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Hormonal dynamics contributes to divergence in seasonal stomatal behaviour in a monsoonal plant community
journal contribution
posted on 2023-05-18, 07:18 authored by McAdam, SAM, Timothy BrodribbTimothy BrodribbThe plant hormone abscisic acid (ABA) is a primary regulator of plant transpiration, but its influence in determining seasonal stomatal behaviour in natural plant communities is poorly understood. We examined distantly related vascular plants growing together in a seasonally dry, monsoonal environment to determine whether ABA dynamics contributed to contrasting water use patterns in this natural setting. Regular sampling of angiosperm, cycad, conifer and fern species revealed characteristic seasonal patterns in ABA production, but these were highly distinct among species. Although no general relationship was observed between ABA levels, plant hydration or stomatal conductance among species, the seasonal dynamics in stomatal behaviour within species were predictable functions of either ABA or leaf water potential. Strong divergence in the seasonal role of ABA among species suggests that modification in ABA– stomatal interactions represents an important evolutionary pathway for adaptation in plant water use.
Funding
Australian Research Council
History
Publication title
Plant, Cell and EnvironmentVolume
38Pagination
423-432ISSN
0140-7791Department/School
School of Natural SciencesPublisher
Blackwell Publishing LtdPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRights statement
Copyright 2014 JohnWiley & Sons LtdRepository Status
- Restricted