ABA-deficient (aba1) and ABA-insensitive (abi1-1, abi2-1) mutants of Arabidopsis have a wild-type stomatal response to humidity

被引：105

作者：

Assmann, SM ^{[1
]}

Snyder, JA ^{[1
]}

Lee, YRJ ^{[1
]}

机构：

[1] Penn State Univ, Dept Biol, Mueller Lab 208, University Pk, PA 16802 USA

来源：

PLANT CELL AND ENVIRONMENT | 2000年 / 23卷 / 04期

关键词：

abscisic acid; ABA; Arabidopsis thaliana; aba1; abi1; abi2; guard cell; humidity response; stomatal conductance; transpiration; vapour pressure difference;

D O I：

10.1046/j.1365-3040.2000.00551.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

In most plant species, a decrease in atmospheric humidity at the leaf surface triggers a decrease in stomatal conductance. While guard cells appear to respond to humidity-induced changes in transpiration rate, as opposed to relative humidity or vapour pressure difference, the underlying cellular mechanisms for this response remain unknown. In the present set of experiments, abscisic acid (ABA)-deficient (aba1) and ABA-insensitive (abi1-1 and abi2-1) mutants of Arabidopsis thaliana were used to test the hypothesis that the humidity signal is transduced by changes in the flux or concentration of ABA delivered to the stomatal complex in the transpiration stream. In gas exchange experiments, stomatal conductance was as sensitive to changes in vapour pressure difference in aba1, abi1-1 and abi2-1 mutant plants as in wild-type plants. These experiments appear to rule out an obligate role for either the concentration or flux of ABA or ABA conjugates as mediators of the guard cell response to atmospheric water potential. The results stand in contrast to the well-established role of ABA in mediating guard cell responses to decreases in soil water potential.

引用

页码：387 / 395

页数：9

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