Journal
PLANT CELL REPORTS
Volume 38, Issue 3, Pages 345-359Publisher
SPRINGER
DOI: 10.1007/s00299-019-02370-9
Keywords
Rice.endosperm; FLOURY; ENDOSPERM 15; Glyoxalase I; Starch synthesis.compound granule
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Funding
- Key Laboratory of Biology, Genetics and Breeding of Japonica Rice in Mid-lower Yangtze River, Ministry of Agriculture, P. R. China
- Jiangsu Collaborative Innovation Center for Modern Crop Production
- National Key Research and Development Program of China [2017YFD0100404]
- Jiangsu Science and Technology Development Program [BE2015355-1, BE2017368]
- Agricultural Science and Technology Innovation Fund project of Jiangsu Province [CX(16)1029]
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Key messageFLO15encodes a plastidic glyoxalase I protein, OsGLYI7, which affects compound starch granule formation and starch synthesis in rice endosperm.AbstractStarch synthesis in rice (Oryza sativa) endosperm is a sophisticated process, and its underlying molecular machinery still remains to be elucidated. Here, we identified and characterized two allelic rice floury endosperm 15 (flo15) mutants, both with a white-core endosperm. The flo15 grains were characterized by defects in compound starch granule development, along with decreased starch content. Map-based cloning of the flo15 mutants identified mutations in OsGLYI7, which encodes a glyoxalase I (GLYI) involved in methylglyoxal (MG) detoxification. The mutations of FLO15/OsGLYI7 resulted in increased MG content in flo15 developing endosperms. FLO15/OsGLYI7 localizes to the plastids, and the in vitro GLYI activity derived from flo15 was significantly decreased relative to the wild type. Moreover, the expression of starch synthesis-related genes was obviously altered in the flo15 mutants. These findings suggest that FLO15 plays an important role in compound starch granule formation and starch synthesis in rice endosperm.
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