Plant Hormones pp 519-548 | Cite as

Hormones and the Regulation of Water Balance

  • Ian C. Dodd
  • William J. Davies


Soil water status limits both species distribution and crop yield and a longheld view is that plant water status is the key variable that mediates the influence of soil drying. Plant water status can be a highly dynamic variable that fluctuates over varying time scales. For example, over the course of a day, plant water status of even a well-watered plant declines as solar noon approaches, as transpiration increases with increasing evaporative demand. The plant will hydrate again as temperatures (and transpiration) decrease towards the end of the day. In between rainfall (or irrigation) events, plant water status will generally decrease along with soil water status. In many circumstances, we are content with the suggestion that as soil dries, reduced uptake of water from drying soil results in shoot water deficit which closes stomata to restrict water loss and further shoot dehydration.


Abscisic Acid Guard Cell Stomatal Closure Plant Water Status Stomatal Response 
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© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.The Lancaster Environment Centre, Lancaster UniversityUK

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