The alternative pathway in cucumber seedlings under low temperature stress was enhanced by salicylic acid |
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Authors: | Tao Lei Hong Feng Xin Sun Qi-Lin Dai Fan Zhang Hou-Guo Liang Hong-Hui Lin |
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Institution: | (1) Key Laboratory of Bio-Resources and Eco-Environment (Ministry of Education), College of Life Sciences, Sichuan University, 610064 Chengdu, Sichuan, People’s Republic of China;(2) Sichuan College of Education, 610041 Chengdu, Sichuan, People’s Republic of China;(3) State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, 610065 Chengdu, Sichuan, People’s Republic of China; |
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Abstract: | The alternative pathway is a cyanide-resistant and non-phosphorylatory electron transport pathway in mitochondria of higher
plants. Alternative oxidase (AOX) is the terminal oxidase of this pathway. Our present study investigated the effect of exogenous
salicylic acid (SA) on alternative pathway in cucumber (Cucumis sativus L.) seedlings under low temperature stress. Results showed that during the process of low temperature stress, the alternative
pathway capacity was enhanced as AOX expression increased in SA pretreated seedlings. Compared with seedlings without SA pretreatment,
slower decrease of relative water content and lower levels of electrolyte leakage, H2O2 and malonyldialdehyde content were detected in SA pretreated seedlings. These results indicated that SA could alleviate the
injury caused by low temperature on cucumber seedlings. Since the special protective functions of alternative pathway and
AOX in plants, we suggested that the alternative pathway was related to SA-mediated plant resistance to environmental stresses
such as low temperature. |
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