PJB-2020-148
THE ROLE OF GIBBERELLIC ACID ON ALLEVIATING SALT STRESS ON SORGHUM (SORGHUM BICOLOR L. MOENCH)
Nimir Eltyb Ahmed Nimir
Abstract
Salinity as abiotic stress substantially causes decline on productivity of field crops worldwide. Sorghum as main food for huge population of people in Africa and Asia in large areas is faces the negative effect of salt stress. Many techniques were tested to mitigate the effect of salt stress on sorghum from germination to reproductive stage, however seed priming during seed germination and /or foliar application during vegetative growth by GA3 were the best techniques to enhance the seedling growth, plant establishment and yield productivity. Different plant stages have different response to interaction between GA3 and salinity stress. Early seedling growth is more sensitive to salinity than the other plant stages, therefore is higher responses to GA3 application especially by seed soaking method. Salinity stress increased reactive oxygen species and disturb the membrane permeability and ultimately led to ions toxicity in cytoplasm, all these physiological observations are mitigated by applying GA3 hormone. Stimulate the antioxidant defense system and increased dry matter accumulation and grain yield productivity also achieved when sorghum plant is treated by GA3. Also many texts indicated that exogenous GA3 improved protein content, mitigated the negative effect of some toxic ions and enhance endogenous hormones concentrations. Seed soaking in appropriate GA3 concentration is recommended to enhanced germination of sorghum seed, where foliar application by GA3 is recommended to improve growth and yield of sorghum under salinity stress condition.
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