Abstract
It has been well established that the scutellar tissues play the important roles for the breakdown and uptake/utilization of storage starch in germinating rice seeds. Previously, we described about the initial proteomic analysis of abundant proteins expressed in the scutellar tissues. Here, we report the proteomic identification of time-dependent increased and abscisic acid (ABA)-induced proteins in the scutellar tissues. Glycolytic enzymes, TCA cycle-ATP producing enzymes, sucrose synthesis-related enzymes and ABA-inducible proteins were identified as the scutellar proteins increased during 6 days germination. ABA treatment caused a significant increase of dry weight and protein contents of the scutellar tissues. Most of the ABA-induced proteins detected were identical to the time-dependent increased enzyme proteins. Based on these results, we considered that ABA stimulates a function of the scutellum of germinating rice seeds. We also mention about the results obtained by the analysis of rice viviparous mutants.
