Acta Botanica Sinica Volume 39 Issue 4, Pages .
A Mathematical Simulation of Stomatal Regulation Associated with Root-Originated ABA

Jin Ming-xian and Wang Tian-duo

Abstract:
A steady-state model of stomatal regulation has been developed, which includes a water flow system involving the effect of root-originated ABA. The influences of vapour pressure deficiency (VPD), air temperature and water content in the uppermost soil layer ( ¦Ès1 ) on leaf water potential, ABA concentration in xylem sap ([ ABA]x) and stomatal conductance had been simulated. The resuits show that changes in VPD and air temperature affect the leaf water potential and stomatal conductance, in which the [ABA]x played a decisive role in controlling the extent of their affect, although they had very littly effect on [ ABA] x itself.

Keywords:
Simulation, Vapour pressure deficiency, Air temperature, Soil water content, ABA, Stomatal conductance

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