Improved tolerance toward low temperature in banana (Musa AAA Group Cavendish Williams)
文献类型: 外文期刊
第一作者: Chen, Y. J.
作者: Chen, Y. J.;Sun, L. L.;Song, L. Y.;Peng, C. L.;Zhang, J. Z.;Zhang, J. Z.
作者机构:
关键词: Ascorbate peroxidase;Banana;Catalase;Peroxidase;Photosynthesis;Reactive oxygen species;Superoxide dismutase
期刊名称:SOUTH AFRICAN JOURNAL OF BOTANY ( 影响因子:2.315; 五年影响因子:2.71 )
ISSN: 0254-6299
年卷期: 2012 年 78 卷
页码:
收录情况: SCI
摘要: To further understand the physiological mechanisms of cold-tolerance in banana plants, the responses of four introducing cultivars (cv.) W811 (via long-term cold adaptation), PB, BJ10 and BJ11 to low-temperature stress (LT) were investigated. LT caused increased malondialdehyde (MDA) content, elevated contents of hydrogen peroxide (H2O2) and superoxide radical (O-2 center dot(-)), and decreased photochemical efficiency (F-v/F-m) and net photosynthetic rate (P-n) in the leaves of four banana cultivars, but cv. W811 showed better LT tolerance than the other three cultivars. After 72 h of LT, four key antioxidative enzymes in the four cultivars showed different responses. Compared to controls, superoxide dismutase (SOD) activities in the four cultivars showed a significant decrease and W811 had the smallest amount of decrease. Catalase (CAT) activities showed a significant decrease. Peroxidase (POD) activities kept relatively higher activities and showed no significant changes (P>0.05) in W811, BJ10 and BJ11 whereas that in PB showed a significant increase (P < 0.001). Ascorbate peroxidase (APX) activities in W811 and PB showed no significant changes (P>0.05). Our results showed that higher cold-tolerance in cv. W811 may correlate with the long-term cold adaptation of the antioxidative enzymes such as SOD, POD and APX that alleviate oxidative stress caused by LT. (C) 2011 SAAB. Published by Elsevier B.V. All rights reserved.
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