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Plant function and evolutionary biology
RESEARCH ARTICLE

Towards a conceptual ABA ideotype in plant breeding for water limited environments

Abraham Blum
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Plantstress.com, PO Box 16246, Tel Aviv, Israel. Email: ablum@plantstress.com

Functional Plant Biology 42(6) 502-513 https://doi.org/10.1071/FP14334
Submitted: 30 November 2014  Accepted: 29 January 2015   Published: 24 February 2015

Abstract

A huge amount of information had been accumulated on abscisic acid (ABA). Laboratory and some field research with ABA-enhanced transgenic plants generally conclude that ABA is a drought resistance hormone, since it causes stomatal closure, reduces transpiration and results in ‘water saving’ under drought stress. This recurring conclusion is hard to accept in the agronomic domain considering the many direct and indirect negative effects of ABA on plant growth and reproduction. In order to formulate a conceptual phenotypic ABA ideotype for plant breeding, this paper begins by briefly reviewing the phenomics of ABA relative to plant function and productivity. Consequently, it is recognised that ABA enhancement is important in controlling the isohydric (‘water saving’) plant model, whereas plant hydraulics are more important in controlling the anisohydric (‘water spending’) plant model. Subsequently, the respective isohydric and anisohydric ideotypes appropriate to specific dryland crop drought stress scenarios are proposed. It is concluded that ABA can by no means be universally defined as a ‘drought resistance hormone’. Its benefit or damage depends on the crop drought stress profile and the dynamics of the seasonal regimen of ABA in the plant. The isohydric ideotype might have an advantage in the harshest environments, whereas the anisohydric one will perform relatively better under more moderate drought conditions.

Additional keywords: drought resistance, heat stress, osmotic adjustment, stomata, water use efficiency, yield.


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