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Segami S, Kono I, Ando T, Yano M, Kitano H, Miura K, Iwasaki Y. Small and round seed 5 gene encodes alpha-tubulin regulating seed cell elongation in rice. RICE (NEW YORK, N.Y.) 2012; 5:4. [PMID: 24764504 PMCID: PMC3834490 DOI: 10.1186/1939-8433-5-4] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 02/27/2012] [Indexed: 05/20/2023]
Abstract
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.
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Affiliation(s)
- Shuhei Segami
- Faculty of Biotechnology, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka, Eiheiji-Town, Fukui 910-1195, Japan
| | - Izumi Kono
- 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
| | - Tsuyu Ando
- Institute of the Society for Techno-innovation of Agriculture, Forestry and Fisheries, 446-1 Ippaizuka, Kamiyokoba, Tsukuba, Ibaraki 305-0854, Japan
- National Institute of Agrobiological Science, 2-1-1 Kannondai, Tsukuba, Ibaraki 305-8602, Japan
| | - Masahiro Yano
- National Institute of Agrobiological Science, 1-2 Ohwashi, Tsukuba, Ibaraki 305-8634 Japan
| | - Hidemi Kitano
- Bioscience and Biotechnology Center, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Kotaro Miura
- Faculty of Biotechnology, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka, Eiheiji-Town, Fukui 910-1195, Japan
| | - Yukimoto Iwasaki
- Faculty of Biotechnology, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka, Eiheiji-Town, Fukui 910-1195, Japan
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