InterPro domain: IPR039621

This entry represents a group of plant proteins, including BG1 (BIG GRAIN 1) and BIG1L from rice and BG1A-E from Arabidopsis. BG1 over-expressing plants exhibit increased grain size with both bigger length and width. BG1 functions in auxin pathway and positively regulates biomass, grain size and yield in rice [ 1 , 2 ].

1. Activation of Big Grain1 significantly improves grain size by regulating auxin transport in rice. Proc. Natl. Acad. Sci. U.S.A. 112, 11102-7
2. Genome-Wide Identification and Expression, Protein-Protein Interaction and Evolutionary Analysis of the Seed Plant-Specific BIG GRAIN and BIG GRAIN LIKE Gene Family. Front Plant Sci 8, 1812