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Provedor de dados:  Nature Precedings
País:  United Kingdom
Título:  A novel superior factor widely controlling the rice grain quality
Autores:  Kao-Chih She
Hiroaki Kusano
Kazuyoshi Koizumi
Hiromoto Yamakawa
Makoto Hakata
Tomohiro Imamura
Masato Fukuda
Natsuka Naito
Yumi Tsurumaki
Ken'ichiro Matsumoto
Mari Kudoh
Eiko Itoh
Shoshi Kikuchi
Naoki Kishimoto
Junshi Yazaki
Tsuyu Ando
Masahiro Yano
Takashi Aoyama
Tadamasa Sasaki
Hikaru Satoh
Hiroaki Shimada
Data:  2009-05-25
Ano:  2009
Palavras-chave:  Plant Biology
Resumo:  Synthesis of storage starch and protein accumulation is the main action of endosperm organogenesis in term of the economic importance of rice. This event is strongly disturbed by abiotic stresses such as high temperature; thus, the upcoming global warming will cause a crisis with a great impact on food production^1,2^. The enzymes for the protein storage and starch synthesis pathway should work in concert to carry out the organogenesis of rice endosperm^3-5^, but the regulatory mechanism is largely unknown. Here we show that a novel regulatory factor, named OsCEO1, acts as the conductor of endosperm organogenesis during the rice grain filling stage. The physiological properties of _floury-endosperm-2_ (_flo2_) mutants showed many similarities to symptoms of grains developed under high-temperature conditions, suggesting important roles of the responsible gene in sensitivity to high-temperature stress. Our map-based cloning identified the responsible gene for the _flo2_ mutant, _OsCEO1_, which has no homology to any genes of known function. The _OsCEO1_ belongs to a novel conserved gene family and encodes a protein composed of 1,720 amino acid residues containing a TPR (tetratricopeptide repeat) motif, which is considered to mediate a protein-protein interaction. The yeast two-hybrid analysis raised an unknown protein showing homology to a late embryogenesis abundant protein and a putative basic helix-loop-helix protein as candidates for the direct interactor for _OsCEO1_, whereas no enzyme genes for the synthesis of storage substances were detected. The _flo2_ mutant exhibited reduced expression of several genes for putative regulatory proteins as well as many enzymes involved in storage starch and proteins. These results suggest that _OsCEO1_ is a superior conductor of the novel regulatory cascade of endosperm organogenesis and may have important roles in the response to high-temperature stress.
Tipo:  Manuscript
Fonte:  Nature Precedings
Direitos:  Creative Commons Attribution 3.0 License

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