警卫室
脱落酸
突变体
拟南芥
蒸腾作用
生物
基因
拟南芥
细胞生物学
表型
遗传学
植物
光合作用
作者
Takashi Kuromori,Eriko Sugimoto,Kazuo Shinozaki
出处
期刊:Plant Journal
[Wiley]
日期:2011-05-16
卷期号:67 (5): 885-894
被引量:192
标识
DOI:10.1111/j.1365-313x.2011.04641.x
摘要
Summary In plants, water vapour is released into the atmosphere through stomata in a process called transpiration. Abscisic acid (ABA) is a key phytohormone that facilitates stomatal closure through its action on guard cells. Recently, ATP‐binding cassette (ABC) transporter genes, AtABCG25 and AtABCG40 , were shown to be involved in ABA transport and responses. However, the functions of many other AtABCG family genes are still unknown. Here, we identified another ABCG gene ( AtABCG22 ) that is required for stomatal regulation in Arabidopsis. The atabcg22 mutant plants had lower leaf temperatures and increased water loss, implying elevated transpiration through an influence on stomatal regulation. We also found that atabcg22 plants were more suspectible to drought stress than wild‐type plants. AtABCG22 was expressed in aerial organs, mainly guard cells, in which the gene expression pattern was consistent with the mutant phenotypes. Using double mutants, we investigated the genetic relationships between the mutations. The atabcg22 mutation further increased the water loss of srk2e / ost1 mutants, which were defective in ABA signalling in guard cells. Also, the atabcg22 mutation enhanced the phenotype of nced3 mutants, which were defective in ABA biosynthesis. Accordingly, the additive roles of AtABCG22 functions in ABA signalling and ABA biosynthesis are discussed.
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