conference schedule and program with abstracts - Horticulture ...

P-20
Characterization of key components associated with the hormone signaling pathway that
initiates berry ripening
L. Deluc
Department of Horticulture Agriculture and Life Sciences Building Oregon State University
Corresponding author: delucl@hort.oregonstate.edu
Grape berry ripening is a complex biological process, which is predominately controlled by
cross-talk between different hormones and sugars. Abscisic acid (ABA) is thought to play the
prominent role in the control of the onset of ripening (véraison stage). However, the precise role
of ABA in the signal transduction is still poorly understood at the protein level. Recently, there
are numerous lines of evidence suggesting that ABA is not the only actor in the initiation of
berry ripening. Amongst several other candidates, jasmonate (JA) is believed to be one of them
in the interplay involving ABA and sugars at véraison stage. Recent transcriptomic data indicate
that key components of the JA signal transduction were up-regulated in grape berry throughout
its development and under water deficit conditions. Recent advances in the ABA and JA signal
transduction in plant model systems will be used to develop a comprehensive approach in grape
berry i) to identify orthologous ABA and jasmonate signaling proteins occurring at véraison
stage, ii) to determine correlations between the accumulation of ABA and JA, and their
derivatives at the onset of berry ripening, iii) to assess the synergistic effects of JA, ABA and
sugars in enhancing berry ripening throughout analytical profiles in grape cell culture.
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