Morphological, anatomical and physiological responses of Campylotropis polyantha (Franch.) Schindl. seedlings to progressive water stress

	Morphological, anatomical and physiological responses of Campylotropis polyantha (Franch.) Schindl. seedlings to progressive water stress
	Li, Fang-Lan ; Bao, Wei-Kai ; Wu, Ning
刊名	SCIENTIA HORTICULTURAE
	2011
卷号	127 期号:3 页码:436-443
关键词	Water deficit Drought adaptation Leaf traits Morphological plasticity Chlorophyll a fluorescence Water threshold
ISSN号	0304-4238
通讯作者	Bao, WK (reprint author), Chinese Acad Sci, Chengdu Inst Biol, Key Lab Ecol Restorat, Chengdu 610041, Peoples R China.
产权排序	1
英文摘要	In this study we implemented a potted water supply experiment for 100 days by a completely random sole-factored design with five treatments: 100% (W(100)). 80% (W(80)), 60% (W(60)). 40% (W(40)) and 20% (W(20)) of water holding capacity (WHC), corresponding to the soil volumetric water content (SVWC) maintained at 38.8 +/- 0.3%, 31.6 +/- 1.7%, 25.6 +/- 1.3%, 16.5 +/- 0.7%, and 8.1 +/- 1.1%, respectively. The objective was to evaluate the ability of the 2-month-old Campylotropis polyantha (Franch.) Schindl. seedlings to tolerate drought and to explore the mechanism resisting drought. We monitored the growth process of seedling height and leaf number monthly and further investigated those changes in plant growth, dry mass accumulation and allocation, water-use efficiency (WUE), leaf functional traits, chlorophyll a fluorescence and pigment contents across the water deficit gradient. We found that the seedlings presented optimal growth, dry mass production, and physiological activity only at the W(100) and W(80) treatments and afterwards significantly decreased with progressive water deficit: the WUE was improved under moderate water stress (W(60) and W(40)) but reduced under severe stress (W(20)). The serious leaf shedding, growth stopping and seedling death under the W(20) condition revealed that the current-year shrub seedlings could not withstand severe drought. Water stress-induced decrease in total plant leaf area due to a combination of limited expansion of younger leaves and shedding of old leaves caused the leaf area ratio reduction under drought. The reduced mesophyll cell was a major anatomical response of leaves along the water stress gradient. The progressive water stress significantly damaged light harvesting complex and reduced photochemical processes and PSII activity. Our results clearly showed that the current-year shrub seedlings took the avoidance and tolerance mechanisms to withstand progressive drought stress and around 25.6% SVWC and around 12.3% SVWC separately are thresholds to limit the optimal growth and dry mass production and to last growing and surviving for the current-year shrub seedlings. (C) 2010 Elsevier B.V. All rights reserved.
学科主题	Agriculture
收录类别	SCI
资助信息	PhD foundation in Western Light Talent Training Plan[08C2041100]; Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, CAS[08B2011106]
语种	英语
WOS记录号	WOS:000286712300038
公开日期	2012-11-09
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/23461]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Li, Fang-Lan,Bao, Wei-Kai,Wu, Ning. Morphological, anatomical and physiological responses of Campylotropis polyantha (Franch.) Schindl. seedlings to progressive water stress[J]. SCIENTIA HORTICULTURAE,2011,127(3):436-443.
APA	Li, Fang-Lan,Bao, Wei-Kai,&Wu, Ning.(2011).Morphological, anatomical and physiological responses of Campylotropis polyantha (Franch.) Schindl. seedlings to progressive water stress.SCIENTIA HORTICULTURAE,127(3),436-443.
MLA	Li, Fang-Lan,et al."Morphological, anatomical and physiological responses of Campylotropis polyantha (Franch.) Schindl. seedlings to progressive water stress".SCIENTIA HORTICULTURAE 127.3(2011):436-443.