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Developing gene-tagged molecular markers for functional analysis of starch-synthesizing genes in rice (Oryza sativa L.)

Tipo de material: TextoTextoSeries ; Euphytica , 135(3), p.345-353, 2004Trabajos contenidos:
  • Liu, X
  • Gu, M
  • Han, Y
  • Qing, J
Tema(s): Recursos en línea: Resumen: The granule-bound starch synthase(GBSS), starch branching enzymes 1 (SBE1)and 3 (SBE3)are major enzymes involved instarch biosynthesis in rice endosperm.Available sequences of Sbe1 and Sbe3 genes encoding corresponding SBE1 andSBE3 have been used to identify homologousregions from genome databases of both theindica rice 93-11 and the japonica rice Nipponbare. Sequencediversities were exploited to developgene-tagged markers to distinguish an indica allele from a japonica allelefor both Sbe1 and Sbe3 loci. With these newly developed gene-taggedmarkers and available Wx genemarkers, the roles of thesestarch-synthesizing genes (Sbe1, Sbe3, and Wx)in determining amylosecontent (AC)in the rice endosperm wereevaluated using a double-haploid (DH)population derived from a cross between theindica rice cv. Nanjing11 and thejaponica rice cv. Balilla. Only theWx and Sbe3 loci hadsignificant effects on the AC variation. On average, indica Wx a genotypes showed 9.1
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The granule-bound starch synthase(GBSS), starch branching enzymes 1 (SBE1)and 3 (SBE3)are major enzymes involved instarch biosynthesis in rice endosperm.Available sequences of Sbe1 and Sbe3 genes encoding corresponding SBE1 andSBE3 have been used to identify homologousregions from genome databases of both theindica rice 93-11 and the japonica rice Nipponbare. Sequencediversities were exploited to developgene-tagged markers to distinguish an indica allele from a japonica allelefor both Sbe1 and Sbe3 loci. With these newly developed gene-taggedmarkers and available Wx genemarkers, the roles of thesestarch-synthesizing genes (Sbe1, Sbe3, and Wx)in determining amylosecontent (AC)in the rice endosperm wereevaluated using a double-haploid (DH)population derived from a cross between theindica rice cv. Nanjing11 and thejaponica rice cv. Balilla. Only theWx and Sbe3 loci hadsignificant effects on the AC variation. On average, indica Wx a genotypes showed 9.1

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