Characterization and Effects of the Replicated Flowering Time Gene <i>FLC</i> in <i>Brassica rapa</i>

DOI PDF 被引用文献15件
  • M Eric Schranz
    Department of Agronomy, University of Wisconsin, Madison, Wisconsin 53706
  • Pablo Quijada
    Department of Agronomy, University of Wisconsin, Madison, Wisconsin 53706
  • Si-Bum Sung
    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706
  • Lewis Lukens
    Department of Agronomy, University of Wisconsin, Madison, Wisconsin 53706
  • Richard Amasino
    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706
  • Thomas C Osborn
    Department of Agronomy, University of Wisconsin, Madison, Wisconsin 53706

説明

<jats:title>Abstract</jats:title> <jats:p>Functional genetic redundancy is widespread in plants and could have an important impact on phenotypic diversity if the multiple gene copies act in an additive or dosage-dependent manner. We have cloned four Brassica rapa homologs (BrFLC) of the MADS-box flowering-time regulator FLC, located at the top of chromosome 5 of Arabidopsis thaliana. Relative rate tests revealed no evidence for differential rates of evolution and the ratios of nonsynonymous-to-synonymous substitutions suggest BrFLC loci are not under strong purifying selection. BrFLC1, BrFLC2, and BrFLC3 map to genomic regions that are collinear with the top of At5, consistent with a polyploid origin. BrFLC5 maps near a junction of two collinear regions to Arabidopsis, one of which includes an FLC-like gene (AGL31). However, all BrFLC sequences are more closely related to FLC than to AGL31. BrFLC1, BrFLC2, and BrFLC5 cosegregate with flowering-time loci evaluated in populations derived by backcrossing late-flowering alleles from a biennial parent into an annual parent. Two loci segregating in a single backcross population affected flowering in a completely additive manner. Thus, replicated BrFLC genes appear to have a similar function and interact in an additive manner to modulate flowering time.</jats:p>

収録刊行物

  • Genetics

    Genetics 162 (3), 1457-1468, 2002-11-01

    Oxford University Press (OUP)

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