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

By S. Assmann, J. A. Snyder, Y. Lee. 2000

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Physiology and molecular biology of stress tolerance in plants (2006, background): “Although ABA genes are known to be up-regulated under drought conditions, rapid closure of stomata has also been observed in abi1 and aba2 Arabidopsis mutants (Assmann et al., 2000).”
Long‐distance CO2 signalling in plants (2002, background): “Finally, the question of how plants sense CO2 is one that has not been addressed here thus far, probably because it is the most difficult to answer; however a recent review has discussed this question ( Assmann, 1999 ) and so this is only briefly mentioned here.”
The control of stomata by water balance. (2005, background): “However, Assmann et al. (2000) found normal steadystate humidity responses in ABA-insensitive and ABAdeficient mutants, suggesting that ABA may not be a necessary component of hydro-active local feedback.”
Abscisic Acid Synthesis and Response (2013, background): “Surprisingly, many mutants that have defects in guard cell response to ABA are still responsive to hydraulic conductance and humidity effects on stomatal conductance (Assmann et al., 2000; Pantin et al., 2013).”