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The control of stomata by water balance

Buckley, Thomas

Description

It is clear that stomata play a critical role in regulating water loss from terrestrial vegetation. What is not clear is how this regulation is achieved. Stomata appear to respond to perturbations of many aspects of the soil-plant-atmosphere hydraulic continuum, but there is little agreement regarding the mechanism (or mechanisms) by which stomata sense such perturbations. This review discusses feedback and feedforward mechanisms by which hydraulic perturbations are putatively transduced into...[Show more]

dc.contributor.authorBuckley, Thomas
dc.date.accessioned2015-12-13T23:02:18Z
dc.identifier.issn0028-646X
dc.identifier.urihttp://hdl.handle.net/1885/84829
dc.description.abstractIt is clear that stomata play a critical role in regulating water loss from terrestrial vegetation. What is not clear is how this regulation is achieved. Stomata appear to respond to perturbations of many aspects of the soil-plant-atmosphere hydraulic continuum, but there is little agreement regarding the mechanism (or mechanisms) by which stomata sense such perturbations. This review discusses feedback and feedforward mechanisms by which hydraulic perturbations are putatively transduced into stomatal movements, in relation to generic empirical features of those responses. It is argued that a metabolically mediated feedback response of stomatal guard cells to the water status in their immediate vicinity ('hydro-active local feedback') remains the best explanation for many well-known features of hydraulically related stomatal behaviour, such as transient 'wrong-way' responses and the equivalence of hydraulic supply and demand as stomatal effectors. Furthermore, many curious phenomena that appear inconsistent with feedback, such as 'apparent feedforward' humidity responses and 'isohydric' behaviour (water potential homeostasis), are in fact expected to emerge from the juxtaposition of hydro-active local feedback and the well-known hysteretic and threshold-like effect of water potential on xylem hydraulic resistance.
dc.publisherCambridge University Press
dc.sourceNew Phytologist
dc.subjectKeywords: hydraulic conductivity; perturbation; plant water relations; stomatal conductance; water retention; xylem; water; biological model; biomechanics; cytology; feedback system; metabolism; plant leaf; review; Biomechanics; Feedback; Models, Biological; Plant Cavitation; Feedback; Feedforward; Stomatal conductance; Transpiration; Water potential
dc.titleThe control of stomata by water balance
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume168
dc.date.issued2005
local.identifier.absfor060705 - Plant Physiology
local.identifier.ariespublicationMigratedxPub13066
local.type.statusPublished Version
local.contributor.affiliationBuckley, Thomas, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage275
local.bibliographicCitation.lastpage292
local.identifier.doi10.1111/j.1469-8137.2005.01543.x
dc.date.updated2015-12-12T07:46:13Z
local.identifier.scopusID2-s2.0-32944477602
CollectionsANU Research Publications

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