Photosynthetic response of Fragaria orientalis in different water contrast clonal integration

	Photosynthetic response of Fragaria orientalis in different water contrast clonal integration
	Zhang, YC ; Zhang, QY ; Luo, P ; Wu, N
刊名	ECOLOGICAL RESEARCH
	2009
卷号	24 期号:3 页码:617_625
关键词	Clonal plant Physiological integration Drought Heterogeneous environment
ISSN号	0912-3814
通讯作者	Wu, N, Chinese Acad Sci, Chengdu Inst Biol, 9 Sect 4,Renmin Nan Rd, Chengdu 610041, Sichuan, Peoples R China.
中文摘要	The capacity to exchange resources and non-resource agents is one of the most outstanding features of clonal plants. Contrast between patches in a heterogeneous environment is the main external driving force behind integration effects. It was hypothesized, on the basis of the source-sink hypothesis, that assimilate demand from drought-stressed ramets will result in enhancement of the photosynthesis of well-watered ramets by a mechanism of feedback regulation, that the negative effect of drought on the photosynthesis of drought-stressed ramets will be ameliorated by physiological integration, and that these effects will be enhanced by increasing contrast. A pot experiment was conducted with clonal fragments consisting of two interconnected ramets of Fragaria orientalis. In the experiment, both the connected and the disconnected clonal fragments were divided into three water contrast groups: (1) homogeneous (no contrast) group; (2) low-contrast group; (3) high-contrast group. The photosynthesis and stress tolerance of drought-stressed ramets did not decrease under the support of well-watered ramets when they were connected, allowing clones to maintain their performance in less favorable environments. But the photosynthesis and stress tolerance of drought-stressed ramets decreased with increasing drought-stress when stolons were disconnected. With a feedback regulation process, the photosynthesis of well-watered ramets connected to drought-stressed ramets was enhanced by the latter, which can compensate, at least partially, for the cost of maintaining the stressed ramets. Drought-stressed ramets gained more benefits in a high-contrast environment than in a lower-contrast environment; this can enhance the survival of drought-stressed ramets in unfavorable habitats, especially stressed patches that would otherwise be unexploitable by independent ramets. But photosynthesis of well-watered ramets did not increase with increasing water availability contrast. It can be concluded that photosynthesis and stress tolerance of F. orientalis was affected by clonal integration and by contrasts of water availability.
学科主题	Ecology
收录类别	SCI
资助信息	Chinese Academy of Sciences [KSCX2-YW-418, KZCX2-XB2-02]; National Natural Science Foundation of China [40671181, 90511008]
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/351003/22382]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Zhang, YC,Zhang, QY,Luo, P,et al. Photosynthetic response of Fragaria orientalis in different water contrast clonal integration[J]. ECOLOGICAL RESEARCH,2009,24(3):617_625.
APA	Zhang, YC,Zhang, QY,Luo, P,&Wu, N.(2009).Photosynthetic response of Fragaria orientalis in different water contrast clonal integration.ECOLOGICAL RESEARCH,24(3),617_625.
MLA	Zhang, YC,et al."Photosynthetic response of Fragaria orientalis in different water contrast clonal integration".ECOLOGICAL RESEARCH 24.3(2009):617_625.