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

被引:15
作者
Butt, AD
Blatt, MR
Ainsworth, CC
机构
[1] UNIV LONDON WYE COLL,PLANT MOL BIOL LAB,DEPT SCI BIOL,ASHFORD TN25 5AH,KENT,ENGLAND
[2] UNIV LONDON WYE COLL,LAB PHYSIOL & BIOPHYS,DEPT SCI BIOL,ASHFORD TN25 5AH,KENT,ENGLAND
关键词
Arabidopsis thaliana; wheat (Triticum aestivum); rape (Brassica napus); broad bean (Phaseolus vulgaris); tomato (Lycopersicon exculentum); faba bean (Vicia faba); gene family; plant development; potassium channel; tissue-specific expression;
D O I
10.1016/S0176-1617(97)80279-9
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
引用
收藏
页码:652 / 660
页数:9
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