Ronne, Hans
- Department of Molecular Sciences, Swedish University of Agricultural Sciences
Abstract
During the transition from water to land, plants had to cope with the loss of water through transpiration, the inevitable result of photosynthetic CO2 fixation on land [1, 2]. Control of transpiration became possible through the development of a new cell type: guard cells, which form stomata. In vascular plants, stomatal regulation is mediated by the stress hormone ABA, which triggers the opening of the SnR kinase OST1-activated anion channel SLAC1 [3, 4]. To understand the evolution of this regulatory circuit, we cloned both ABA-signaling elements, SLAC1 and OST1, from a charophyte alga, a liverwort, and a moss, and functionally analyzed the channel-kinase interactions. We were able to show that the emergence of stomata in the last common ancestor of mosses and vascular plants coincided with the origin of SLAC1-type channels capable of using the ancient ABA drought signaling kinase OST1 for regulation of stomatal closure.
Published in
Current Biology
2015, volume: 25, number: 7, pages: 928-935
Publisher: CELL PRESS
SLU Authors
UKÄ Subject classification
Botany
Evolutionary Biology
Publication identifier
- DOI: https://doi.org/10.1016/j.cub.2015.01.067
Permanent link to this page (URI)
https://res.slu.se/id/publ/73877