The Arabidopsis alkaline ceramidase TOD1 is a key turgor pressure regulator in plant cells.

Abstract:

:Turgor pressure plays pivotal roles in the growth and movement of walled cells that make up plants and fungi. However, the molecular mechanisms regulating turgor pressure and the coordination between turgor pressure and cell wall remodelling for cell growth remain poorly understood. Here, we report the characterization of Arabidopsis TurgOr regulation Defect 1 (TOD1), which is preferentially expressed in pollen tubes and silique guard cells. We demonstrate that TOD1 is a Golgi-localized alkaline ceramidase. tod1 mutant pollen tubes have higher turgor than wild type and show growth retardation both in pistils and in agarose medium. In addition, tod1 guard cells are insensitive to abscisic acid (ABA)-induced stomatal closure, whereas sphingosine-1-phosphate, a putative downstream component of ABA signalling and product of alkaline ceramidases, promotes closure in both wild type and tod1. Our data suggest that TOD1 acts in turgor pressure regulation in both guard cells and pollen tubes.

journal_name

Nat Commun

journal_title

Nature communications

authors

Chen LY,Shi DQ,Zhang WJ,Tang ZS,Liu J,Yang WC

doi

10.1038/ncomms7030

subject

Has Abstract

pub_date

2015-01-16 00:00:00

pages

6030

issn

2041-1723

pii

ncomms7030

journal_volume

6

pub_type

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