ABA and the Floral Transition - Abscisic Acid: Metabolism, Transport and Signaling - page 367

of these early phosphorylation events, the evidence reviewed here suggests that
ABA activates a complex network of transcription factors, some of which hav-
ing opposing function in flowering. A more precise understanding of the early
downstream targets of ABA signalling as well as the regulatory logic of the ABA-
related network of transcription factors warrant further investigations.
Recent advancements in hormone signalling reveal how their site of production,
mode of transport and action is strictly controlled; ABA may thus be no exception.
A key goal is therefore to have a better understanding of the spatial context where
ABA acts (perhaps in combination with other hormones) during vegetative devel-
opment. Spatial and temporal constraints might affect the final output of ABA sig-
nalling. Tissue specific and temporal manipulation of ABA signalling could inform
the nature of these constraints. Knowledge obtained through these experiments
will provide concepts that help to understand how enormously variable water-
dependent signals are translated into developmental adaptations in plants.
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