NDLI: Expression and Stress-Dependent Induction of Potassium Channel Transcripts in the Common Ice Plant1

Content Provider	PubMed Central
Author	Su, Hua Golldack, Dortje Maki, Katsuhara Zhao, Chengsong Bohnert, Hans J.
Copyright Year	2001
Abstract	We have characterized transcripts for three potassium channel homologs in the AKT/KAT subfamily (Shaker type) from the common ice plant (Mesembryanthemum crystallinum), with a focus on their expression during salt stress (up to 500 mm NaCl). Mkt1 and 2, Arabidopsis AKT homologs, and Kmt1, a KAT homolog, are members of small gene families with two to three isoforms each. Mkt1 is root specific; Mkt2 is found in leaves, flowers, and seed capsules; and Kmt1 is expressed in leaves and seed capsules. Mkt1 is present in all cells of the root, and in leaves a highly conserved isoform is detected present in all cells with highest abundance in the vasculature. MKT1 for which antibodies were made is localized to the plasma membrane. Following salt stress, MKT1 (transcripts and protein) is drastically down-regulated, Mkt2 transcripts do not change significantly, and Kmt1 is strongly and transiently (maximum at 6 h) up-regulated in leaves and stems. The detection and stress-dependent behavior of abundant transcripts representing subfamilies of potassium channels provides information about tissue specificity and the complex regulation of genes encoding potassium uptake systems in a halophytic plant.
Starting Page	604
File Format	PDF
ISSN	15322548
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	2
Volume Number	125
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	2001-02-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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