Developmental Priming of Stomatal Sensitivity to Abscisic Acid by Leaf Microclimate

Florent Pantin, Jeanne Renaud, Francois Barbier, Alain Vavasseur, Didier Le Thiec, Christophe Rose, Thierry Bariac, Stuart Casson, Deirdre H. McLachlan, Alistair M. Hetherington, Bertrand Muller, Thierry Simonneau*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

57 Citations (Scopus)

Abstract

Plant water loss and CO2 uptake are controlled by valve-like structures on the leaf surface known as stomata. Stomatal aperture is regulated by hormonal and environmental signals. We show here that stomatal sensitivity to the drought hormone abscisic acid (ABA) is acquired during leaf development by exposure to an increasingly dryer atmosphere in the rosette plant Arabidopsis. Young leaves, which develop in the center of the rosette, do not close in response to ABA. As the leaves increase in size, they are naturally exposed to increasingly dry air as a consequence of the spatial arrangement of the leaves, and this triggers the acquisition of ABA sensitivity. Interestingly, stomatal ABA sensitivity in young leaves is rapidly restored upon water stress. These findings shed new light on how plant architecture and stomatal physiology have coevolved to optimize carbon gain against water loss in stressing environments.

Original languageEnglish
Pages (from-to)1805-1811
Number of pages7
JournalCurrent Biology
Volume23
Issue number18
DOIs
Publication statusPublished - 23 Sep 2013

Keywords

  • ATMOSPHERIC RELATIVE-HUMIDITY
  • WATER-STRESS
  • XANTHIUM-STRUMARIUM
  • ARABIDOPSIS LEAVES
  • AIR HUMIDITY
  • ABA
  • AGE
  • TRANSPIRATION
  • CONDUCTANCE
  • METABOLISM

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