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Prof. Dr. Ming Ma
Southwest university

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0 Forestry
0 Heavy Metals
0 Plants and microbes
0 Plants and climate
0 Plant ecology

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Original article
Published: 06 April 2021 in Plant, Cell & Environment
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The widespread ascomycetous fungus Diplodia pinea is a latent, necrotrophic pathogen in Pinus species causing severe damages and world‐wide economic losses. However, the interactions between pine hosts and virulent D. pinea are largely not understood. In the present study, systemic defense responses were investigated in non‐inoculated, asymptomatic needles and roots of D. pinea infected saplings of two P. sylvestris provenances under controlled greenhouse conditions. Here, we show that D. pinea infection induced a multitude of systemic responses of the phytohormone profiles and metabolic traits. Shared systemic responses of both pine provenances in needles and roots included increased abscisic acid and jasmonic acid levels. Exclusively in the roots of both provenances, enhanced salicylic acid and reduced indole‐3‐acetic acid levels, structural biomass, and elevated activities of anti‐oxidative enzymes were observed. Despite these similarities, the two pine provenances investigated different significantly in the systemic responses of both, phytohormone profiles and metabolic traits in needles and roots. However, the different systemic responses did not prevent subsequent destruction of non‐inoculated needles, but rather prevented damage to the roots. Our results provide a detailed view on systemic defence mechanisms of pine hosts that are of particular significance for the selection of provenances with improved defence capacity.

ACS Style

Bin Hu; Axel Mithöfer; Michael Reichelt; Kai Eggert; Franziska S. Peters; Ming Ma; Jörg Schumacher; Jürgen Kreuzwieser; Nicolaus von Wirén; Heinz Rennenberg. Systemic reprogramming of phytohormone profiles and metabolic traits by virulent Diplodia infection in its pine ( Pinus sylvestris L.) host. Plant, Cell & Environment 2021, 1 .

AMA Style

Bin Hu, Axel Mithöfer, Michael Reichelt, Kai Eggert, Franziska S. Peters, Ming Ma, Jörg Schumacher, Jürgen Kreuzwieser, Nicolaus von Wirén, Heinz Rennenberg. Systemic reprogramming of phytohormone profiles and metabolic traits by virulent Diplodia infection in its pine ( Pinus sylvestris L.) host. Plant, Cell & Environment. 2021; ():1.

Chicago/Turabian Style

Bin Hu; Axel Mithöfer; Michael Reichelt; Kai Eggert; Franziska S. Peters; Ming Ma; Jörg Schumacher; Jürgen Kreuzwieser; Nicolaus von Wirén; Heinz Rennenberg. 2021. "Systemic reprogramming of phytohormone profiles and metabolic traits by virulent Diplodia infection in its pine ( Pinus sylvestris L.) host." Plant, Cell & Environment , no. : 1.

Journal article
Published: 25 January 2021 in Chemosphere
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The identification of dominant microbes in anaerobic mercury (Hg) methylation, methylmercury (MeHg) demethylation, and methane oxidation as sulfate-reducing bacteria, methanogens or, probably, anaerobic methanotrophic archaea (ANMEs) is of great interest. To date, however, the interrelationship of bacteria and archaea involved in these processes remains unclear. Here, we demonstrated the dynamics of microorganisms participating in these processes. Anaerobic fixed-bed reactors were operated with swine manure and sludge to produce methane stably, and then, sulfate (reactor C), sulfate and Hg(II) (reactor H), and sulfate and MeHg (reactor M) were added, and the reactors were operated for 120 d, divided equally into four periods, P1–P4. The bacterial compositions changed nonsignificantly, whereas Methanosaeta in reactors H and M decreased significantly, revealing that it was irrelevant for Hg transformation. The abundances of Syntrophomonadaceae, Methanoculleus, Candidatus Methanogranum and Candidatus Methanoplasma increased continuously with time; these species probably functioned in these processes, but further evidence is needed. Desulfocella and Desulfobacterium dominated first but eventually almost vanished, while the dominant archaeal genera Methanogenium, Methanoculleus and Methanocorpusculum were closely related to ANME–1 and ANME–2. PLS-DA results indicated that both bacteria and archaea in different periods in the three reactors were clustered separately, implying that the microbial compositions in the same periods were similar and changed markedly with time.

ACS Style

Hongxia Du; Tao Sun; Yang Liu; Siwei An; Haiying Xie; Dingyong Wang; Yasuo Igarashi; Tadayuki Imanaka; Feng Luo; Ming Ma. Bacteria and archaea involved in anaerobic mercury methylation and methane oxidation in anaerobic sulfate–rich reactors. Chemosphere 2021, 274, 129773 .

AMA Style

Hongxia Du, Tao Sun, Yang Liu, Siwei An, Haiying Xie, Dingyong Wang, Yasuo Igarashi, Tadayuki Imanaka, Feng Luo, Ming Ma. Bacteria and archaea involved in anaerobic mercury methylation and methane oxidation in anaerobic sulfate–rich reactors. Chemosphere. 2021; 274 ():129773.

Chicago/Turabian Style

Hongxia Du; Tao Sun; Yang Liu; Siwei An; Haiying Xie; Dingyong Wang; Yasuo Igarashi; Tadayuki Imanaka; Feng Luo; Ming Ma. 2021. "Bacteria and archaea involved in anaerobic mercury methylation and methane oxidation in anaerobic sulfate–rich reactors." Chemosphere 274, no. : 129773.

Journal article
Published: 05 January 2021 in Environmental Pollution
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Rice has been confirmed as one of the principal intake pathways for methylmercury (MeHg) in human, however, the impact of edible organisms, such as snails, loaches and eels, living in the rice-based ecosystem to the overall MeHg intake has been overlooked. Here, we conducted a cross-sectional ecological study, and the results showed that bioaccumulation of MeHg in these edible organisms was significantly higher than in paddy soils and rice roots (p < 0.001), even though rice roots and grains have significantly higher total Hg (THg) (p < 0.001). The MeHg/THg ratios were consistently and significantly higher in those edible organisms than in rice grains, suggesting a potential elevated MeHg exposure risk through consumption. Based on results of bioaccumulation factors (BAFs) for MeHg, it was clear that MeHg was bioaccumulated and biotransformed from paddy soils to earthworms and then to eels, as well as from paddy soils to snails and then to eels and loaches, potentially indicating that the consumption of eels and loaches was absolutely pernicious to people regularly feeding on them. Overall, MeHg was biomagnified along the food chain of the paddy ecosystem from soil to the organisms, and it was of potential higher risks for local residents to eat them, especially eels and loaches. Therefore, it is intensely indispensable for people fond of such diets to attenuate their consumption of rice, eels and loaches, thus mitigating their MeHg exposure risks.

ACS Style

Hongxia Du; Pan Guo; Tao Wang; Ming Ma; Dingyong Wang. Significant bioaccumulation and biotransformation of methyl mercury by organisms in rice paddy ecosystems: A potential health risk to humans. Environmental Pollution 2021, 273, 116431 .

AMA Style

Hongxia Du, Pan Guo, Tao Wang, Ming Ma, Dingyong Wang. Significant bioaccumulation and biotransformation of methyl mercury by organisms in rice paddy ecosystems: A potential health risk to humans. Environmental Pollution. 2021; 273 ():116431.

Chicago/Turabian Style

Hongxia Du; Pan Guo; Tao Wang; Ming Ma; Dingyong Wang. 2021. "Significant bioaccumulation and biotransformation of methyl mercury by organisms in rice paddy ecosystems: A potential health risk to humans." Environmental Pollution 273, no. : 116431.

Journal article
Published: 12 November 2020 in Ecotoxicology and Environmental Safety
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This is a novel study about responses of leaf photosynthetic traits and plant mercury (Hg) accumulation of rice grown in Hg polluted soils to elevated CO2 (ECO2). The aim of this study was to provide basic information on the acclimation capacity of photosynthesis and Hg accumulation in rice grown in Hg polluted soil under ECO2 at day, night, and full day. For this purpose, we analyzed leaf photosynthetic traits of rice at flowering and grain filling. In addition, chlorophyll content, soluble sugar and Malondialdehyde (MDA) of rice leaves were measured at flowering. Seed yield, ear number, grain number per ear, 1000-grain weight, total mercury (THg) and methylmercury (MeHg) contents were determined after harvest. Our results showed that Hg polluted soil and ECO2 had no significant effect on leaf chlorophyll content and leaf mass per area (LMA) in rice. The contents of soluble sugar and MDA in leaves increased significantly under ECO2. Mercury polluted soil treatment significantly reduced the light saturated CO2 assimilation rate (Asat) of rice leaves only at flowering, but not at grain filling. Night ECO2 greatly improved rice leaf water use efficiency (WUE). ECO2 greatly increased seed yield and ear number. In addition, ECO2 did not affect THg accumulation in rice organs, but ECO2 and Hg treatment had a significant interaction on MeHg in seeds, husks and roots.

ACS Style

Qiaozhi Mao; Lingzhi Tang; Wenwen Ji; Heinz Rennenberg; Bin Hu; Ming Ma. Elevated CO2 and soil mercury stress affect photosynthetic characteristics and mercury accumulation of rice. Ecotoxicology and Environmental Safety 2020, 208, 111605 .

AMA Style

Qiaozhi Mao, Lingzhi Tang, Wenwen Ji, Heinz Rennenberg, Bin Hu, Ming Ma. Elevated CO2 and soil mercury stress affect photosynthetic characteristics and mercury accumulation of rice. Ecotoxicology and Environmental Safety. 2020; 208 ():111605.

Chicago/Turabian Style

Qiaozhi Mao; Lingzhi Tang; Wenwen Ji; Heinz Rennenberg; Bin Hu; Ming Ma. 2020. "Elevated CO2 and soil mercury stress affect photosynthetic characteristics and mercury accumulation of rice." Ecotoxicology and Environmental Safety 208, no. : 111605.

Journal article
Published: 15 October 2020 in Ecotoxicology and Environmental Safety
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It is of great importance to elucidate the mechanism of mercury (Hg) migration in the forest litterfall so as to clearly understand global Hg deposition. However, it is still unclear for the migration and transformation of Hg in different forest litters during long-term decomposition. Therefore, the dynamics of total Hg (THg), methylmercury (MeHg), carbon, nitrogen, microbial biomass carbon and nitrogen in the litterfall of the evergreen broadleaf (EB) and mixed broadleaf-conifer (MBC) forests, southwest China were investigated, aiming to understand the migration characteristics of Hg in the two-year decomposing litterfall. Results showed that carbon decreased, while nitrogen accumulated slightly in the process of litterfall decomposition. THg levels in the second year of the EB and MBC forests decreased by 16.9% and 11.3%, while MeHg levels reduced by 141.4% and 210.7% respectively comparing with those in the first year. The total percentage of hydrochloric acid-soluble mercury (Hg-h) and water-soluble mercury (Hg-w) had a significant impact on the migration of THg and MeHg in the two forest stands. The C/N ratio in the EB forest bore a positive correlation with THg and MeHg levels, whereas that in the MBC forest was adverse. Besides, microbial biomass C and N were positively related with THg and MeHg levels in both the EB and MBC forests. It is proposed that THg and MeHg accumulation in the second year drastically decreased probably due to finite nutritional conditions, which implies that Hg accumulation risks alleviate with degradation time.

ACS Style

Tao Wang; Guang Yang; Hongxia Du; Pan Guo; Tao Sun; Siwei An; Dingyong Wang; Ming Ma. Migration characteristics and potential determinants of mercury in long-term decomposing litterfall of two subtropical forests. Ecotoxicology and Environmental Safety 2020, 208, 111402 .

AMA Style

Tao Wang, Guang Yang, Hongxia Du, Pan Guo, Tao Sun, Siwei An, Dingyong Wang, Ming Ma. Migration characteristics and potential determinants of mercury in long-term decomposing litterfall of two subtropical forests. Ecotoxicology and Environmental Safety. 2020; 208 ():111402.

Chicago/Turabian Style

Tao Wang; Guang Yang; Hongxia Du; Pan Guo; Tao Sun; Siwei An; Dingyong Wang; Ming Ma. 2020. "Migration characteristics and potential determinants of mercury in long-term decomposing litterfall of two subtropical forests." Ecotoxicology and Environmental Safety 208, no. : 111402.

Journal article
Published: 04 October 2020 in Science of The Total Environment
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Methylmercury (MeHg) in rice is presumed to be derived from MeHg formed in the soil, although it is still controversial. Moderate soil mercury (Hg) concentration can affect the diversity of soil microorganisms and may also impact the physiological changes and MeHg absorption of rice. In this study, the pot experiment was conducted to explore the effects of Hg concentration gradients (0, 0.3, 3, and 30 mg kg−1) stress on Hg transformation in the rhizosphere, Hg translocation in rice, and physiological changes in rice leaves during the whole rice growing season. Moderate soil Hg concentration (3 mg kg−1) greatly increased the MeHg/THg (1.69%) of rhizosphere, while 30 mg kg−1 soil Hg concentration sharply reduced the MeHg/THg (0.29%) of rhizosphere. Highest MeHg/THg of the four groups all appeared at the blooming or filling stage. There was a significant positive correlation between Fe2+ in rhizosphere and MeHg/THg, but no significant correlation between SO42− and MeHg/THg was observed. Although the 3 mg kg−1 soil Hg concentration significantly enhanced MeHg concentrations in seeds, it considerably reduced the bioaccumulation factors of MeHg in roots, stalks, old leaves and young leaves. Soil Hg concentration of 30 mg kg−1, to a certain extent, curtailed MeHg concentrations in seeds, while MeHg concentrations in the husk were significantly increased. Consistent with the result that there was no significant difference for THg concentrations in old and young leaves among the four Hg treatment groups, the content of chlorophyll, H2O2, malondialdehyde and antioxidant substances, and the activities of antioxidant enzyme in old and young leaves varied indistinctly among groups. Moderate soil mercury concentration (3 mg kg−1) could extremely enhance MeHg production in the rhizosphere soil and its accumulation in rice; MeHg production in the rhizosphere soil increased greatly at the blooming or filling stage, whereas little effect on antioxidant systems in leaves was observed.

ACS Style

Pan Guo; Hongxia Du; Dingyong Wang; Ming Ma. Effects of mercury stress on methylmercury production in rice rhizosphere, methylmercury uptake in rice and physiological changes of leaves. Science of The Total Environment 2020, 765, 142682 .

AMA Style

Pan Guo, Hongxia Du, Dingyong Wang, Ming Ma. Effects of mercury stress on methylmercury production in rice rhizosphere, methylmercury uptake in rice and physiological changes of leaves. Science of The Total Environment. 2020; 765 ():142682.

Chicago/Turabian Style

Pan Guo; Hongxia Du; Dingyong Wang; Ming Ma. 2020. "Effects of mercury stress on methylmercury production in rice rhizosphere, methylmercury uptake in rice and physiological changes of leaves." Science of The Total Environment 765, no. : 142682.

Journal article
Published: 20 January 2020 in Ecotoxicology and Environmental Safety
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Soils in the water-level-fluctuating zone (WLFZ) of Three Gorges Reservoir (TGR) inundated by water for different periods of time are confirmed to have disparate characteristics to mercury (Hg), and thus it is of great significance to further investigate microbial compositions and influencing factors. The objective of this study was to compare bacterial and archaeal richness, α-diversities and compositions, as well as affecting variables, especially Hg concentrations, among soils under different submergence time—SI (inundated soil), SS (semi-inundated soil), SN(non-inundated soil) and SSe (sediment)—based on high throughput sequencing. Results showed that sediment had significantly higher bacterial and archaeal richness and α-diversities than the other soil types. Anaerolinea and Aeromonas, as well as Altiarchaeales, Nitrosoarchaeum, and Methanosarta were dominant in SSe, while sharply decreasing in the other soil types, with significant difference among groups. An unclassified genus in SCG critically predominating in SI, SS and SN, drastically reduced in SSe, with extremely significant difference among groups. Bathyarchaeota and Nitrososphaera, both dominating in SSe, decreased dramatically and almost vanished in SI and SN. All the variables except pH posed a significant positive effect on bacterial and archaeal compositions in SSe, while opposite effect in the other three soil types. MeHg and THg concentrations had relatively weaker effects on microbial compositions comparing to variables like NH4+, CEC, OM and SO42+.

ACS Style

Hongxia Du; Tao Sun; Dingyong Wang; Ma Ming. Bacterial and archaeal compositions and influencing factors in soils under different submergence time in a mercury-sensitive reservoir. Ecotoxicology and Environmental Safety 2020, 191, 110155 .

AMA Style

Hongxia Du, Tao Sun, Dingyong Wang, Ma Ming. Bacterial and archaeal compositions and influencing factors in soils under different submergence time in a mercury-sensitive reservoir. Ecotoxicology and Environmental Safety. 2020; 191 ():110155.

Chicago/Turabian Style

Hongxia Du; Tao Sun; Dingyong Wang; Ma Ming. 2020. "Bacterial and archaeal compositions and influencing factors in soils under different submergence time in a mercury-sensitive reservoir." Ecotoxicology and Environmental Safety 191, no. : 110155.

Journal article
Published: 22 November 2018 in International Journal of Environmental Research and Public Health
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Mercury (Hg) deposition in the forest ecosystem is a significant source of input for methyl Hg (MeHg) and total Hg (THg) to the subtropical forest field and downstream aquatic systems. Wet deposition, litterfall, runoff, and fluxes with forest soil percolate of MeHg and THg were sampled for two years in a watershed forest of southwest China. Results showed that the depositions of THg and MeHg through litterfall and throughfall were 86 µg m−2 yr−1 and 0.8 µg m−2 yr−1 respectively, with litterfall acting as a predominant route for the input of both THg and MeHg. The estimated fluxes of THg and MeHg in the throughfall and litterfall were 3 and 4 times greater than those in the precipitation. Methylmercury in the decomposed litter migrates during its erosion by surface runoff and the concentrations of MeHg were quite consistent with that in the surface runoff. Methylmercury mainly accumulated in the lower layer of the litter and upper layer of the soil (Oi), and its transfer through the soil cross-section was delayed. THg retention was not consistent with MeHg, probably with lower soil layers (Oe and Oa) storing and enriching THg in the forest ecosystem. The forest floor of the lower soil is an effective sink for THg but not for MeHg. Methylmercury accumulated in decomposing litter and upper soil layer might transfer with soil percolate, possessing potential ecological risks for residents living around the downstream aquatic systems.

ACS Style

Hongxia Du; Ming Ma; Tao Sun; Siwei An; Yasuo Igarashi; Dingyong Wang. Methyl and Total Mercury in Different Media and Associated Fluxes in a Watershed Forest, Southwest China. International Journal of Environmental Research and Public Health 2018, 15, 2618 .

AMA Style

Hongxia Du, Ming Ma, Tao Sun, Siwei An, Yasuo Igarashi, Dingyong Wang. Methyl and Total Mercury in Different Media and Associated Fluxes in a Watershed Forest, Southwest China. International Journal of Environmental Research and Public Health. 2018; 15 (12):2618.

Chicago/Turabian Style

Hongxia Du; Ming Ma; Tao Sun; Siwei An; Yasuo Igarashi; Dingyong Wang. 2018. "Methyl and Total Mercury in Different Media and Associated Fluxes in a Watershed Forest, Southwest China." International Journal of Environmental Research and Public Health 15, no. 12: 2618.

Journal article
Published: 19 January 2018 in Atmosphere
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In order to reveal the mercury (Hg) emission and exchange characteristics at the soil–air interface under different vegetation cover types, the evergreen broad-leaf forest, shrub forest, grass, and bare lands of Simian Mountain National Nature Reserve were selected as the sampling sites. The gaseous elementary mercury (GEM) fluxes at the soil–air interface under the four vegetation covers were continuously monitored for two years, and the effect of temperature and solar radiation on GEM fluxes were also investigated. Results showed that the GEM fluxes at the soil–air interface under different vegetation cover types had significant difference (p < 0.05). The bare land had the maximum GEM flux (15.32 ± 10.44 ng·m−2·h−1), followed by grass land (14.73 ± 18.84 ng·m−2·h−1), and shrub forest (12.83 ± 10.22 ng·m−2·h−1), and the evergreen broad-leaf forest had the lowest value (11.23 ± 11.13 ng·m−2·h−1). The GEM fluxes at the soil–air interface under different vegetation cover types showed similar regularity in seasonal variation, which mean that the GEM fluxes in summer were higher than that in winter. In addition, the GEM fluxes at the soil–air interface under the four vegetation covers in Mt. Simian had obvious diurnal variations.

ACS Style

Ming Ma; Tao Sun; Hongxia Du; Dingyong Wang. A Two-Year Study on Mercury Fluxes from the Soil under Different Vegetation Cover in a Subtropical Region, South China. Atmosphere 2018, 9, 30 .

AMA Style

Ming Ma, Tao Sun, Hongxia Du, Dingyong Wang. A Two-Year Study on Mercury Fluxes from the Soil under Different Vegetation Cover in a Subtropical Region, South China. Atmosphere. 2018; 9 (1):30.

Chicago/Turabian Style

Ming Ma; Tao Sun; Hongxia Du; Dingyong Wang. 2018. "A Two-Year Study on Mercury Fluxes from the Soil under Different Vegetation Cover in a Subtropical Region, South China." Atmosphere 9, no. 1: 30.