Expression, evolution and genomic complexity of potassium ion channel genes of Arabidopsis thaliana

Potassium ion (K +) channels are of major importance in several functionally diverse processes in plant physiology, including K + transport, membrane potential control, osmoregulation, and stomatal movement. In animals, K + channels are encoded by multigene families and are differentially expressed...

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Bibliographic Details
Published in:Journal of plant physiology 1997, Vol.150 (6), p.652-660
Main Authors: Butt, Adrian D., Blatt, Michael R., Ainsworth, Charles C.
Format: Article
Language:English
Subjects:
ADN
ARABIDOPSIS THALIANA
ARN
Biological and medical sciences
BLE
BOHNE
BRASSICA NAPUS
broad bean (Phaseolus vulgaris)
CDNA
Cell physiology
DNA
EVOLUCION
EVOLUTION
faba bean (Vicia faba)
Fundamental and applied biological sciences. Psychology
GENE
gene family
GENES
GENFAMILIE
GENOMAS
GENOME
GENOMES
ION
IONES
IONS
KALIUMIONENKANAL
LYCOPERSICON ESCULENTUM
MRNA
PFLANZENENTWICKLUNG
PHASEOLUS VULGARIS
plant development
Plant physiology and development
Plasma membrane and permeation
POTASIO
POTASSIUM
potassium channel
rape (Brassica napus)
RAPS
RNA
tissue-specific expression
TOMATE
tomato (Lycopersicon esculentum)
TOMATOES
TRIGO
TRITICUM AESTIVUM
VICIA FABA
wheat (Triticum aestivum)
WHEATS
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Summary:Potassium ion (K +) channels are of major importance in several functionally diverse processes in plant physiology, including K + transport, membrane potential control, osmoregulation, and stomatal movement. In animals, K + channels are encoded by multigene families and are differentially expressed during development. Little is known about the genomic organisation, expression or evolution of plant K + channels. We report here, the partial sequence of a putative K+ channel cDNA from Arabidopsis (KAT2) showing sequence homology to previously identified voltage-gated K + channel genes KAT1 and AKT1, and which hybridises to a single 2.1 kb mRNA in leaves. The existence of KAT2, together with numerous similar sequences identified by Southern blot analyses, suggest that K + channels in Arabidopsis are encoded by multiple genes. Southern blot data also suggest that KAT and AKT homologs are present in many other plant species. Analysis of the expression pattern of KAT1, KAT2 and AKT1 demonstrate a tissue-specific regulation of K + channel genes in plants.
ISSN:0176-1617
1618-1328
DOI:10.1016/S0176-1617(97)80279-9