Updated project metadata. The dehulled rice (Oryza sativa L. japonica. cv. Nipponbare) seeds were washed with distilled water for three times and then imbibed with distilled water in dark growth chamber at 26 °C and 70% relative humidity. About 100 embryos (50 mg) of rice seeds were sliced manually and collected at intervals of 24h after imbibitions (HAI), respectively. After frozen with liquid nitrogen, the samples were stored in −80 °C until used for protein extraction.