Physiological and biochemical responses to high Mn concentrations in two contrasting Populus cathayana populations

	Physiological and biochemical responses to high Mn concentrations in two contrasting Populus cathayana populations
	Lei, YB ; Korpelainen, H ; Li, CY
刊名	CHEMOSPHERE
	2007
卷号	68 期号:4 页码:686_694
关键词	abscisic acid free amino acids manganese treatment oxidative stress polyamines poplar
ISSN号	0045-6535
通讯作者	Li, CY, Chinese Acad Sci, Chengdu Inst Biol, POB 416, Chengdu 610041, Peoples R China.
中文摘要	We exposed the cuttings of Populus cathayana to Hoagland's solution containing four different manganese (Mn) concentrations (0, 0.1, 0.5 and 1 mM) in a greenhouse to characterize the physiological and biochemical basis of Mn resistance in woody plants. Two contrasting populations of P. cathayana were used in our study, which were from the wet and dry climate regions in western China, respectively. The results showed that Mn treatments significantly decreased chlorophyll content and growth characteristics, including shoot height, basal diameter, biomass accumulation and total leaf area in the two populations. Mn treatments also significantly increased the levels of abscisic acid (ABA), polyamines and free amino acids especially proline (Pro), histidine (His) and phenylalanine (Phe) available for cellular signaling and heavy metal chelation. In addition, high Mn concentrations also caused oxidative stress indicated as the accumulation of hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents. On the other hand, there were different responses to Mn stress between the two contrasting populations. Compared with the dry climate population, the wet climate population accumulated more Mn in plant tissues especially in leaves; it showed lower tolerance index and more pronounced decrease in growth and chlorophyll contents. The wet climate population not only accumulated less ABA, putrescine and free amino acids, but also exhibited lower activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX), thus suffering from more serious oxidative damage. Therefore, our results showed that the wet climate population was more susceptible to Mn stress than the dry climate population. (C) 2007 Elsevier Ltd. All rights reserved.
学科主题	Environmental Sciences
收录类别	SCI
语种	英语
公开日期	2011-07-08
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/22030]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Lei, YB,Korpelainen, H,Li, CY. Physiological and biochemical responses to high Mn concentrations in two contrasting Populus cathayana populations[J]. CHEMOSPHERE,2007,68(4):686_694.
APA	Lei, YB,Korpelainen, H,&Li, CY.(2007).Physiological and biochemical responses to high Mn concentrations in two contrasting Populus cathayana populations.CHEMOSPHERE,68(4),686_694.
MLA	Lei, YB,et al."Physiological and biochemical responses to high Mn concentrations in two contrasting Populus cathayana populations".CHEMOSPHERE 68.4(2007):686_694.