Effect of Salicylic acid, 24-Epibrassinolide and Jasmonic acid on morphological and yield attributes of Soybean plant

To meet the challenges resulting from biotic and abiotic stresses classical phytohormone have long been used in exploiting crop enhancement to the optimum level. Still there isdearth of informationregarding the physiological effectsof salicylic acid, brassinolide and jasmonic acid on seed qualities and yield of soybean. This investigation reports the effects of different concentration of SA (10-4 M, 10-5 M, 10-6 M), 24-EBL (10-5 M, 10-7 M, 10-9 M), JA (0.5 μM, 1.0 μM, 1.5 μM) on vegetative character and yield parameters of soybean. Foliar spray of SA, 24-EBL and JA was applied fifteen days before taking the sample and leaf samples were harvested at 45, 60, 75 DAS after sowing. Exogenous application of these PGR’s showed positive effect on plant growth by increasing the growth parameters (No. of branching/plant, No. of leaves/plant) and yield component of soybean during storage. From the results it was observed that SA at 10-6 M was found to be most significant and showed positive effect on growth parameters and yield component during vegetative and pod filling stage. SA at 10-6 M increased the no. of branching and leavesby about 68 & 37.5 % while 24-EBL (10-7 M) increased the same by about 56.8 & 27.2 % as compared with non-sprayed plants at 45 DAS. However, JA at all the three concentration almost gave non-significant effect on the studied parameters. Similarly application of SA (10-6 M) increased the no. of pods &seed weight by 37.0 & 56.8 % while 24-EBL (10-7 M) increased the same by about 29.8 & 20.8 % respectively. Foliar application of SA (10-4 M) and 24-EBL (10-5 M, 10-9 M) also showed increased growth and yield however best response was found tooccur at SA (10-6 M) & 24-EBL (10-7 M).