Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya-Hengduan Mountains Region

CORC > 昆明植物研究所 > 中国科学院昆明植物研究所 > 中国科学院东亚植物多样性与生物地理学重点实验室

	Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya-Hengduan Mountains Region
	Guo, Wen; Yang, Jie; Sun, Xu-Dong; Chen, Guang-Jie; Yang, Yong-Ping; Duan, Yuan-Wen
刊名	FRONTIERS IN PLANT SCIENCE
	2016-08-31
卷号	7 期号:1 页码:1329
关键词	C. angustifolium cytotype distribution common garden experiment drought tolerance physiological fitness
英文摘要	Polyploid species generally occupy harsher habitats (characterized by cold, drought and/or high altitude) than diploids, but the converse was observed for Chamerion angustifolium, in which diploid plants generally inhabit higher altitudes than their polyploid derivatives. Plants at high altitudes may experience cold-induced water stress, and we therefore examined the physiological responses of diploid and hexaploid angustifolium to water stress to better understand the ecological differentiation of plants with different ploidy levels. We conducted a common garden experiment by subjecting seedlings of different ploidy levels to low, moderate, and severe water stress. Fourteen indicators of physiological fitness were measured, and the anatomical characteristics of the leaves of each cytotype were determined. Both cytotypes were influenced by drought, and diploids exhibited higher fitness in terms of constant root:shoot ratio (R:S ratio) and maximum quantum yield of PS II (F-v/F-m), less reduced maximal photosynthetic rate (A(max)), transpiration rate (E), intercellular CO2 concentration (C-i) and stomatal conductance (gs), and higher long-term water use efficiency (WUEL) under severe water stress than did hexaploids. Analysis of leaf anatomy revealed morphological adjustments for tolerating water deficiency in diploids, in the form of closely packed mesophyll cells and small conduits in the midvein. Our results indicate that diploid C. angustifolium is more tolerant of drought than hexaploid plants, ensuring the successful survival of the diploid at high altitudes. This eco-physiological divergence may facilitate the species with different cytotypes to colonize new and large geographic ranges with heterogeneous environmental conditions.
类目[WOS]	Plant Sciences
研究领域[WOS]	Plant Sciences
关键词[WOS]	SENECIO-CARNIOLICUS ASTERACEAE ; WATER-STRESS ; XYLEM CAVITATION ; CONTACT ZONE ; CHLOROPHYLL FLUORESCENCE ; VENATION ARCHITECTURE ; HEXAPLOID CYTOTYPES ; FLOWERING PLANTS ; CLIMATIC NICHES ; EASTERN ALPS
收录类别	SCI
语种	英语
WOS记录号	WOS:000382284000001
内容类型	期刊论文
源URL	[http://ir.kib.ac.cn/handle/151853/28596]
专题	昆明植物研究所_中国科学院东亚植物多样性与生物地理学重点实验室
推荐引用方式 GB/T 7714	Guo, Wen,Yang, Jie,Sun, Xu-Dong,et al. Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya-Hengduan Mountains Region[J]. FRONTIERS IN PLANT SCIENCE,2016,7(1):1329.
APA	Guo, Wen,Yang, Jie,Sun, Xu-Dong,Chen, Guang-Jie,Yang, Yong-Ping,&Duan, Yuan-Wen.(2016).Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya-Hengduan Mountains Region.FRONTIERS IN PLANT SCIENCE,7(1),1329.
MLA	Guo, Wen,et al."Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya-Hengduan Mountains Region".FRONTIERS IN PLANT SCIENCE 7.1(2016):1329.