Amelioration of salinity stress by foliar application of salicylic acid and thiourea on mustard (Brassica juncea) genotypes and its effects on morphological and biochemical parameters.
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2022
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Department of Genetics and Plant Breeding, Banaras Hindu University, Varanasi.
Abstract
In the prevailing study, the capacity ofCS-54, RH749 and Girirajcultivars of Brassica juncea was investigated for their differential antioxidant defense mechanism to counter the salinity induced oxidative stress. The seedlingshandled with two different levels of NaCl (100mM and 200mM) to assess the effect of exogenously applied Salicylic acid (0.5mM and 1mM SA) and thiourea (3.5mM and 7mM TU) that resulted changes in metabolite content, are examined. Further, salinity prompted variations in leaf superoxide dismutase, catalase, Guaiacol peroxidase, ascorbate peroxidase, in all 3 cultivars were additionally investigated. Foliar application of Salicylic acidand thiourea accelerated shoot and root fresh and dry weights, shoot and root lengths, number of seeds per plant, number of leaves etc. Production of MDA turned into much higher in sensitive cultivar Giriraj. Proline content enhanced in all cultivars with greater pronounced impact on tolerant cultivar CS54 and RH749. The salt tolerant cultivar exhibited huge boom in the enzymatic activities. However, this salinity was significantly attenuated in tolerant cultivarby using exogenous SA and TU in contrast to Giriraj. These effects recommend that cultivar CS-54 and RH749 exhibit better defensive mechanism towards oxidative damage by alleviating salinity with exogenous SA and maintaining better levels of antioxidant enzymes in comparison to salt sensitive cultivar. CS54 and RH749 were superior in most of the physio-chemical attributes under both stressed and non-stressed condition as well as in exogenously applied level of mitigations. Overall, 1mM Salicylic acid proved effective in attenuating adverse effect of salt stress in Brassica juncea.
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CS54