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学科主题: 生物学::植物学::植物生理学
题名:
Contrasting patterns of leaf solute accumulation and salt adaptation in four phreatophytic desert plants in a hyperarid desert with saline groundwater
作者: Arndt ; SK ; Arampatsis ; C ; Foetzki ; A ; Li ; XY ; Zeng ; FJ ; Zhang ; XM
通讯作者: Arndt, SK, Univ Melbourne, Forest Sci Ctr, Water St, Creswick, Vic 3363, Australia
关键词: TOLERANCE ; MECHANISMS ; TRANSPORT ; RESPONSES ; DROUGHT ; STRESS ; GROWTH ; SAP
刊名: JOURNAL OF ARID ENVIRONMENTS
发表日期: 2004
卷: 59, 期:2, 页:259-270
收录类别: SCI
部门归属: Univ Melbourne, Forest Sci Ctr, Creswick, Vic 3363, Australia; Univ Vienna, Inst Ecol & Conservat Biol, A-1090 Vienna, Austria; Univ Gottingen, AvH Inst Plant Sci, D-37073 Gottingen, Germany; Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang, Peoples R China
摘要: The seasonal variation of leaf solutes was investigated in four perennial phreatophytes in the natural vegetation surrounding a river oasis in the Chinese Taklamakan desert in order to elucidate their adaptation to saline groundwater. Leaves of the herbaceous perennial legume Alhagi sparsifolia, the poplar tree Populus euphratica, the salt cedar Tamarix ramosissima, and the C-4 shrub Calligonum caput-medusae were collected at the end of each month during the growing season 1999 and analysed for cation, anion, organic acid, carbohydrate, glycinebetaine, and proline concentrations. The species revealed considerable differences in the foliar solute composition and their seasonal variation. Tamarix had high foliar mineral salt concentrations throughout the season but excreted the accumulated salts via salt glands. The three other species showed different degrees of ion regulation and ion selectivity. Calligonum had generally very low mineral ion concentrations, tolerated moderate Cl- concentrations and excluded Na+. Populus effectively excluded Cl- from its leaves but Na+ and total solute concentrations increased towards the end of the season which lead to K:Na ratio smaller than one in October. Alhagi showed the highest degree of ion selectivity by excluding Na+ but accumulating Ca2+ in its leaves. Mineral salt composition of xylemsap in Alhagi and Calligonian indicated that both species showed a similar degree of ion selectivity in the roots and that ion retransloction is probably another important mechanism to maintain low salt concentrations in the leaf. The cyclitols chiro-inositol and pinitol were the major compatible solutes in the plants and N-containing solutes like proline or glycinebetaine occurred only in minor concentrations or were absent, respectively. All plant species were well adapted to the moderate salinity of the NaCl dominated groundwater and no signs of salt related drought stress, ion toxicity or nutrient imbalance were observed. (C) 2003 Elsevier Ltd. All rights reserved.
内容类型: 期刊论文
URI标识: http://ir.xjlas.org/handle/365004/10556
Appears in Collections:中国科学院新疆生态与地理研究所(2010年以前数据)_期刊论文

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Recommended Citation:
Arndt,SK,Arampatsis,et al. Contrasting patterns of leaf solute accumulation and salt adaptation in four phreatophytic desert plants in a hyperarid desert with saline groundwater[J]. JOURNAL OF ARID ENVIRONMENTS,2004,59(2):259-270.
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