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学科主题: 生物科学::植物学
题名: Divergence in Eco-Physiological Responses to Drought Mirrors the Distinct Distribution of Chamerion angustifolium Cytotypes in the Himalaya-Hengduan Mountains Region
作者: Guo, W (Guo, Wen)1, 2, 3, 4; Yang, J (Yang, Jie)5; Sun, XD (Sun, Xu-Dong)1, 2, 4; Chen, GJ (Chen, Guang-Jie)6; Yang, YP (Yang, Yong-Ping)1, 2, 4; Duan, YW (Duan, Yuan-Wen)1, 2, 4
通讯作者: Yang, YP ; Duan, YW
关键词: SENECIO-CARNIOLICUS ASTERACEAE ; WATER-STRESS ; CONTACT ZONE ; CHLOROPHYLL FLUORESCENCE ; VENATION ARCHITECTURE ; HEXAPLOID CYTOTYPES ; FLOWERING PLANTS ; XYLEM CAVITATION ; CLIMATIC NICHES ; EASTERN ALPS
刊名: FRONTIERS IN PLANT SCIENCE
发表日期: 2016
DOI: 10.3389/fpls.2016.01329
卷: 7, 期:0, 页:1329
收录类别: SCI
合作性质: 国内
文章类型: Article
部门归属: 生态
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.
语种: 英语
WOS记录号: WOS:000382284000001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7620
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming, Peoples R China
2.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Plant Germplasm & Genom Ctr, Kunming, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Kunming Inst Bot, Inst Tibetan Plateau Res Kunming, Kunming, Peoples R China
5.Yunnan Normal Univ, Sch Life Sci, Kunming, Peoples R China
6.Yunnan Normal Univ, Sch Tourism & Geog, Key Lab Plateau Lake Ecol & Global Change, Kunming, Peoples R China

Recommended Citation:
Guo, W ,Yang, J ,Sun, XD ,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(0):1329.
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文件名: V.7 1329 2016.pdf
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