PJB-2025-351
Exogenous proline ameliorate the deleterious effects of salinity on the Simmondsia chinensisphysiology
Esmat F. Ali
Abstract
Jojoba (Simmondsia chinensis) has been identified as having elevated resistance to saline conditions, which may indicate their suitability for cultivation in desert areas for medical and industrial purposes. Because salt tolerance has been found to correlate with proline (Pro) aggregation under salt stress, one potential application of exogenous osmoprotectants such as Pro is to use it to counteract abiotic stress-induced adverse physiological effects on NaCl-stressed jojoba plants. This trial has been performedto assess the Pro mitigation impacts on the damage of salt stress on jojoba plants. Salt stresses at 5 and 10 dSm-1sodium chloride and proline treatments at 10 and 20 mM were applied in this experiment. Salt stress significantlydecreased membrane stability index (MSI) and stomatal conductance, especially at high levels, while exogenous application of Pro counteracted the undesirable impacts of salt according to these parameters relative to untreated control, with the 20 mM Pro treatment having the greater effect. Likewise, salt stress increased both malondialdehyde (MDA) and hydrogen peroxide (H2O2) production, but in Pro-treated plants these effects were reversed: accumulations of MDA and H2O2 were limited,hence the constancy of membrane was maintained and the salt stress injury was accordingly mitigated. Moreover, Pro accumulation as well as CAT and SOD enzyme activities,through activating the antioxidant machinery, were enhanced by Pro treatments. Therefore, it could be suggested that Pro can be an effective ameliorant of the negatively influences of salt stress on Jojoba growth, especially during its initial stages of growth.
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