Journal Article

A Novel Kinesin 13 Protein Regulating Rice Seed Length

Kanako Kitagawa, Shigeru Kurinami, Katsuyuki Oki, Yuki Abe, Tsuyu Ando, Izumi Kono, Masahiro Yano, Hidemi Kitano and Yukimoto Iwasaki

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 8, pages 1315-1329
Published in print August 2010 | ISSN: 0032-0781
Published online June 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq092
A Novel Kinesin 13 Protein Regulating Rice Seed Length

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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The causal gene of a novel small and round seed mutant phenotype (srs3) in rice was identified by map-based cloning and named the SRS3 gene. The SRS3 gene was grouped as a member of the kinesin 13 subfamily. The SRS3 gene codes for a protein of 819 amino acids that contains a kinesin motor domain and a coiled-coil structure. Using scanning electron microscopy, we determined that the cell length of seeds in the longitudinal direction in srs3 is shorter than that in the wild type. The number of cells of seeds in the longitudinal direction in srs3 was not very different from that in the wild type. The result suggests that the small and round seed phenotype of srs3 is due to a reduction in cell length of seeds in the longitudinal direction. The SRS3 protein, which is found in the crude microsomal fraction, is highly expressed in developing organs.

Keywords: Cell elongation; Kinesin; Map-based cloning; Rice; Small and round seed

Journal Article.  7793 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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