scholarly journals Influence of Plant Growth Regulators on Management of Barley Powdery Mildew under Salinity Stress

2013 ◽  
Vol 41 (2) ◽  
pp. 135-143
Author(s):  
Magdy El-Samman
Keyword(s):  
Powdery Mildew ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Salinity Stress ◽  
Growth Regulators ◽  
Barley Powdery Mildew

scholarly journals Regulation of physiological processes in winter wheat by growth regulators in conditions of powdery mildew infection

2019 ◽  
Vol 10 (3) ◽  
pp. 331-336
Author(s):  
Т. P. Mamenko ◽  
R. A. Yakymchuk
Keyword(s):  
Salicylic Acid ◽  
Antioxidant Enzymes ◽  
Powdery Mildew ◽  
Plant Growth ◽  
Winter Wheat ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Wheat Varieties ◽  
Physiological Processes ◽  
Winter Wheat Varieties

An important way of regulating the key units of metabolism in the plant organism under the action of stressors is the use of biologically active substances with regulating properties – plant growth regulators. They affect endogenous regulatory systems, altering key metabolic pathways and thus increasing the plant's sustainability and productive potential in adverse environmental conditions. The aim of the research was to establish the possibility of regulation of physiological processes in winter wheat varieties by exogenous treatment of plants with growth regulators of synthetic (salicylic acid) and natural (Emistim C and Biolan) origin to increase their resistance to the phytopathogen Erysiphe graminis DC f. sp. tritici Em. Marchal , the causative agent of powdery mildew. The intensity of the physiological processes in plants was evaluated by the dynamics of the activity of antioxidant enzymes – ascorbate peroxidase and catalase, the release of ethylene and the integrity of the cell membranes. The objects were selected varieties of soft winter wheat, which were grown in controlled growing conditions against the background of infection by powdery mildew. The treatment of plants was carried out using aqueous salicylic acid solutions in the concentration of 10–5 M (experimentally established by us), Emistim C and Biolan (manufacturer Agrobiotech) in the concentration specified by the manufacturer at the rate of 20 mL/ha, when the development of the disease reached 5% of the total natural background of the infection in the plants during the stages of heading-beginning of flowering. Infection of winter wheat with powdery mildew leads to disruption of cell membrane integrity, increased activity of catalase and ascorbate peroxidase in leaves of the susceptible winter wheat variety. The intensification of ethylene release by leaves of the resistant variety was observed, which was caused by the hypersensitive reaction of the hormone to the effect of stress. The use of plant treatment by growth regulators contributes to maintaining the integrity of membrane structures, adaptive changes in the activity of antioxidant enzymes and regulation of the synthesis of the stress hormone ethylene in both winter wheat varieties under stress. Such changes in the physiological processes induced by plant growth regulators are accompanied by the preservation of the grain productivity of winter wheat and the increase of their resistance to the development of the disease.

PGRs and nutrient consortium effect on water relations, photosynthesis, catalase enzyme and yield of blackgram under salinity stress

2019 ◽  
Author(s):  
R. Sivakumar and S. Jaya Priya
Keyword(s):  
Ascorbic Acid ◽  
Salicylic Acid ◽  
Plant Growth ◽  
Jasmonic Acid ◽  
Water Potential ◽  
Plant Growth Regulators ◽  
Salinity Stress ◽  
Growth Regulators ◽  
Chlorophyll Index ◽  
Benzyl Amino Purine

An experiment was conducted to study the effect of plant growth regulators namely jasmonic acid (50 µM), brassinolide (0.5 ppm), salicylic acid (100 ppm), ascorbic acid (100 ppm), gibberellic acid (10 ppm), benzyl amino purine (5 ppm) and nutrient consortium (K2SO4 (0.5%) + FeSO4 (0.5%) + Borax (0.3%) and TNAU Pulse Wonder (1%) on blackgram (Vigna mungo L.) variety TNAU (Blackgram) CO 6 under salinity condition. The salinity was imposed by 125 mM NaCl concentration in pot culture. Plant growth regulators and nutrient consortium were used as foliar spray at 20 and 40 days after sowing except jasmonic acid, which used as seed soaking. Under salinity stress, water potential, relative water content (RWC), photosynthetic rate, chlorophyll index and yield were significantly reduced as compared to control. Among the treatments, brassinolide and TNAU Pulse Wonder showed supremacy to enhance water potential, RWC and yield compared to other treatments. Salicylic acid performed better to stabilize the photosynthetic rate under salinity followed by TNAU Pulse Wonder. Benzyl amino purine had higher chlorophyll index than other treatments. Increased catalase activity was observed in brassinolide treated plants followed by salicylic acid and ascorbic acid under salinity.

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