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Subject: Biochemistry × Author: Jakhar, Sonika × End date: 2023 × Start date: 2020 ×
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    ThesisItemOpen Access
    Effect of exogenous melatonin on cotton seed germination and seedling under saline condition
    (CCSHAU, Hisar, 2021-09) Jakhar, Sonika; Mandhania, Shiwani
    Cotton is an important fiber crop grown throughout the world and contributes significantly to global economy. Salinity is most destructive abiotic stress particularly at seed germination and seedling stage which considerably affects cotton productivity. Melatonin is regarded as a plant growth-promoting molecule and helps in mitigating several different abiotic stresses including salinity. Therefore, the present investigation was carried to study the effect of melatonin on seed germination and biochemical constituents in cotton under salinity stress. Results showed that salinity causes negative effects on cotton seed germination and decreases seed vigor. It also enhanced relative stress injury (in terms of electrolyte leakage), H2O2 and MDA content of seedlings by increasing membrane permeability to ions and solutes. Exogenous application of melatonin at the concentration of 20 μM has profound effect on seed germination, seedling vigor traits and antioxidant defense system in cotton under salinity soil. This indicates that seed priming with 20 μM melatonin mitigates the salinity effect and significantly improves cotton seed germination and vigor index traits. Melatonin might improve cotton germination under saline stress by mitigating the negative effect of oxidative stresses through elevating antioxidant defense system. This study provides an important information to improve cotton productivity in salt affected soil.