Faculty of Biotechnology, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka, Eiheiji-Town, Fukui 910-1195, Japan.
Institute of the Society for Techno-innovation of Agriculture, Forestry and Fisheries, 446-1 Ippaizuka, Kamiyokoba, Tsukuba, Ibaraki 305-0854, Japan ; Laboratory of Synaptic Plasticity and Connectivity RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
Rice (N Y). 2012 Feb 27;5(1):4. doi: 10.1186/1939-8433-5-4. eCollection 2012.
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.
种子大小是决定水稻种子质量和产量的重要特征。本研究报道了一个新的半显性突变体 Small and round seed 5（Srs5），它编码微管蛋白。与野生型相比，Srs5 的外稃细胞长度减小。G 蛋白 α 亚基缺陷型（d1-1）和油菜素内酯受体 BRI1 缺陷型（d61-2）突变体也表现出短种子表型，前者是由于细胞数量减少，后者是由于细胞长度减少。Srs5 和 d61-2 双突变体的种子比 Srs5 或 d61-2 的种子更小。此外，SRS5 和 BRI1 基因在 Srs5 和 d61-2 突变体中高度表达。这些数据表明，SRS5 独立调节油菜素内酯信号转导途径的细胞伸长。
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