Salt tolerance inAster tripoliumL. II. Ionic regulation
作者:
C. SHENNAN,
R. HUNT,
E. A. C. MACROBBIE,
期刊:
Plant, Cell&Environment
(WILEY Available online 1987)
卷期:
Volume 10,
issue 1
页码: 67-74
ISSN:0140-7791
年代: 1987
DOI:10.1111/j.1365-3040.1987.tb02081.x
出版商: Blackwell Publishing Ltd
关键词: Aster tripolium;Asteraceae;sea aster;salinity;ion regulation;sodium;potassium;chloride;osmotic adjustment
数据来源: WILEY
摘要:
AbstractMeasurements of tissue ion contents (Na, K and Cl) were carried out at frequent intervals on plants ofAster tripoliumL. grown at a range of salinities for 36 d. Aster tripolium behaved as a typical halophyte showing high levels of inorganic ion accumulation even at low salinities. As salinity increased Na replaced K to a large extent in the shoot but root K was unaffected up to 500 mol m−3external NaCl. Shoot (Na + K) concentration on a tissue water basis was maintained constant in all treatments throughout the experiment, whereas shoot (Na + K) on a dry weight basis showed marked fluctuations in some treatments. An increase in (Na + K) per gram dry weight was, however, accompanied by a parallel increase in fresh weight: dry weight (FW : DW) ratio. Transport of (Na + K) to the shoot per unit root weight changed during the experiment in the manner expected, given the observed changes in shoot relative growth rate and FW : DW to result in a constant shoot (Na + K) concentration on a water basis.Chloride was the major balancing anion in the shoot at high salinity, but never accounted for more than 38% of the (Na + K) found in the root tissue. At all salinities (Na + K) salts accounted for the majority of the measured shoot sap osmotic potential. The interactions between salinity, growth, ion transport and osmotic adjustment are discusse
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