ABA induces H2O2 production in guard cells, but does not close the stomata on Vicia faba leaves developed at high air humidity

Plant Signaling & Behavior
Louise E ArveSissel Torre

Abstract

Plants developed under constant high (> 85%) relative air humidity (RH) have larger stomata that are unable to close completely. One of the hypotheses for the less responsive stomata is that the plants have reduced sensitivity to abscisic acid (ABA). Both ABA and darkness are signals for stomatal closure and induce the production of the secondary messenger hydrogen peroxide (H2O2). In this study, the ability of Vicia faba plants developed in moderate or high RH to close the stomata in response to darkness, ABA and H2O2 was investigated. Moreover, the ability of the plants to produce H2O2 when treated with ABA or transferred to darkness was also assessed. Our results show that the ABA concentration in moderate RH is not increased during darkness even though the stomata are closing. This indicates that stomatal closure in V. faba during darkness is independent of ABA production. ABA induced both H2O2 production and stomatal closure in stomata formed at moderate RH. H2O2 production, as a result of treatment with ABA, was also observed in stomata formed at high RH, though the closing response was considerably smaller as compared with moderate RH. In either RH, leaf ABA concentration was not affected by darkness. Similarly to ABA tr...Continue Reading

References

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Citations

Oct 30, 2016·Journal of Plant Physiology·Dimitrios FanourakisCarl-Otto Ottosen
Nov 28, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Sheona N InnesSissel Torre
Aug 19, 2017·Proteomes·May AlqurashiClaudius Marondedze
Oct 1, 2019·Journal of Experimental Botany·Uulke Van MeeterenSasan Aliniaeifard
Jun 3, 2020·Plant Physiology and Biochemistry : PPB·Dimitrios FanourakisGeorgios Tsaniklidis

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Methods Mentioned

BETA
light treatment
fluorescence microscopy

Software Mentioned

QuanLynx
Fiji
MassLynx
Fiji ImageJ

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