Abstract:
:High temperature promotes guard cell expansion, which opens stomatal pores to facilitate leaf cooling. How the high-temperature signal is perceived and transmitted to regulate stomatal aperture is, however, unknown. Here, we used a reverse-genetics approach to understand high temperature-mediated stomatal opening in Arabidopsis (Arabidopsis thaliana). Our findings reveal that high temperature-induced guard cell movement requires components involved in blue light-mediated stomatal opening, suggesting cross talk between light and temperature signaling pathways. The molecular players involved include phototropin photoreceptors, plasma membrane H+-ATPases, and multiple members of the 14-3-3 protein family. We further show that phototropin-deficient mutants display impaired rosette evapotranspiration and leaf cooling at high temperatures. Blocking the interaction of 14-3-3 proteins with their client proteins severely impairs high temperature-induced stomatal opening but has no effect on the induction of heat-sensitive guard cell transcripts, supporting the existence of an additional intracellular high-temperature response pathway in plants.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Kostaki KI,Coupel-Ledru A,Bonnell VC,Gustavsson M,Sun P,McLaughlin FJ,Fraser DP,McLachlan DH,Hetherington AM,Dodd AN,Franklin KAdoi
10.1104/pp.19.01528subject
Has Abstractpub_date
2020-03-01 00:00:00pages
1404-1419issue
3eissn
0032-0889issn
1532-2548pii
pp.19.01528journal_volume
182pub_type
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