NDLI: An Arabidopsis mutant that requires increased calcium for potassium nutrition and salt tolerance

Content Provider	PubMed Central
Author	Liu, Jiping Zhu, Jian-kang
Copyright Year	1997
Abstract	Potassium (K+) nutrition and salt tolerance are key factors controlling plant productivity. However, the mechanisms by which plants regulate K+ nutrition and salt tolerance are poorly understood. We report here the identification of an Arabidopsis thaliana mutant, sos3 (salt-overly-sensitive 3), which is hypersensitive to Na+ and Li+ stresses. The mutation is recessive and is in a nuclear gene that maps to chromosome V. The sos3 mutation also renders the plant unable to grow on low K+. Surprisingly, increased extracellular Ca2+ suppresses the growth defect of sos3 plants on low K+ or 50 mM NaCl. In contrast, high concentrations of external Ca2+ do not rescue the growth of the salt-hypersensitive sos1 mutant on low K+ or 50 mM NaCl. Under NaCl stress, sos3 seedlings accumulated more Na+ and less K+ than the wild type. Increased external Ca2+ improved K+/Na+ selectivity of both sos3 and wild-type plants. However, this Ca2+ effect in sos3 is more than twice as much as that in the wild type. In addition to defining the first plant mutant with an altered calcium response, these results demonstrate that the SOS3 locus is essential for K+ nutrition, K+/Na+ selectivity, and salt tolerance in higher plants.
Starting Page	14960
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	26
Volume Number	94
Language	English
Publisher	The National Academy of Sciences of the USA
Publisher Date	1997-12-23
Access Restriction	Open
Rights Holder	The National Academy of Sciences of the USA
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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An Arabidopsis mutant that requires increased calcium for potassium nutrition and salt tolerance

An Arabidopsis mutant that requires increased calcium for potassium nutrition and salt tolerance.

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