Benjamin R Binstock's research while affiliated with Purdue University and other places

... Some work suggests that stomatal closure is driven by the rapid up-regulation of foliar ABA levels following a VPD-induced loss of leaf turgor (Bauer et al., 2013;McAdam and Brodribb, 2015). For example, in the dicot herb, Senecio minimus, small increases in VPD had no effect on stomatal conductance, while step increases in VPD calculated to be large enough to reduce leaf turgor both increased leaf ABA content and triggered decreases in stomatal conductance (Binstock et al., 2023). However, the observations that stomata in isolated epidermis show a VPD response (Lösch, 1977), and that ABA-deficient mutants exhibit a reduction in a stomatal aperture in response to VPD, just like wild type (Assmann et al., 2000;Merilo et al., 2018), raises a debate regarding the essentiality of ABA in the VPD response. ...