Phytochrome B increases drought tolerance by enhancing ABA sensitivity in Arabidopsis thaliana

Plant, Cell & Environment
Carina Verónica GonzálezHernán E Boccalandro

Abstract

Phytochrome B (phyB) can adjust morphological and physiological responses according to changes in the red:far-red (R:FR) ratio. phyB-driven acclimation of plants to open environments (high R:FR ratio) increases carbon gain at the expense of increased water loss. This behaviour alleviates stressful conditions generated by an excess of light, but increases the chances of desiccation. Here we evaluated how phyB modulates this drought-tolerance response by comparing wild-type Arabidopsis thaliana adult plants to the null phyB in response to water shortage. phyB wilted before the wild type, and this was due to phyB maintaining open stomata under a reduction in soil water availability. Although phyB presented enhanced ABA levels under well-watered conditions, this mutant was less sensitive than the wild type in diminishing stomatal conductance in response to exogenous ABA application. Reduced sensitivity to ABA in phyB correlated with a lower expression of ABCG22, which encodes a putative ABA influx transporter, and PYL5, which encodes a soluble ABA receptor. Furthermore, the expression of RAB18 and RD29A, both typical ABA-induced genes, was lower in phyB than the wild type after ABA treatment. We propose that phyB contributes to the...Continue Reading

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Citations

Aug 10, 2013·Plant Physiology·Srirama Krishna ReddyScott A Finlayson
Jan 1, 2014·Plants·Nathalie LeducSoulaiman Sakr
Feb 5, 2013·Annual Review of Plant Biology·Jorge J Casal
Oct 18, 2015·Plant Science : an International Journal of Experimental Plant Biology·Paola A Palmeros-SuárezJohn P Délano-Frier
Jun 5, 2014·Plant, Cell & Environment·Ermias HabteMaria von Korff
Jun 24, 2015·Molecular Plant·Ebe MeriloMikael Brosché
Dec 13, 2016·Plant, Cell & Environment·András VicziánFerenc Nagy
Jan 20, 2017·Plant, Cell & Environment·Carlos L Ballaré, Ronald Pierik
Dec 24, 2016·Journal of Integrative Plant Biology·Variluska FragosoIan Thomas Baldwin
Aug 30, 2017·Frontiers in Plant Science·Xiaozhen HanRonan Sulpice
Mar 1, 2018·Functional Plant Biology : FPB·Elena V TyuterevaOlga V Voitsekhovskaja
Nov 16, 2020·Plant, Cell & Environment·Venja M RoeberAnne Cortleven
Mar 9, 2021·Frontiers in Plant Science·Jan SkalakJan Hejatko
Apr 16, 2021·Plant Signaling & Behavior·Yu-Zhen LiChun-Guang Zhang
Jul 10, 2021·Frontiers in Plant Science·Jae Young KimChung-Mo Park

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