Responses of photosynthesis, lipid peroxidation and antioxidant system in leaves of Quercus mongolica to elevated O-3

doi:10.1016/j.envexpbot.2010.03.008

	Responses of photosynthesis, lipid peroxidation and antioxidant system in leaves of Quercus mongolica to elevated O-3
	Yan, Kun 1,2; Chen, Wei 1; He, Xingyuan 1; Zhang, Guoyou 1,2; Xu, Sheng 1; Wang, Lanlan 3
刊名	ENVIRONMENTAL AND EXPERIMENTAL BOTANY
	2010-11-01
卷号	69 期号:2 页码:198-204
关键词	Chlorophyll Electrolyte Leakage Open Top Chamber Senescence
ISSN号	0098-8472
DOI	10.1016/j.envexpbot.2010.03.008
英文摘要	Quercus mongolica Fisch. ex Ledeb. is an economically and ecologically important oak species mainly distributed in East Asia. Our study suggested that it was susceptible to elevated O-3. Using open top chambers, changes in photosynthesis, lipid peroxidation and antioxidant system were studied in Q mongolica leaves fumigated with elevated O-3 (approximate to 80 nmol mol(-1)). During the O-3 exposure, photosynthetic rate (Pn) and stomatal conductance decreased significantly, but the decrease in Pn hardly resulted from the stomatal limitation, as no decrease was observed in the intercellular CO2 concentration. In addition, significant decrease was noted in carboxylation efficiency, indicating that the CO2 fixation process was affected by O-3, and it can be taken as the main factor leading to the decline of Pn, particularly in the initial 45 days of O-3 fumigation. In the initial 45 days of O-3 fumigation, ascorbate (Asc) content and activities of superoxide dismutase and ascorbate peroxidase were enhanced, but the enhanced antioxidant capability did not balance reactive oxygen species production, resulting in significant increase in malondialdehyde content at day 45. In the following O-3 fumigation period, significant decrease in activities of antioxidant enzymes and Asc content were recorded in the leaves. Along with the decline of antioxidant capability, chlorophyll loss, increase in electrolyte leakage and decrease in maximum photochemical efficiency of photosystem II were also noted. According to the biochemical and photosynthetic changes, we suppose that leaf senescence was accelerated by elevated O-3 in the prolonged fumigation period. (C) 2010 Elsevier B.V. All rights reserved.
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000278884100014
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/121575]
专题	中国科学院沈阳应用生态研究所
通讯作者	He, Xingyuan
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, Dept Urban Forest, Shenyang 110016, Liaoning, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Shenyang Normal Univ, Coll Chem & Life Sci, Shenyang 110034, Peoples R China
推荐引用方式 GB/T 7714	Yan, Kun,Chen, Wei,He, Xingyuan,et al. Responses of photosynthesis, lipid peroxidation and antioxidant system in leaves of Quercus mongolica to elevated O-3[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2010,69(2):198-204.
APA	Yan, Kun,Chen, Wei,He, Xingyuan,Zhang, Guoyou,Xu, Sheng,&Wang, Lanlan.(2010).Responses of photosynthesis, lipid peroxidation and antioxidant system in leaves of Quercus mongolica to elevated O-3.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,69(2),198-204.
MLA	Yan, Kun,et al."Responses of photosynthesis, lipid peroxidation and antioxidant system in leaves of Quercus mongolica to elevated O-3".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 69.2(2010):198-204.