Title: Effects of Exogenous Melatonin on Growth and Antioxidant System of Leaves in Cucumber Seedlings under Low Temperature and Weak Light Stress
Abstract: Cucumber cultivar‘Jinyou 4'was subjected to low temperature treatment of 18℃/10℃(day/night)in the artificial climate chamber.The effects of exogenous melatonin(MT)on the growth and antioxidant system of leaves in cucumber under low temperature and weak light stress were investigated.The results showed that:compared with the control treatment,exogenous MT treatment could significantly promote the increment of plant height,wall thickness,flesh weight,dry weight;the chlorophyll content and root activity increased by 13.3% and 18.8%,GSH content and ASA content by 39.3%and 24.7%,respectively and increased SOD,POD,CAT,APX,membrane H+-ATP activities,while reduced MDA content and electrolyte leakage by 28.7% and 29.7%in cucumber seedlings leaves under low temperature and weak light stress.So we can conclude that exogenous MT treatment could raise the activities of antioxidant enzymes and matter,membrane H+-ATP activities,decrease the membrane lipid peroxidation,maintain membrane integrity and function,and improve the adaptability of cucumber seedlings under low temperature and weak light stress,the 200μmol·L-1 MT treatment was better.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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