrease was observed at 600 mg/kg level of NPs whereas the values of these parameters were higher compared to control irrespective of NPs levels. The NPs enhanced the antioxidant activities (SOD, POD, CAT, APX) and reduced the oxidative stress (EL, H2O2, MDA) in leaves over the control. Foliar GA further improved the growth, yield, nutrients and antioxidant activities while minimized the oxidative stress compared to respective sole NPs- treatments. The interactive effects of NPs and GA were dose dependent. The results proved that studied doses of TiO2 NPs were not toxic to wheat plants except the highest level (600 mg/kg) used and GA positively affected the yield of wheat under TiO2 NPs application. The GA can be used to improve crop growth in the presence of NPs which, however, needs further investigation at higher doses of TiO2 NPs in various crops.
Hesham F. Alharby; Muhammad Rizwan; Azka Iftikhar; Khalid Mahmud Hussaini; Muhammad Zia Ur Rehman; Atif A. Bamagoos; Basmah M. Alharbi; Muhammad Asrar; Tahira Yasmeen; Shafaqat Ali. Effect of gibberellic acid and titanium dioxide nanoparticles on growth, antioxidant defense system and mineral nutrient uptake in wheat. Ecotoxicology and Environmental Safety 2021, 221, 112436 .
AMA StyleHesham F. Alharby, Muhammad Rizwan, Azka Iftikhar, Khalid Mahmud Hussaini, Muhammad Zia Ur Rehman, Atif A. Bamagoos, Basmah M. Alharbi, Muhammad Asrar, Tahira Yasmeen, Shafaqat Ali. Effect of gibberellic acid and titanium dioxide nanoparticles on growth, antioxidant defense system and mineral nutrient uptake in wheat. Ecotoxicology and Environmental Safety. 2021; 221 ():112436.
Chicago/Turabian StyleHesham F. Alharby; Muhammad Rizwan; Azka Iftikhar; Khalid Mahmud Hussaini; Muhammad Zia Ur Rehman; Atif A. Bamagoos; Basmah M. Alharbi; Muhammad Asrar; Tahira Yasmeen; Shafaqat Ali. 2021. "Effect of gibberellic acid and titanium dioxide nanoparticles on growth, antioxidant defense system and mineral nutrient uptake in wheat." Ecotoxicology and Environmental Safety 221, no. : 112436.
Salinity stress is one of the major environmental stresses that impose global socio-economic impacts, as well as hindering crop productivity. Halotolerant plant growth-promoting rhizobacteria (PGPR) having potential to cope with salinity stress can be employed to counter this issue in eco-friendly way. In the present investigation, halotolerant PGPR strains AP6 and PB5 were isolated from saline soil and characterized for their biochemical, molecular and physiological traits. Sequencing of 16S rRNA gene and comparison analysis confirmed the taxonomic affiliation of AP6 with Bacillus licheniformis and PB5 with Pseudomonas plecoglossicida. The study was carried out in pots with different levels of induced soil salinity viz. 0, 5, 10 and 15 dSm-1 to evaluate the potential of bacterial inoculants in counteracting salinity stress in sunflower at different plant growth stages (30, 45 and 60 days after sowing). Both the bacterial inoculants were capable of producing indole acetic acid and biofilm, solubilizing inorganic rock phosphate and having ACC deaminase activity of varying extent. The PGPR inoculated plants expressed significantly augmented fresh and dry biomass, plant height, root length and yield plant-1. Ameliorative significance of applied bacterial inoculants was also evidenced by mitigating oxidative stress through upregulation of catalase (CAT), superoxide dismutase (SOD) and guaiacol peroxidase (GPX) antioxidant enzymes. Increase in photosynthetic pigments, gas exchange activities and nutrient uptake are some other accompanying mechanisms those were boosted with the application of salt tolerant biofilm producing PGPR bacterial strains on sunflower plants. Although increase in salinity stress levels has gradually decreased the plant’s output compared to non-salinized plants however, the plants inoculated with PGPR confronted salinity stress in much better way than uninoculated plants. Owing to the wide action spectrum of these bacterial inoculants, it was concluded that these isolates could serve as effective bioinoculants and salinity stress alleviator for sunflower (oil seed crop) by increasing crop productivity in marginalized agricultural corridors.
Tahira Yasmeen; Aqeel Ahmad; Muhammad Saleem Arif; Muhammad Mubin; Khadija Rehman; Sher Muhammad Shahzad; Shahid Iqbal; Muhammad Rizwan; Shafaqat Ali; Mohammed Nasser Alyemeni; Leonard Wijaya. Biofilm forming rhizobacteria enhance growth and salt tolerance in sunflower plants by stimulating antioxidant enzymes activity. Plant Physiology and Biochemistry 2020, 156, 242 -256.
AMA StyleTahira Yasmeen, Aqeel Ahmad, Muhammad Saleem Arif, Muhammad Mubin, Khadija Rehman, Sher Muhammad Shahzad, Shahid Iqbal, Muhammad Rizwan, Shafaqat Ali, Mohammed Nasser Alyemeni, Leonard Wijaya. Biofilm forming rhizobacteria enhance growth and salt tolerance in sunflower plants by stimulating antioxidant enzymes activity. Plant Physiology and Biochemistry. 2020; 156 ():242-256.
Chicago/Turabian StyleTahira Yasmeen; Aqeel Ahmad; Muhammad Saleem Arif; Muhammad Mubin; Khadija Rehman; Sher Muhammad Shahzad; Shahid Iqbal; Muhammad Rizwan; Shafaqat Ali; Mohammed Nasser Alyemeni; Leonard Wijaya. 2020. "Biofilm forming rhizobacteria enhance growth and salt tolerance in sunflower plants by stimulating antioxidant enzymes activity." Plant Physiology and Biochemistry 156, no. : 242-256.
Heavy metal contamination is currently a major environmental concern, as most agricultural land is being polluted from municipal discharge. Among various other pollutants, cadmium (Cd), one of the most harmful heavy metals, enters into the food chain through the irrigation of crops with an industrial effluent. In the present study, a pot experiment was designed to assess the effect of different nitrogen (N)-fertilizer forms in the phytoremediation of Cd through Solanum nigrum L. Two types of N fertilizers (NH4NO3 and urea) were applied to the soil in different ratios (0:0, 100:0, 0:100, and 50:50 of NH4NO3 and urea, individually) along with different Cd levels (0, 25, and 50 mg kg−1). The plants were harvested 70 days after sowing the seeds in pots. Cadmium contamination significantly inhibited the growth of leaves and roots of S. nigrum plants. Cadmium contamination also induced oxidative stress; however, the application of N-fertilizers increased the plant biomass by inhibiting oxidative stress and enhancing antioxidants’ enzymatic activities. The greatest plant growth was observed in the urea-treated plants compared with the NH4NO3-treated plants. In addition, urea-fed plants also accumulated higher Cd concentrations than NH4NO3-fed plants. It is concluded that urea is helpful for better growth of S. nigrum under Cd stress. Thus, an optimum concentration of N-fertilizers might be effective in the phytoremediation of heavy metals through S. nigrum.
Arosha Maqbool; Shafaqat Ali; Muhammad Rizwan; Muhammad Saleem Arif; Tahira Yasmeen; Muhammad Riaz; Afzal Hussain; Shamaila Noreen; Mohamed M. Abdel-Daim; Saad Alkahtani. N-Fertilizer (Urea) Enhances the Phytoextraction of Cadmium through Solanum nigrum L. International Journal of Environmental Research and Public Health 2020, 17, 3850 .
AMA StyleArosha Maqbool, Shafaqat Ali, Muhammad Rizwan, Muhammad Saleem Arif, Tahira Yasmeen, Muhammad Riaz, Afzal Hussain, Shamaila Noreen, Mohamed M. Abdel-Daim, Saad Alkahtani. N-Fertilizer (Urea) Enhances the Phytoextraction of Cadmium through Solanum nigrum L. International Journal of Environmental Research and Public Health. 2020; 17 (11):3850.
Chicago/Turabian StyleArosha Maqbool; Shafaqat Ali; Muhammad Rizwan; Muhammad Saleem Arif; Tahira Yasmeen; Muhammad Riaz; Afzal Hussain; Shamaila Noreen; Mohamed M. Abdel-Daim; Saad Alkahtani. 2020. "N-Fertilizer (Urea) Enhances the Phytoextraction of Cadmium through Solanum nigrum L." International Journal of Environmental Research and Public Health 17, no. 11: 3850.
Diesel oil is considered a very hazardous fuel due to its adverse effect on the aquatic ecosystem, so its remediation has become the focus of much attention. Taking this into consideration, the current study was conducted to explore the synergistic applications of both plant and bacteria for cleaning up of diesel oil contaminated water. We examined that the application of floating treatment wetlands (FTWs) is an economical and superlative choice for the treatment of diesel oil contaminated water. In this study, a pilot scale floating treatment wetlands system having diesel oil contaminated water (1% w/v), was adopted using Cyperus laevigatus L and a mixture of hydrocarbons degrading bacterial strains; viz., Acinetobacter sp.61KJ620863, Bacillus megaterium 65 KF478214, and Acinetobacter sp.82 KF478231. It was observed that consortium of hydrocarbons degrading bacteria improved the remediation of diesel oil in combination with Cyperus laevigatus L. Moreover, the performance of the FTWs was enhanced by colonization of bacterial strains in the root and shoot of Cyperus laevigatus L. Independently, the bacterial consortium and Cyperus laevigatus L exhibited 37.46% and 56.57% reduction in diesel oil, respectively, while 73.48% reduction in hydrocarbons was exhibited by the joint application of both plant and bacteria in FTWs. Furthermore, microbial inoculation improved the fresh biomass (11.62%), dry biomass (33.33%), and height (18.05%) of plants. Fish toxicity assay evaluated the effectiveness of FTWs by showing the extent of improvement in the water quality to a level that became safe for living organisms. The study therefore concluded that Cyperus laevigatus L augmented with hydrocarbons degrading bacterial consortium exhibited a remarkable ability to decontaminate the diesel oil from water and could enhance the FTWs performance.
Muhammad Fahid; Shafaqat Ali; Ghulam Shabir; Sajid Rashid Ahmad; Tahira Yasmeen; Muhammad Afzal; Muhammad Arslan; Afzal Hussain; Abeer Hashem; Elsayed Fathi Abd Allah; Mohammed Nasser Alyemeni; Parvaiz Ahmad. Cyperus laevigatus L. Enhances Diesel Oil Remediation in Synergism with Bacterial Inoculation in Floating Treatment Wetlands. Sustainability 2020, 12, 2353 .
AMA StyleMuhammad Fahid, Shafaqat Ali, Ghulam Shabir, Sajid Rashid Ahmad, Tahira Yasmeen, Muhammad Afzal, Muhammad Arslan, Afzal Hussain, Abeer Hashem, Elsayed Fathi Abd Allah, Mohammed Nasser Alyemeni, Parvaiz Ahmad. Cyperus laevigatus L. Enhances Diesel Oil Remediation in Synergism with Bacterial Inoculation in Floating Treatment Wetlands. Sustainability. 2020; 12 (6):2353.
Chicago/Turabian StyleMuhammad Fahid; Shafaqat Ali; Ghulam Shabir; Sajid Rashid Ahmad; Tahira Yasmeen; Muhammad Afzal; Muhammad Arslan; Afzal Hussain; Abeer Hashem; Elsayed Fathi Abd Allah; Mohammed Nasser Alyemeni; Parvaiz Ahmad. 2020. "Cyperus laevigatus L. Enhances Diesel Oil Remediation in Synergism with Bacterial Inoculation in Floating Treatment Wetlands." Sustainability 12, no. 6: 2353.
Excessive use of nitrogenous fertilizers and their improper management in agriculture causes nitrate contamination of surface and groundwater resources. This study was conducted along the seasonally flooded alluvial agricultural area of Indus River Basin to determine the spatial and temporal dynamics of nitrate concentrations in the groundwater along the river. Total of 112 samples were collected from shallow (30–40 ft) and deep groundwater (120–150 ft) wells at seven sites, 25 km apart from each other and covered an area of 170 km along the river, during four sampling campaigns between October 2016 to May 2017 i.e. in start, mid and end of dry season. The study period covered the whole agricultural cycle including the wet summer season with no agricultural activities under flooding and the sampling sites were always less than 2 km from the river bank. Nitrate concentrations of shallow wells were 15–54 and 20–45 mg L−1 during the start and middle of dry season, respectively. However, at the end of the dry season, the highest nitrate concentrations of 35–75 mg L−1 were recorded and 70% of these samples contained nitrate concentrations above the permissible limit 50 mg L−1. Similar seasonal patterns of nitrate concentrations were observed in deep wells, however, δ18O data suggested lower recharge in deep well than shallow wells. The results illustrated that high nitrate concentrations in shallow wells were associated with high δ18O values indicating that the quantity of evaporated water infiltrated from the floodplain, possibly from distribution channels, along with the nitrate polluting shallow wells more than the deep wells. At the end of the dry season, nitrate concentrations exceeded the permissible limits in both shallow and deep wells, which possibly happened due to the horizontal movement of ground water along with the nitrate mixing during vertical seepage of river water to the aquifers.
Shahrukh Nawaz Khan; Tahira Yasmeen; Muhammad Riaz; Muhammad Saleem Arif; Muhammad Rizwan; Shafaqat Ali; Azeem Tariq; Søren Jessen. Spatio-temporal variations of shallow and deep well groundwater nitrate concentrations along the Indus River floodplain aquifer in Pakistan. Environmental Pollution 2019, 253, 384 -392.
AMA StyleShahrukh Nawaz Khan, Tahira Yasmeen, Muhammad Riaz, Muhammad Saleem Arif, Muhammad Rizwan, Shafaqat Ali, Azeem Tariq, Søren Jessen. Spatio-temporal variations of shallow and deep well groundwater nitrate concentrations along the Indus River floodplain aquifer in Pakistan. Environmental Pollution. 2019; 253 ():384-392.
Chicago/Turabian StyleShahrukh Nawaz Khan; Tahira Yasmeen; Muhammad Riaz; Muhammad Saleem Arif; Muhammad Rizwan; Shafaqat Ali; Azeem Tariq; Søren Jessen. 2019. "Spatio-temporal variations of shallow and deep well groundwater nitrate concentrations along the Indus River floodplain aquifer in Pakistan." Environmental Pollution 253, no. : 384-392.
Being a primary toxic heavy metal, lead (Pb) contamination presents an imposing environmental and public health concern worldwide. A Bacillus subtilis PbRB3, displaying higher Pb tolerance, was isolated from the textile effluent. The bacterial culture was able to remove >80% of Pb from culture solution. Upon screening in the presence of Pb, PbRB3 strain exhibited significant plant growth promoting potential. A 3 weeks long pot experiment was established to examine the capability of PbRB3 strain for physiological and biochemical traits, and Pb accumulation tendency of mung bean at 250 and 500 mg kg−1 of Pb toxicity, respectively. With respect to control treatments, photosynthetic pigments, protein synthesis, net assimilation rate, transpiration rate and stomatal conductance were significantly constrained by Pb toxicity levels. Intrinsic and instantaneous water use efficiencies were considerably improved in inoculated plants under Pb toxicity. Compared to inoculated control, significantly higher superoxide dismutase activity in both Pb toxicity treatments, while higher malondialdehyde contents only at Pb500 treatment was recorded with PbRB3 inoculation. Catalase activity between Pb250 and Pb500 treatments was comparable at both inoculation level. Moreover, PbRB3 inoculation led to significantly higher peroxidase activity under Pb toxicity treatments compared to inoculated control. The PbRB3 inoculation led to comparable differences in root Pb content between Pb250 and Pb500 treatments. These results suggest that inoculation of Pb tolerant, Bacillus subtilis PbRB3, could be employed to improve mung bean growth potential and adaptation against Pb toxicity, and thereby accelerated Pb rhizoaccumulation from metal contaminated environment.
Muhammad Saleem Arif; Tahira Yasmeen; Sher Muhammad Shahzad; Muhammad Riaz; Muhammad Rizwan; Shahid Iqbal; Muntaha Asif; Mona H. Soliman; Shafaqat Ali. Lead toxicity induced phytotoxic effects on mung bean can be relegated by lead tolerant Bacillus subtilis (PbRB3). Chemosphere 2019, 234, 70 -80.
AMA StyleMuhammad Saleem Arif, Tahira Yasmeen, Sher Muhammad Shahzad, Muhammad Riaz, Muhammad Rizwan, Shahid Iqbal, Muntaha Asif, Mona H. Soliman, Shafaqat Ali. Lead toxicity induced phytotoxic effects on mung bean can be relegated by lead tolerant Bacillus subtilis (PbRB3). Chemosphere. 2019; 234 ():70-80.
Chicago/Turabian StyleMuhammad Saleem Arif; Tahira Yasmeen; Sher Muhammad Shahzad; Muhammad Riaz; Muhammad Rizwan; Shahid Iqbal; Muntaha Asif; Mona H. Soliman; Shafaqat Ali. 2019. "Lead toxicity induced phytotoxic effects on mung bean can be relegated by lead tolerant Bacillus subtilis (PbRB3)." Chemosphere 234, no. : 70-80.
Heavy metal contamination of agricultural soil has become a serious global problem. This study was aimed to evaluate the effects of two chromium (Cr) tolerant plant growth promoting bacteria (PGPB) in combination with salicylic acid (SA) on plant growth, physiological, biochemical responses and heavy metal uptake under Cr contamination. A pot experiment (autoclaved sand as growing medium) was performed using maize (Zea mays L.) as a test crop under controlled conditions. Cr toxicity significantly reduced plant growth, photosynthetic pigment, carbohydrates metabolism and increased H2O2, MDA, relative membrane permeability, proline and Cr contents in maize leaves. However, inoculation with selected PGPB (T2Cr and CrP450) and SA application either alone or in combination alleviated the Cr toxicity and promoted plant growth by decreasing Cr accumulation, H2O2 and MDA level in maize. Furthermore, dual PGPB inoculation with SA application also improved plant performance under Cr-toxicity. Results obtained from this study indicate that PGPB inoculation and SA application enhanced Cr tolerance in maize seedlings by decreasing Cr uptake from root to shoot. Additionally, combination of both PGPB and SA also reduced oxidative stress by elevating the activities of enzymatic and non-enzymatic antioxidant, also indicated by improved carbohydrate metabolism in maize plant exposed to Cr contamination. Comparatively, alleviation effects were more pronounced in PGPB inoculated plants than SA applied plants alone. The results suggest that combined use of PGPB and SA application may be exploited for improving production potential of maize in metal (Cr) contaminated soil.
Faisal Islam; Tahira Yasmeen; Muhammad Saleem Arif; Muhammad Riaz; Sher Muhammad Shahzad; Qaiser Imran; Irfan Ali. Combined ability of chromium (Cr) tolerant plant growth promoting bacteria (PGPB) and salicylic acid (SA) in attenuation of chromium stress in maize plants. Plant Physiology and Biochemistry 2016, 108, 456 -467.
AMA StyleFaisal Islam, Tahira Yasmeen, Muhammad Saleem Arif, Muhammad Riaz, Sher Muhammad Shahzad, Qaiser Imran, Irfan Ali. Combined ability of chromium (Cr) tolerant plant growth promoting bacteria (PGPB) and salicylic acid (SA) in attenuation of chromium stress in maize plants. Plant Physiology and Biochemistry. 2016; 108 ():456-467.
Chicago/Turabian StyleFaisal Islam; Tahira Yasmeen; Muhammad Saleem Arif; Muhammad Riaz; Sher Muhammad Shahzad; Qaiser Imran; Irfan Ali. 2016. "Combined ability of chromium (Cr) tolerant plant growth promoting bacteria (PGPB) and salicylic acid (SA) in attenuation of chromium stress in maize plants." Plant Physiology and Biochemistry 108, no. : 456-467.
Salinity, a frequently occurring abiotic stress, is a major constraint for crop productivity worldwide. The present study was conducted to evaluate the ability of plant growth promoting rhizobacteria (PGPR) Bacillus cereus Pb25, isolated from soil irrigated with saline water, to promote Vigna radiate (mungbean) growth in the absence and presence of salt stress (9 dS m−1). Results demonstrated that B. cereus promoted V. radiate plant growth significantly even in the presence of salt. Inoculations with PGPR improved the plant growth, and increased the root, shoot fresh and dry biomass and yield as compared to plants with no bacterial treatment (control). Results showed that both chlorophyll content and plant growth were inhibited by saline stress and the salt-induced oxidative damage (measured by MDA, H2O2) was alleviated by PGPR inoculation. Furthermore, PGPR inoculation significantly increased the antioxidant enzymes (POD, SOD and CAT) activities and enhanced the accumulation of proline, potassium, nitrogen and phosphorus as well as decreased sodium accumulation in saline stressed plants. Regarding the soil biological activity, inoculated PGPR enhanced the activity of dehydrogenase, alkaline phosphatase, microbial biomass carbon, available phosphorus and total organic carbon under saline stress as compared to saline treatment alone. These results suggest that B. cereus can be used in salinized agricultural lands as bio-inoculant to increase crop productivity.
Faisal Islam; Tahira Yasmeen; Muhammad S. Arif; Shafaqat Ali; Basharat Ali; Sohail Hameed; Weijun Zhou. Plant growth promoting bacteria confer salt tolerance in Vigna radiata by up-regulating antioxidant defense and biological soil fertility. Plant Growth Regulation 2015, 80, 23 -36.
AMA StyleFaisal Islam, Tahira Yasmeen, Muhammad S. Arif, Shafaqat Ali, Basharat Ali, Sohail Hameed, Weijun Zhou. Plant growth promoting bacteria confer salt tolerance in Vigna radiata by up-regulating antioxidant defense and biological soil fertility. Plant Growth Regulation. 2015; 80 (1):23-36.
Chicago/Turabian StyleFaisal Islam; Tahira Yasmeen; Muhammad S. Arif; Shafaqat Ali; Basharat Ali; Sohail Hameed; Weijun Zhou. 2015. "Plant growth promoting bacteria confer salt tolerance in Vigna radiata by up-regulating antioxidant defense and biological soil fertility." Plant Growth Regulation 80, no. 1: 23-36.
For effective microbe-assisted bioremediation, metal-resistant plant growth-promoting bacteria (PGPB) must facilitate plant growth by restricting excess metal uptake in plants, leading to prevent its bio-amplification in the ecosystem. The aims of our study were to isolate and characterize copper (Cu)-resistant PGPB from waste water receiving contaminated soil. In addition, we investigated the phytotoxic effect of copper on the lentil plants inoculated with copper-resistant bacteria Providencia vermicola, grown in copper-contaminated soil. Copper-resistant P. vermicola showed multiple plant growth promoting characteristics, when used as a seed inoculant. It protected the lentil plants from copper toxicity with a considerable increase in root and shoot length, plant dry weight and leaf area. A notable increase in different gas exchange characteristics such as A, E, C i , g s , and A/E, as well as increase in N and P accumulation were also recorded in inoculated plants as compared to un-inoculated copper stressed plants. In addition, leaf chlorophyll content, root nodulation, number of pods, 1,000 seed weight were also higher in inoculated plants as compared with non-inoculated ones. Anti-oxidative defense mechanism improved significantly via elevated expression of reactive oxygen species -scavenging enzymes including ascorbate peroxidase, superoxide dismutase, catalase, and guaiacol peroxidase with alternate decrease in malondialdehyde and H2O2 contents, reduced electrolyte leakage, proline, and total phenolic contents suggesting that inoculation of P. vermicola triggered heavy metals stress-related defense pathways under copper stress. Overall, the results demonstrated that the P. vermicola seed inoculation confer heavy metal stress tolerance in lentil plant which can be used as a potent biotechnological tool to cope with the problems of copper pollution in crop plants for better yield.
Faisal Islam; Tahira Yasmeen; Qasim Ali; Muhammad Mubin; Shafaqat Ali; Muhammad Saleem Arif; Sabir Hussain; Muhammad Riaz; Farhat Abbas. Copper-resistant bacteria reduces oxidative stress and uptake of copper in lentil plants: potential for bacterial bioremediation. Environmental Science and Pollution Research 2015, 23, 220 -233.
AMA StyleFaisal Islam, Tahira Yasmeen, Qasim Ali, Muhammad Mubin, Shafaqat Ali, Muhammad Saleem Arif, Sabir Hussain, Muhammad Riaz, Farhat Abbas. Copper-resistant bacteria reduces oxidative stress and uptake of copper in lentil plants: potential for bacterial bioremediation. Environmental Science and Pollution Research. 2015; 23 (1):220-233.
Chicago/Turabian StyleFaisal Islam; Tahira Yasmeen; Qasim Ali; Muhammad Mubin; Shafaqat Ali; Muhammad Saleem Arif; Sabir Hussain; Muhammad Riaz; Farhat Abbas. 2015. "Copper-resistant bacteria reduces oxidative stress and uptake of copper in lentil plants: potential for bacterial bioremediation." Environmental Science and Pollution Research 23, no. 1: 220-233.
Wheat, a glycophyte grown in tropical and subtropical regions, is frequently being subjected to soil salinity ultimately affecting the plant growth and yield. Focus of the present study was to evaluate the ameliorative efficiency of different seed priming methods including hydropriming and halopriming [KCl and CaCl2 (100 mM)] by observing change in the expression of antioxidant defense system and accumulation of phenolic as well as proline in the spring wheat Lu26s (salt tolerant) and Lasani-06 (salt sensitive), grown under salt stress of 100 mM NaCl. Results showed that salt stress provoked a marked decline in germination, growth and yield parameters as well as increased lipid peroxidation and hydrogen peroxide (H2O2) contents. However, higher accumulation of proline and low H2O2 contents were recorded in both cultivars under halopriming followed by hydropriming. Halopriming induced a significant increase in antioxidant enzyme activities (CAT, POD, APX) of salt-tolerant cultivar Lu26s, whereas such pattern of enhanced activities of antioxidant enzymes in cultivar Lasani-06 was also found but the content of these activities was less than control under saline regime. The cultivar Lu26s (salt tolerant) maintained lower Na+ and higher K+/Na+ ratio in leaves than salt-sensitive cultivar Lasani-06. Reason behind the loss of grain yield under salinity was found due to the reduction in the grain spike−1 in cultivar Lasani-06, while, in cultivar Lu26s, it was due to decrease in the size of grains. Enhanced germination, low proline and Na+ contents stimulated antioxidant activities as well as phenolic contents associated with improved salt tolerance in haloprimed plants. These results suggest that halopriming is an efficient approach for imparting tolerance in wheat against salinity stress.
Faisal Islam; Tahira Yasmeen; Shafaqat Ali; Basharat Ali; Muhammad Ahsan Farooq; Rafaqat A. Gill. Priming-induced antioxidative responses in two wheat cultivars under saline stress. Acta Physiologiae Plantarum 2015, 37, 1 -12.
AMA StyleFaisal Islam, Tahira Yasmeen, Shafaqat Ali, Basharat Ali, Muhammad Ahsan Farooq, Rafaqat A. Gill. Priming-induced antioxidative responses in two wheat cultivars under saline stress. Acta Physiologiae Plantarum. 2015; 37 (8):1-12.
Chicago/Turabian StyleFaisal Islam; Tahira Yasmeen; Shafaqat Ali; Basharat Ali; Muhammad Ahsan Farooq; Rafaqat A. Gill. 2015. "Priming-induced antioxidative responses in two wheat cultivars under saline stress." Acta Physiologiae Plantarum 37, no. 8: 1-12.
Plant-associated bacteria can have beneficial effects on the growth and health of their host. However, the role of plant growth promoting bacteria (PGPR), under metal stress, has not been widely investigated. The present study investigated the possible mandatory role of plant growth promoting rhizobacteria in protecting plants from zinc (Zn) toxicity. The exposure of maize plants to 50µM zinc inhibited biomass production, decreased chlorophyll, total soluble protein and strongly increased accumulation of Zn in both root and shoot. Similarly, Zn enhanced hydrogen peroxide, electrolyte leakage and lipid peroxidation as indicated by malondaldehyde accumulation. Pre-soaking with novel Zn tolerant bacterial strain Proteus mirabilis (ZK1) isolated zinc (Zn) contaminated soil, alleviated the negative effect of Zn on growth and led to a decrease in oxidative injuries caused by Zn. Furthermore, strain ZK1 significantly enhanced the activities of catalase, guaiacol peroxidase, superoxide dismutase and ascorbic acid but lowered the Proline accumulation in Zn stressed plants. The results suggested that the inoculation of Zea mays plants with P. mirabilis during an earlier growth period could be related to its plant growth promoting activities and avoidance of cumulative damage upon exposure to Zn, thus reducing the negative consequences of oxidative stress caused by heavy metal toxicity.
Faisal Islam; Tahira Yasmeen; Muhammad Riaz; Muhammad Saleem Arif; Shafaqat Ali; Syed Hammad Raza. Proteus mirabilis alleviates zinc toxicity by preventing oxidative stress in maize (Zea mays) plants. Ecotoxicology and Environmental Safety 2014, 110, 143 -152.
AMA StyleFaisal Islam, Tahira Yasmeen, Muhammad Riaz, Muhammad Saleem Arif, Shafaqat Ali, Syed Hammad Raza. Proteus mirabilis alleviates zinc toxicity by preventing oxidative stress in maize (Zea mays) plants. Ecotoxicology and Environmental Safety. 2014; 110 ():143-152.
Chicago/Turabian StyleFaisal Islam; Tahira Yasmeen; Muhammad Riaz; Muhammad Saleem Arif; Shafaqat Ali; Syed Hammad Raza. 2014. "Proteus mirabilis alleviates zinc toxicity by preventing oxidative stress in maize (Zea mays) plants." Ecotoxicology and Environmental Safety 110, no. : 143-152.
Plant Growth Promoting Rhizobacteria (PGPR), whose role is still underestimated, plays an important (or perhaps essential) role in improving plant growth. The comprehensive understanding of bacterial plant growth promoting mechanism helps to get sustainable agriculture production under biotic and abiotic stresses. In the present study, plant growth promoting (PGP) bacterial strain Pseudomonas aeruginosa having maximum inhibitory concentration of 1500mg kg(-1) against Zn was isolated from arable land, irrigated with industrial effluent and evaluated to determine it bioremediation potential. The study was mainly focused on plant biomass production, nutrient uptake and oxidative stress tolerance in relation to the activities of antioxidative enzymes and the content of non-enzymatic antioxidants. The oxidative stress tolerance was measured by estimating the MDA accumulation as well as H2O2 production in wheat plants under Zn (1000mg kg(-1)) stress and inoculation of soil with Zn resistant Pseudomonas aeruginosa. Zn in rooting medium reduced the plant growth, leaf photosynthetic pigments as well as uptake of N and P. However, content of MDA and H2O2 increased at higher concentration of Zn. Inoculation of P. aeruginosa improved the uptake of P and N in wheat plants with an increase in leaf chlorophyll, total soluble protein and plant biomass production. Analysis of plant root and shoot disclosed that Zn concentration was significantly lowered in P. aeruginosa inoculated zinc stressed plants as compare to the plants grown under Zn stress only. The amelioration of adverse effects of Zn stress on biomass production due to P. aeruginosa inoculation was related with enhanced antioxidative enzyme activities (SOD, POD and CAT), and the contents of non-enzymatic components such as ascorbic acid and total phenolics (TPC) as compare to Zn-treated plants. The up-gradation in antioxidative defense mechanism, resulted a reduction in H2O2 and MDA content due to the scavenging of ROS by antioxidants. It was concluded that P. aeruginosa is an ideal candidate for bioremediation and wheat growth promotion against Zn-induced oxidative stress by improving the availability of necessary nutrient, eliciting antioxidant defense system as well as by lowering the Zn metal uptake.
Faisal Islam; Tahira Yasmeen; Qasim Ali; Shafaqat Ali; Muhammad Saleem Arif; Sabir Hussain; Hina Rizvi. Influence of Pseudomonas aeruginosa as PGPR on oxidative stress tolerance in wheat under Zn stress. Ecotoxicology and Environmental Safety 2014, 104, 285 -293.
AMA StyleFaisal Islam, Tahira Yasmeen, Qasim Ali, Shafaqat Ali, Muhammad Saleem Arif, Sabir Hussain, Hina Rizvi. Influence of Pseudomonas aeruginosa as PGPR on oxidative stress tolerance in wheat under Zn stress. Ecotoxicology and Environmental Safety. 2014; 104 ():285-293.
Chicago/Turabian StyleFaisal Islam; Tahira Yasmeen; Qasim Ali; Shafaqat Ali; Muhammad Saleem Arif; Sabir Hussain; Hina Rizvi. 2014. "Influence of Pseudomonas aeruginosa as PGPR on oxidative stress tolerance in wheat under Zn stress." Ecotoxicology and Environmental Safety 104, no. : 285-293.
Legumes as an important functional group of land plants are recognized to grow in water-deficient and low-nutrient environment because of their ability to form symbiosis with nitrogen fixing rhizobia and arbuscular mycorrhizal (AM) fungi, which improve nutrient acquisition from the soil and help plants to be well established. Aim of the present study was to evaluate the symbiotic potential of AM fungi, Glomus intraradices alone and/or in combination with two Bradyrhizobium japonicum strains MN-S and TAL-102 in Vigna radiata. Field experiment was conducted to investigate the influence of different microbial symbiotic associations on growth and yield of V. radiata. Dual inoculation of G. intraradices and both bacterial inoculants showed better potential of plant growth promotion over single inoculation of G. intraradices or bacterial inoculants. Both bacterial inoculants in combination with AM proved best with 3.78, 30.17 and 46.80 g plant−1 dry weight at 25, 45 and 90 days after sowing (DAS), respectively. Maximum grain yield of 1,506.87 kg ha−1 as well as phosphorus contents of 1.981 mg g−1 root, 3.830 mg g−1 shoot and 4.935 mg g−1 grain were observed with mix bacterial inoculants and AM at 90 DAS. The interactive effect of bacterial inoculants and AM was synergistically significant which improved the nitrogen contents by 68, 20 and 17% in root, shoot and grain, respectively, compared to uninoculated control at 90 DAS. The present study suggests the suitability of G. intraradices and B. japonicum having synergistic or additive interaction to be used as composite inoculum for enhancing crop production of V. radiata.
Tahira Yasmeen; Sohail Hameed; Mohsin Tariq; Shafaqat Ali. Significance of arbuscular mycorrhizal and bacterial symbionts in a tripartite association with Vigna radiata. Acta Physiologiae Plantarum 2012, 34, 1519 -1528.
AMA StyleTahira Yasmeen, Sohail Hameed, Mohsin Tariq, Shafaqat Ali. Significance of arbuscular mycorrhizal and bacterial symbionts in a tripartite association with Vigna radiata. Acta Physiologiae Plantarum. 2012; 34 (4):1519-1528.
Chicago/Turabian StyleTahira Yasmeen; Sohail Hameed; Mohsin Tariq; Shafaqat Ali. 2012. "Significance of arbuscular mycorrhizal and bacterial symbionts in a tripartite association with Vigna radiata." Acta Physiologiae Plantarum 34, no. 4: 1519-1528.