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

Sarah Mary Assmann, Jo Ann Snyder, Yuh Ru Julie Lee

Research output: Contribution to journalArticle

95 Scopus citations

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 humidityinduced 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.

Original languageEnglish (US)
Pages (from-to)387-395
Number of pages9
JournalPlant, Cell and Environment
Volume23
Issue number4
DOIs
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

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