Abstract
This study was aimed to find the effects of 28-epibrassinolide (28-EBL) and HBL on pigeon pea seedlings subjected to drought stress, either alone and supplemented with 28-EBL and HBL treatments. Supplementation of EBL alone also exhibited the significant improvement on chlorophyll content (44.3% of Chl a and 54.3 % of Chl b) than EBL under drought stress treatments compared to the control plants. Control plants receiving the EBL alone treatment showed the significant effect (by 36%) than the EBL under stress treatment (19.78%) compared to the control for carotenoid levels. supplementation of EBL exhibited the significant improvement of PN (36%; 0.0411, p≤0.05) over their individuals in comparison to control. application of EBL under unstressed was more effective (45%; 0.0341, p≤0.05) over stressed control than their individual applications in enhancing gS in control plants. Plants treated with HBL alone showed a marked increase in Ci (by 25.1%) compared to control plants. application of HBL and was also effective (41.2%; 0.0265, p≤0.05) over unstressed control than their individual applications in enhancing E in control plants. application of EBL and HBL considerably increased the Fv/Fm and ФPSII in comparison to unstressed control. Control plants treated with EBL exhibited the impact on RuBPcase activity (43.1%; 0.0411, p≤0.05) over stressed control than their individual applications over the control plants. application of EBL was more effective (66.7%; 0.0237, p≤0.05) over unstressed control than their individual applications in enhancing FBPase activity in control plants. Control plants treated with EBL and HBL was found to be less effective on the PGK activity by 66.2% (0.0112, p≤0.05) than their individuals (EBL by 163.9%) compared to control. EBL and HBL has a more significant effect than their individual applications on the improvement of leaf starch and sucrose concentrations in drought stressed and well-watered plants.
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