Effects of salt stress on ion balance,membrane lipid peroxidation,and osmotic regulation substance accumulation in thin skin muskmelon 'Huishu'
[Objective]To explore the physiological response mechanism of thin-skinned melon'Huishu'to salt(NaCl)stress and provide theoretical basis for melon cultivation,demonstration and promo-tion.[Methods]In this study,a substrate pot experiment was conducted to observe the changes in seedling growth,ion homeostasis,antioxidant enzyme system,and osmoregulation substances after 100 mmol/L NaCl short-term stress(5 d)and long-term stress(20 d).[Results]Salt stress inhibited seedling growth,de-stroyed ion balance and antioxidant systems.The plant height,petiole length,and leaf number decreased sig-nificantly with the prolongation of salt stress time,while the diameter,petiole diameter,and leaf thickness in-creased significantly with the prolongation of salt stress time.After salt stress,the Na+efflux velocity de-creased,the Na+content increased,the K+outflow velocity increased,and the K+content decreased.The content of malondialdehyde increased significantly.The content of malondialdehyde significantly increased,and the activities of SOD,POD,and CAT enzymes first increased and then decreased;the content of soluble sugar,soluble protein,and free proline increased significantly.[Conclusion]Under salt stress,the thin-skinned melon'Huishu'responds to salt stress by limiting its own growth,increasing the Na+content and re-ducing the K+content of its leaves,improving the antioxidant enzyme system,and accumulating more os-moregulation substances.
国家西甜瓜产业技术体系-特色甜瓜品种改良岗新疆农作物生物技术重点实验室开放课题新疆农业科学院科技创新重点培育专项新疆维吾尔自治区西甜瓜产业技术体系新疆维吾尔自治区天池英才项目Xinjiang Uygur Autonomous Region of watermelon and melon industry technology system-Deputy chiefXinjiang Uygur Autonomous Region Tianchi Talent Project
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