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题名: Carbon monoxide enhances the chilling tolerance of recalcitrant Baccaurea ramiflora seeds via nitric oxide-mediated glutathione homeostasis
作者: Bai, Xue-gui1, 2; Chen, Jin-hui3; Kong, Xiang-xiang1, 2; Todd, Christopher D.4; Yang Yongping(杨永平)1; Hu, Xiang-yang1, 2; null(李德铢)1, 2
刊名: FREE RADICAL BIOLOGY AND MEDICINE
关键词: Baccaurea ramiflora ; Carbon monoxide ; Glutathione ; Nitric oxide ; Reactive oxygen species ; Free radicals
英文摘要: Both carbon monoxide (CO) and nitric oxide (NO) play fundamental roles in plant responses to environmental stress. Glutathione (GSH) homeostasis through the glutathione-ascorbate cycle regulates the cellular redox status and protects the plant from damage due to reactive oxygen species (ROS) or reactive nitrogen species (RNS). Most recalcitrant seeds are sensitive to chilling stress, but the roles of and cross talk among CO, NO, ROS, and GSH in recalcitrant seeds under low temperature are not well understood. Here, we report that the germination of recalcitrant Baccaurea ramiflora seeds shows sensitivity to chilling stress, but application of exogenous CO or NO markedly increased GSH accumulation, enhanced the activities of antioxidant enzymes involved in the glutathione-ascorbate cycle, decreased the content of H2O2 and RNS, and improved the tolerance of seeds to low-temperature stress. Compared to orthodox seeds such as maize, only transient accumulation of CO and NO was induced and only a moderate increase in GSH was shown in the recalcitrant B. ramiflora seeds. Exogenous CO or NO treatment further increased the GSH accumulation and S-nitrosoglutathione reductase (GSNOR) activity in B. ramiflora seeds under chilling stress. In contrast, suppressing CO or NO generation, removing GSH, or blocking GSNOR activity resulted in increases in ROS and RNS and impaired the germination of CO- or NO-induced seeds under chilling stress. Based on these results, we propose that CO acts as a novel regulator to improve the tolerance of recalcitrant seeds to low temperatures through NO-mediated glutathione homeostasis. (c) 2012 Elsevier Inc. All rights reserved.
出版日期: 2012-08-15
卷号: 53, 期号:4, 页码:710-720
语种: 英语
收录类别: SCI
ISSN号: 0891-5849
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/15792
Appears in Collections:中国科学院青藏高原研究所昆明部_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650201, Yunnan, Peoples R China
2.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Kunming 650201, Yunnan, Peoples R China
3.Nanjing Forestry Univ, Key Lab Forest Genet & Biotechnol, Nanjing 210037, Jiangsu, Peoples R China
4.Univ Saskatchewan, Dept Biol, Saskatoon, SK S7N 5E2, Canada

Recommended Citation:
Bai, Xue-gui; Chen, Jin-hui; Kong, Xiang-xiang; Todd, Christopher D.; Yang, Yong-ping; Hu, Xiang-yang; Li, De-zhu.Carbon monoxide enhances the chilling tolerance of recalcitrant Baccaurea ramiflora seeds via nitric oxide-mediated glutathione homeostasis,FREE RADICAL BIOLOGY AND MEDICINE,2012,53(4):710-720
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