PJB-2022-235
Foliar application of ascorbic acid alleviated salinity and high temperature stresses on sorghum plants at the seedling stage
aboagla Mohammed
Abstract
Salinity and high temperature are the major abiotic stresses limiting sustainable crop production. The present study was conducted to investigate the effects of foliar exogenous ascorbic acid (ASA) application on sorghum seedling under different salinity levels (0, 50 and 100 mM Na2SO4) and temperature (25℃ and 37℃) stress. Five different levels of ASA (0, 142, 284,568, and 850 μΜ) were applied as a foliar application designed as N0, N1, N2, N3, and N4, respectively. Salinity and high temperature significantly reduced emergence percentage, shoot and root lengths, total fresh and dry weight, chlorophyll a and b content, and peroxidase (POD) activity. Superoxide dismutase (SOD) and malondialdehyde (MDA) content were increased with salinity and temperature stress. Under salinity stress at 100 mM Na2SO4, treatment with 850 Μμ ASA increased emergence percentage, shoot and root length, total fresh and dry weight, and chlorophyll a by 27.9%, 52.9%, 43.7% ,19.4%, 144.0%, 31.0%, respectively, and decreased MDA content by 38.5 % relative to the control (no treatment). At 37℃, 850 μΜ ASA increased emergence percentage, shoot length, total dry weight, and SOD activity by 9.0%, 24.7%, 228.4%, and 41.6%, respectively, relative to the control. Moreover, among all ASA levels used in this study, 850 μΜ ASA was most effective on most measured parameters. Our present study indicated that foliar application of ASA at an appropriate level could be an easy and sound strategy to alleviate the salinity and/or temperature stresses of sorghum seedlings.
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