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Contrasting patterns of leaf solute accumulation and salt adaptation
/locate/jnlabr/yjare
Journal of
Arid
Environments
Journal of Arid Environments 59 (2004) 259–270
Contrasting patterns of leaf solute accumulation
and salt adaptation in four phreatophytic desert
plants in a hyperarid desert with saline
groundwater
Stefan K. Arndta,*, Christina Arampatsisb, Andrea Foetzkic,
Xiangyi Lid, Fanjiang Zengd, Ximing Zhangd
aForest Science Centre, University of Melbourne, Water Street, Creswick, Vic. 3363, Australia
b Institute of Ecology and Conservation Biology, University of Vienna, Althanstrasse 14,
A-1090 Vienna, Austria
cAvH Institute of Plant Sciences, University of G .ottingen, Untere Karsp .ule 2, D-37073 G .ottingen, Germany
dXinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 40 Beijing Road, Urumqi,
Xinjiang, PR China
Received 1 August 2002; received in revised form 15 December 2003; accepted 27 January 2004
Abstract
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 C4 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
c
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