PJB-2021-588
Gibberellic acid and ascorbic Acid Mitigates salt stress damage in some Sorghum (Sorghum bicolor L.) Varieties from China and Sudan
Aboagla Mohammed Ibrahim
Abstract
Salinity is one of major abiotic stresses limiting sustainable crop productivity, especially in arid and semi-arid regions. Seed priming might be a useful tool to improve emergence seedling, seedling growth and the antioxidant enzyme under salinity stress. This study was done to determine whether the gibberellic acid (GA3) at 288.7 μM GA3, ascorbic acid (ASA) at 850 μM ASA and their combination [288.7 μM GA3 + 850 μM ASA] could alleviate the negative effects of NaCl (0, 100 and 200 mM NaCl) on physiological attributes and antioxidative defense system of four sorghum varieties (Arfagdamk, Wadahmed, Yajin3180 and Yajin054). The results showed that high salinity stress significantly reduced emergence seedling percentage, shoot and root length, stem diameter, leaf area index, total dry weight, superoxide dismutase (SOD), peroxidase activity (POD), and chlorophyll a and b content. Moreover, salt treatment increased malondialdehyde content (MDA) and catalase activity (CAT). At the 200 Mm NaCl, GA3+ASA treatment increased shoot length by 52.4%, root length by 36.3%, stem diameter by 14.4%, leaf area index by 102.4%, total dry plant weight by 342.0%, SOD activity by 111.1%, CAT activity by 333.3% and APX activity by 414.0% as compared with non-primed seeds. Yajin3180 had a better emergence percentage, shoot and root length, leaf area index, total dry weight, SOD, POD, MDA and chlorophyll a than the other varieties. Our study suggested that combined application of GA3 and ASA was more effective than sole use of GA3 or ASA alone for improving parameters tested under salinity stress. Our study also suggested that Yajin3180 was more salt tolerant than the other sorghum varieties under salt conditions.
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