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ABA-deficient (aba1) and ABA-insensitive (abi1-1, abi2-1) mutants of Arabidopsis have a wild-type stomatal response to humidity by Sarah M. Assmann; Jo Ann Snyder; Yuh-Ru Julie Lee is a Agricultural and Biological Sciences article available to read on EtoBox.

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## ABSTRACT 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 pote

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

Author

Sarah M. Assmann; Jo Ann Snyder; Yuh-Ru Julie Lee

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0140-7791)

Published

2000

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)