PJB-2021-563
ALLEVIATION OF SALINITY STRESS ON SORGHUM PLANTS VIA HUMIC ACID AND JASMONIC ACID APPLICATIONS
ADAM YOUSIF ADAM ALI
Abstract
Salinity stress is one of the most abiotic stress factors decreasing crop yield in many areas in the worldwide because many crops are sensitive to salinity. In this study, different humic acid rates at 0 (HA 0), 3 (HA 1), and 6 g HA kg-1 dry soil (HA 2) and different jasmonic acid levels, including 0 (JA0), 5 (JA1), and 10 mM JA (JA2), applied as a foliar application could alleviated the negative impacts of NaCl stress (0, 128.4 and 256.9 mM NaCl designed as S0, S1, and S2, respectively) on the sorghumplants. Chlorophyll content, nitrogen uptake, photosynthesis parameters, and leaf carbohydrates such as sugar content, starch content, and glucose content were measured. Forage sorghum plants applied to NaCl had a significant reduction in all traits tested except starch content. Under high salinity concentrations, JA2 increased the chlorophyll content, stomatal conductance, transpiration rate, sugar content, and nitrogen uptake by 18.1%, 25.9%, 110.1%, 36.0%, and 40.1%, respectively, while JA1 increased the starch content by 18.5% as compared with the control. At S2, HA2 increased the chlorophyll content by 18.87% and the transpiration rate by 45.45%. However, the rate of HA1 was increased photosynthesis rate by 21.53%, stomatal conductance by 23.41%, sugar content by 42.17%, and nitrogen content by 52.25% compared with the control at S2 (256.9 mM NaCl). Humic and jasmonic acids successfully alleviated the adverse impacts of salinity stress. JA1 level and HA1 were most influential on many of the attributes studied.
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