Mechanistic examination of causes for narrow distribution in an endangered shrub: a comparison of its responses to drought stress with a widespread congeneric species

doi:10.1007/s00468-016-1448-8

	Mechanistic examination of causes for narrow distribution in an endangered shrub: a comparison of its responses to drought stress with a widespread congeneric species
	Cui, Hongxia ; Cong, Shuhua 1; Wang, Xianzhong 2; Hao, Haiping ; Shi, Lei; Zhang, Huijin ; Li, Zhigang 3; Hu, Tianhua 3; Qin, Yongsheng 4
	2016
发表期刊	TREES-STRUCTURE AND FUNCTION
ISSN	0931-1890
卷号	30 期号:6 页码:2227-2236
摘要	The endangered status and narrow distribution in Syringa pinnatifolia , a sub-alpine shrub species, were primarily caused by its poor drought adaptation related to its lower degree of physiological adjustment despite its greater degree of morphological plasticity. Although deep rooting is usually considered a drought-tolerant trait, we found that Syringa pinnatifolia, a deep rooting and hydrotropic shrub, has a limited distribution in arid areas. To elucidate the mechanisms for its narrow distribution, we conducted two experiments to examine the physiological and morphological responses to water availability and heterogeneity in S. pinnatifolia and a widespread congeneric species, S. oblata. We measured gas exchange, water use efficiency, and plasticity index in plants of these two species grown at different levels of soil water regimes and in containers with patched water distribution. Our results showed that high photosynthetic capacity in the narrowly distributed S. pinnatifolia was an important factor enabling its survival in the harsh sub-alpine environment. High photosynthetic capacity in S. pinnatifolia, however, was obtained at the expense of high transpiratory water loss, resulting in lower integrative water use efficiency. Biomass allocation to roots in S. pinnatifolia increased by 73 % when soil water increased from 75 to 95 % field capacity, suggesting that S. pinnatifolia could be less competitive for above-ground resources under favorable water regimes. The horizontal root hydrotropism and vertical root hydrotropism of S. pinnatifolia in soil with patched water patterns were likely related to compensation for leaf water loss at low soil water level, indicating a limited capacity for homeostasis within the plant for water conservation and lower level of inherent drought-tolerance. In summary, greater degree of morphological plasticity but lower degree of physiological adjustment may be the main causes for the hydrotropism and narrow distribution of S. pinnatifolia in the sub-alpine habitats.
关键词	Endangered species Hydrotropism Lilac Photosynthesis Soil water Syringa
学科领域	Forestry
DOI	10.1007/s00468-016-1448-8
收录类别	SCI
语种	英语
WOS关键词	HYDRAULIC CONDUCTIVITY ; STOMATAL CONDUCTANCE ; PLANT ; PLASTICITY ; EVOLUTION ; LIGHT ; DIVERSITY ; GROWTH ; LIMITS ; ROOTS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000387723300027
出版者	SPRINGER HEIDELBERG
文献子类	Article
出版地	HEIDELBERG
EISSN	1432-2285
资助机构	National Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [30570175, 31370361] ; Knowledge Innovation Project of Chinese Academy of SciencesKnowledge Innovation Program of the Chinese Academy of Sciences [KSCX2-YW-Z-059, KSCX2-EW-B-5, 863-2013AA102903]
作者邮箱	xzwang@iupui.edu ; shilei@ibcas.ac.cn
作品OA属性	Green Submitted
引用统计
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/24952
专题	中科院北方资源植物重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, 20 Nanxincun, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, 15 Yuquanlu, Beijing 100049, Peoples R China 3.Indiana Univ Purdue Univ, Dept Biol, 723 West Michigan St, Indianapolis, IN 46202 USA 4.Helan Mt Natl Area, 71 Helan Rd, Yinchuan 750200, Peoples R China 5.Inst Gardening, 13 Xinhua St, Hohhot 010030, Inner Mongolia, Peoples R China
推荐引用方式 GB/T 7714	Cui, Hongxia,Cong, Shuhua,Wang, Xianzhong,et al. Mechanistic examination of causes for narrow distribution in an endangered shrub: a comparison of its responses to drought stress with a widespread congeneric species[J]. TREES-STRUCTURE AND FUNCTION,2016,30(6):2227-2236.
APA	Cui, Hongxia.,Cong, Shuhua.,Wang, Xianzhong.,Hao, Haiping.,Shi, Lei.,...&Qin, Yongsheng.(2016).Mechanistic examination of causes for narrow distribution in an endangered shrub: a comparison of its responses to drought stress with a widespread congeneric species.TREES-STRUCTURE AND FUNCTION,30(6),2227-2236.
MLA	Cui, Hongxia,et al."Mechanistic examination of causes for narrow distribution in an endangered shrub: a comparison of its responses to drought stress with a widespread congeneric species".TREES-STRUCTURE AND FUNCTION 30.6(2016):2227-2236.

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