Starch is the major component of cereal grains. In rice, starch properties determine the eating and cooking quality. The dull endosperm of rice grains is a classical morphological and agronomical trait that has long been exploited for breeding and genetics study. To understand the molecular mechanism that regulates the starch biosynthesis in rice grains, we characterized a classic rice mutant dull endosperm1 (du1) and isolated Du1 through a map-based cloning approach. Du1, encoding a member of pre-mRNA processing (Prp1) family, is expressed mainly in panicles. Du1 specifically affects the splicing efficiency of Wx b and regulates starch biosynthesis by mediating the expression of starch biosynthesis genes. Analysis of du1wx shows that Du1 acts upstream of Wx b . These results strongly suggest that Du1 may function as a regulator of the starch biosynthesis by affecting the splicing of Wx b and the expression of other genes involved in the rice starch biosynthetic pathways.
Plant Molecular Biology – Springer Journals
Published: Jun 20, 2007
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