Light‐induced stomatal movement of selected Arabidopsis thaliana mutants

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Abstract
Various Arabidopsis thaliana mutants with defects in phytohormone signal transduction or the reception of light were analysed with regard to their stomatal response in a red, red/blue light irradiation programme. Stomatal response to light was detected with a customized gas exchange measurement device, optimized for the small model plant. Small transpiration‐kinetic variations of the two wild‐type lines Columbia (Col) and Landsberg erecta (Ler) were observed. A comparison of the mutant lines to the respective wild type revealed significant differences for the phytochrome A (phyA‐103), the abscisic acid insensitive (aba3‐2) and the auxin resistant (axr1‐3) mutant. Furthermore, the zeaxanthin‐less mutant line npq1‐2 showed no alterations in stomatal response to light.