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Subject: Botany × Author: Prakriti ×
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    ThesisItemOpen Access
    Efficacy of jasmonic acid on morpho-physiological, biochemical and quality attributes of sorghum (Sorghum bicolor L.) under salt stress
    (CCS HAU, Hisar, 2022-07-16) Prakriti; Sridevi Tallapragada
    The present study entitled “Efficacy of jasmonic acid on morpho-physiological, biochemical and quality attributes of sorghum (Sorghum bicolor L.) under salt stress” was investigated in the screen house during the kharif season of 2021. Before sowing, the desired levels of salt stress (control, 5, 7.5 and 8 dS m-1) were maintained by saturating each pot. Seeds of Sorghum bicolor L. were grown in pots under screen house conditions on 16th July 2021. Jasmonic acid (4.5, 6.5 and 8.5 mM) was applied exogenously after 30 days after sowing (DAS) under stressed as well as non-stressed plants in both genotypes (HJ 541 and CSV 21F). Sampling was done at 40 and 60 DAS. Growth parameters decreased with increasing levels of salt stress, whereas foliar application of jasmonic acid enhanced the growth of plants. Similarly, anatomical parameters of leaf were enhanced after the application of jasmonic acid which were negatively affected by salt stress. Plant water relation, gaseous exchange studies, chlorophyll index and photochemical quantum yield also showed declining trend from control to 8 dS m-1 of salt level in both genotypes, but more percent decrease was observed at 8 dS m-1 of salt stress like in ψw (46.66%), ψs (18.27), photosynthetic rate (31.80%), transpiration rate (14.60%) and stomatal conductance (44.41%) in HJ 541, over their respective control. The values ranged from 7.32 to 6.66, 27.37 to 23.32 and 54.51 to 50.83 in protein, fibre and in-vitro dry matter digestibility, respectively, at 8 dS m-1 of salt stress in CSV 21F at 40 DAS. Application of JA help in the maintenance of plant water status, enhanced the exchange of gases and chlorophyll index irrespective of salt stress in both genotypes. Reversibily, electrolyte leakage and ash content enhanced with every increment of salt stress but application of JA ameliorate the adverse effect of salt stress to some extent. Increment in Na+ but a decrease in K+ and Ca2+ content was noted under salt stress. While, the reverse trend was noticed after application of JA. In nut shell, sorghum genotypes CSV 21F and HJ 541 performed better under salt stress and showed better response in alleviating salt stress with foliar application of 8.5 mM jasmonic acid.