期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 165, 期 12, 页码 1248-1254出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2007.08.011
关键词
salinity; sodium; compartmentalization in root; sodium exclusion; sunflower; transpiration
资金
- Ministerio de Educacion y Ciencia (Spain) [AGL2005-03074]
Twenty-day-old sunflower plants (Helianthus annuus L. cv Sun-Gro 380) grown hydroponically under controlled conditions were used to study the effect of transpiration on Na+ compartmentalization in roots. The plants were exposed to low Na+ concentrations (25 mM NaCl) and different environmental humidity conditions over a short time period (8.5 h). Under these conditions, Na+ was accumulated primarily in the root, but only the Na+ accumulated in the root symplast was dependent on transpiration, while the Na+ accumulated in both the shoot and the root apoplast exhibited a low transpiration dependence. Moreover, Na+ content in the root apoplast was reached quickly (0.25 h) and increased little with time. These results suggest that, in sunflower plants under moderate salinity conditions, Na+ uptake in the root symplast is mediated by a transport system whose activity is enhanced by transpiration. (c) 2007 Elsevier GmbH. All rights reserved.
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