文献类型： 外文期刊
作者： Zhang, J. Z. 2 ; Zhang, Q. 1 ; Chen, Y. J. 1 ; Sun, L. L. 1 ; Song, L. Y. 1 ; Peng, C. L. 1 ;
作者机构： 1.S China Normal Univ, Guangdong Prov Key Lab Biotechnol Plant Dev, Key Lab Ecol & Environm Sci Guangdong Higher Educ, Coll Life Sci, Guangzhou 510631, Guangdong, Peoples R China
2.Guangxi Key Lab Biotechnol Crop Genet Improvement, Nanning 530007, Peoples R China
3.Guangxi Acad Agr Sci, Inst Biotechnol, Nanning 530
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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关键词：hydrogen peroxide: 7722-84-1;malondialdehyde: 542-78-9;superoxide dismutase: SOD;9054-89-1;EC 1.15.1.1;antioxidant enzyme;reactive oxygen species: ROS;7782-44-7;superoxide radical: 11062-77-4;ascorbate peroxidase: APX;72906-87-7;EC 1.11.1.11;catalase: CAT;9001-05-2;EC 1.11.1.6;DPPH;peroxidase: POD;9003-99-0;EC 1.11.1.7;photochemical efficiency;photosynthetic rate;enzyme activity;crop production;scavenging capability;photosynthesis performance;low temperature influence;cold-tolerance mechanism
