Journal: Plant Signaling and Behaviour

Abscisic acid (ABA) and key proteins in its perception and signaling pathways are ancient, but their roles have changed through time

Homologs of the Arabidopsis core abscisic acid (ABA) signaling component OPEN STOMATA1 (OST1) are best known for their role in closing stomata in angiosperm species. We recently characterized a fern OST1 homolog, GAMETOPHYTES ABA INSENSITIVE ON ANTHERDIOGEN 1…

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Uprooting an abscisic acid paradigm: Shoots are the primary source

In the past, a conventional wisdom has been that abscisic acid (ABA) is a xylem-transported hormone that is synthesized in the roots, while acting in the shoot to close stomata in response to a decrease in plant water…

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