Proteomics of XXXX seed germination. A comparative study of wild-type and gibberellin-deficient seeds.

@entity958 @entity70273 @entity28970 @entity7726 @entity855
We examined the role of gibberellins (GAs) in germination of @entity958 seeds by a proteomic approach. For that purpose, we used two systems. The first system consisted of seeds of the GA-deficient @entity70273 mutant, and the second corresponded to wild-type seeds incubated in @entity28970 , a specific GA biosynthesis inhibitor. With both systems, radicle protrusion was strictly dependent on exogenous GAs. The proteomic analysis indicated that GAs do not participate in many processes involved in germination sensu stricto (prior to radicle protrusion), as, for example, the initial mobilization of seed protein and lipid reserves. Out of 46 protein changes detected during germination sensu stricto (1 d of incubation on water), only one, corresponding to the cytoskeleton component alpha-2,4 tubulin, appeared to depend on the action of GAs. An increase in this protein spot was noted for the wild-type seeds but not for the @entity70273 seeds incubated for 1 d on water. In contrast, GAs appeared to be involved, directly or indirectly, in controlling the abundance of several proteins associated with radicle protrusion. This is the case for two isoforms of @entity7726 (Ado-Met) synthetase, which catalyzes the formation of Ado-Met from Met and @entity855 . Owing to the housekeeping functions of Ado-Met, this event is presumably required for germination and seedling establishment, and might represent a major metabolic control of seedling establishment. GAs can also play a role in controlling the abundance of a beta-glucosidase, which might be involved in the embryo cell wall loosening needed for cell elongation and radicle extension.
