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Journal of Experimental Botany, Vol. 51, No. 349, pp. 1435-1442, August 2000
© 2000 Oxford University Press

Original Papers

Light-induced stomatal movement of selected Arabidopsis thaliana mutants

Martin Eckert and Ralf Kaldenhoff1

Julius-von-Sachs-Institut für Biowissenschaften, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany

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.

Key words: Dual beam irradiation, gas exchange, light signal transduction, phytohormone, stomatal opening.


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