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Leucas lavandulaefolia Sm. (Lamiaceae) is an important medicinal plant with a broad spectrum of pharmacological activities. This study aimed at characterizing the morphology, distribution, and chemical composition of the secretions of trichomes at different developmental stages on the leaves of L. lavandulaefolia, using light and electron microscopy. Morphological observations revealed the presence of bicellular non-glandular, glandular peltate, and capitate trichomes on both adaxial and abaxial leaf surfaces. The density of both non-glandular and glandular trichomes decreased with the progression of leaf development. Heads of peltate and short-stalked capitate trichomes were between 20.78–42.80 µm and 14.98–18.93 µm at different developmental stages. Furthermore, long-stalked capitate trichomes were rare and infrequent. Leaf sections revealed the presence of important secondary metabolites in glandular trichomes, i.e., terpenoids. This study represents the first report on the morphology and histochemistry of trichomes of L. lavandulaefolia; therefore, there is a great scope for further research in this field.
Yougasphree Naidoo; Thobekile Dladla; Yaser Hassan Dewir; Serisha Gangaram; Clarissa Marcelle Naidoo; Hail Z. Rihan. The Micromorphology and Histochemistry of Foliar Mixed Indumentum of Leucas lavandulaefolia (Lamiaceae). Plants 2021, 10, 1767 .
AMA StyleYougasphree Naidoo, Thobekile Dladla, Yaser Hassan Dewir, Serisha Gangaram, Clarissa Marcelle Naidoo, Hail Z. Rihan. The Micromorphology and Histochemistry of Foliar Mixed Indumentum of Leucas lavandulaefolia (Lamiaceae). Plants. 2021; 10 (9):1767.
Chicago/Turabian StyleYougasphree Naidoo; Thobekile Dladla; Yaser Hassan Dewir; Serisha Gangaram; Clarissa Marcelle Naidoo; Hail Z. Rihan. 2021. "The Micromorphology and Histochemistry of Foliar Mixed Indumentum of Leucas lavandulaefolia (Lamiaceae)." Plants 10, no. 9: 1767.
Light is a crucial element for plant growth and production. High-pressure sodium (HPS) lamps are considered not very electrically efficient as they generate high radiant heat, and as a consequence, there has been a lot of interest in replacing HPS lamps with new more efficient lighting sources in the form of light-emitting diodes (LEDs). LEDs have a linear photon output with the electrical input current, and this great feature allows the design of lighting arrays that match the plant’s needs. In the current study, light spectrum absorbance of pigments extracted from 14 plant species was analyzed. Two absorbance peaks were observed in the Photosynthetically Active Radiation (PAR) region: one at 435 nm and the other at 665 nm. The light spectrum array was designed to produce the spectrum absorbed by basil pigments. This included the use of new wavelengths of 435 ± 5 nm to cover the blue region. Moreover, the ratio between blue and red was considered to match the absorbance of basil pigment. The use of a light spectrum that matches the plant absorbance significantly improved the investigated physiological parameters and increased the growth yield of basil. Moreover, this is the first to confirm the great positive impact of using 435 nm light spectrum in comparison with the commercially widely used 450 nm LED spectrum. This investigation has great scientific and commercial applications in the field of indoor faming and plant factory systems.
Hail Z. Rihan; Mohammed Aldarkazali; Shiren J. Mohamed; Nancy B. McMulkin; Marwa H. Jbara; Michael P. Fuller. A Novel New Light Recipe Significantly Increases the Growth and Yield of Sweet Basil (Ocimum basilicum) Grown in Plant Factory System. Agronomy 2020, 10, 934 .
AMA StyleHail Z. Rihan, Mohammed Aldarkazali, Shiren J. Mohamed, Nancy B. McMulkin, Marwa H. Jbara, Michael P. Fuller. A Novel New Light Recipe Significantly Increases the Growth and Yield of Sweet Basil (Ocimum basilicum) Grown in Plant Factory System. Agronomy. 2020; 10 (7):934.
Chicago/Turabian StyleHail Z. Rihan; Mohammed Aldarkazali; Shiren J. Mohamed; Nancy B. McMulkin; Marwa H. Jbara; Michael P. Fuller. 2020. "A Novel New Light Recipe Significantly Increases the Growth and Yield of Sweet Basil (Ocimum basilicum) Grown in Plant Factory System." Agronomy 10, no. 7: 934.
Light is a crucial element for plant growth and production. In areas where natural light is not sufficient for optimal plant growth and production, high pressure sodium (HPS) light sources are widely used. However, HPS lamps are considered not very electrically efficient generating high radiant heat and as a consequence, there has been a lot of interest in replacing HPS lamps with new more efficient lighting sources in the form of light-emitting diodes (LEDs). The effects of three lighting sources (White LED, Blue/Red LED and HPS) on the growth, development and on the essential oil yield and quality of sweet basil and bush basil were investigated. There was a clear advantage to the Blue/Red (452 nm and 632 nm, respectively) LED on virtually all growth and physiological parameters measured for both basil species. The HPS lighting system always performed least effectively in all comparisons. Combining increases in plant yield and increases in oil yield the Blue/Red LED array outperformed the HPS lights by a factor of approximately double, with the white LED being intermediate between these two extremes.
Mohammed Aldarkazali; Hail Z. Rihan; Demelza Carne; Michael P. Fuller. The Growth and Development of Sweet Basil (Ocimum basilicum) and Bush Basil (Ocimum minimum) Grown under Three Light Regimes in a Controlled Environment. Agronomy 2019, 9, 743 .
AMA StyleMohammed Aldarkazali, Hail Z. Rihan, Demelza Carne, Michael P. Fuller. The Growth and Development of Sweet Basil (Ocimum basilicum) and Bush Basil (Ocimum minimum) Grown under Three Light Regimes in a Controlled Environment. Agronomy. 2019; 9 (11):743.
Chicago/Turabian StyleMohammed Aldarkazali; Hail Z. Rihan; Demelza Carne; Michael P. Fuller. 2019. "The Growth and Development of Sweet Basil (Ocimum basilicum) and Bush Basil (Ocimum minimum) Grown under Three Light Regimes in a Controlled Environment." Agronomy 9, no. 11: 743.
Hail Z Rihan. The Relationship between Yield Parameters and Morphological Characters for Barley: Evaluating linear and Non-linear models. Agricultural Research & Technology: Open Access Journal 2018, 14, 1 .
AMA StyleHail Z Rihan. The Relationship between Yield Parameters and Morphological Characters for Barley: Evaluating linear and Non-linear models. Agricultural Research & Technology: Open Access Journal. 2018; 14 (1):1.
Chicago/Turabian StyleHail Z Rihan. 2018. "The Relationship between Yield Parameters and Morphological Characters for Barley: Evaluating linear and Non-linear models." Agricultural Research & Technology: Open Access Journal 14, no. 1: 1.
Artificial seeds are artificially encapsulated somatic embryos (usually) or other vegetative parts such as shoot buds, cell aggregates, auxiliary buds, or any other micropropagules which can be sown as a seed and converted into a plant under in vitro or in vivo conditions. An improved artificial seed production technique is considered a valuable alternate technology of propagation in many commercially important crops and a significant method for mass propagation of elite plant genotypes. The production of plant clones multiplied by tissue culture and distributed as artificial seeds could be a useful alternative to the costly F1 hybrids for different plant crops. The delivery of artificial seeds also facilitates issues such as undertaking several ways for scaling up in vitro cultures and acclimatization to ex vitro conditions. The development of an artificial seed technique also provides a great approach for the improvement of various plant species such as trees and crops.
Hail Z. Rihan; Fakhriya Kareem; Mohammed E. El-Mahrouk; Michael P. Fuller. Artificial Seeds (Principle, Aspects and Applications). Agronomy 2017, 7, 71 .
AMA StyleHail Z. Rihan, Fakhriya Kareem, Mohammed E. El-Mahrouk, Michael P. Fuller. Artificial Seeds (Principle, Aspects and Applications). Agronomy. 2017; 7 (4):71.
Chicago/Turabian StyleHail Z. Rihan; Fakhriya Kareem; Mohammed E. El-Mahrouk; Michael P. Fuller. 2017. "Artificial Seeds (Principle, Aspects and Applications)." Agronomy 7, no. 4: 71.
Hail Rihan. The Effect of Exogenous Applications of Salicylic Acid and Molybdenum on the Tolerance of Drought in Wheat. Agricultural Research & Technology: Open Access Journal 2017, 9, 1 .
AMA StyleHail Rihan. The Effect of Exogenous Applications of Salicylic Acid and Molybdenum on the Tolerance of Drought in Wheat. Agricultural Research & Technology: Open Access Journal. 2017; 9 (4):1.
Chicago/Turabian StyleHail Rihan. 2017. "The Effect of Exogenous Applications of Salicylic Acid and Molybdenum on the Tolerance of Drought in Wheat." Agricultural Research & Technology: Open Access Journal 9, no. 4: 1.
The development stages of conventional cauliflower seeds were studied and the accumulation of dehydrin proteins through the maturation stages was investigated with the aim of identifying methods to improve the viability of artificial seeds of cauliflower. While carbohydrate, ash and lipids increased throughout the development of cauliflower traditional seeds, proteins increased with the development of seed and reached the maximum level after 75 days of pollination, however, the level of protein started to decrease after that. A significant increase in the accumulation of small size dehydrin proteins (12, 17, 26 KDa) was observed during the development of cauliflower seeds. Several experiments were conducted in order to increase the accumulation of important dehydrin proteins in cauliflower microshoots (artificial seeds). Mannitol and ABA (Absisic acid) increased the accumulation of dehydrins in cauliflower microshoots while cold acclimation did not have a significant impact on the accumulation of these proteins. Molybdenum treatments had a negative impact on dehydrin accumulation. Dehydrins have an important role in the drought tolerance of seeds and, therefore, the current research helps to improve the accumulation of these proteins in cauliflower artificial seeds. This in turns improves the quality of these artificial seeds. The current results suggest that dehydrins do not play an important role in cold tolerance of cauliflower artificial seeds. This study could have an important role in improving the understanding of the molecular mechanism of abiotic stress tolerance in plants.
Hail Z. Rihan; Mohammed Al-Issawi; Michael P. Fuller. An analysis of the development of cauliflower seed as a model to improve the molecular mechanism of abiotic stress tolerance in cauliflower artificial seeds. Plant Physiology and Biochemistry 2017, 116, 91 -105.
AMA StyleHail Z. Rihan, Mohammed Al-Issawi, Michael P. Fuller. An analysis of the development of cauliflower seed as a model to improve the molecular mechanism of abiotic stress tolerance in cauliflower artificial seeds. Plant Physiology and Biochemistry. 2017; 116 ():91-105.
Chicago/Turabian StyleHail Z. Rihan; Mohammed Al-Issawi; Michael P. Fuller. 2017. "An analysis of the development of cauliflower seed as a model to improve the molecular mechanism of abiotic stress tolerance in cauliflower artificial seeds." Plant Physiology and Biochemistry 116, no. : 91-105.