Portal de Periódicos da CAPES

Small and round seed 5 gene encodes alpha-tubulin regulating seed cell elongation in rice

2012; Springer Science+Business Media; Volume: 5; Issue: 1 Linguagem: Inglês

10.1186/1939-8433-5-4

1939-8433

Shuhei Segami, Izumi Kono, Tsuyu Ando, Masahiro Yano, Hidemi Kitano, Kotaro Miura, Yukimoto Iwasaki,

Plant Molecular Biology Research

Seed size is an important trait in determinant of rice seed quality and yield. In this study, we report a novel semi-dominant mutant Small and round seed 5 (Srs5) that encodes alpha-tubulin protein. Lemma cell length was reduced in Srs5 compared with that of the wild-type. Mutants defective in the G-protein alpha subunit (d1-1) and brassinosteroid receptor, BRI1 (d61-2) also exhibited short seed phenotypes, the former due to impaired cell numbers and the latter due to impaired cell length. Seeds of the double mutant of Srs5 and d61-2 were smaller than those of Srs5 or d61-2. Furthermore, SRS5 and BRI1 genes were highly expressed in Srs5 and d61-2 mutants. These data indicate that SRS5 independently regulates cell elongation of the brassinosteroid signal transduction pathway.