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J Plant Res. 2011 Mar;124(2):299-304. doi: 10.1007/s10265-010-0369-7. Epub 2010 Aug 3.

The molecular basis of incomplete dominance at the A locus of CHS-D in the common morning glory, Ipomoea purpurea.

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Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-Ku, Shizuoka 422-8526, Japan.


The mutable a(flaked (a(f)) allele at the A locus of the common morning glory (Ipomoea purpurea) confers incomplete dominance in flower pigmentation and is caused by insertion of the DNA transposon Tip100 into CHS-D, which encodes chalcone synthase and is required for anthocyanin biosynthesis. Levels of CHS-D transcripts, CHS-D protein, and anthocyanin pigment in heterozygous flowers were about half that in homozygous flowers, indicating that dosage-dependent expression of CHS-D is the primary cause of the observed incomplete dominance. This contrasts with the Nivea locus in snapdragon (Antirrhinum majus) in which incomplete dominance is caused by semi-dominant CHS alleles.

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