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Plant Cell, Vol. 11, 1433-1444, August 1999, Copyright © 1999, American Society of Plant Physiologists
Molecular Analysis of the anthocyanin2 Gene of Petunia and Its Role in the Evolution of Flower Color
Francesca Quattrocchioa,
John Winga,
Karel van der Woudea,
Erik Souera,
Nick de Vettena,
Joseph Mola, and
Ronald Koesa
a Department of Genetics, Institute for Molecular Biological Sciences, Vrije Universiteit, BioCentrum Amsterdam, de Boelelaan 1087, 1081 HV Amsterdam, The Netherlands
Correspondence to:
Ronald Koes, koes{at}bio.vu.nl (E-mail), 31-20-444-7155 (fax)
The shape and color of flowers are important for plant reproduction because they attract pollinators such as insects and birds. Therefore, it is thought that alterations in these traits may result in the attraction of different pollinators, genetic isolation, and ultimately, (sympatric) speciation. Petunia integrifolia and P. axillaris bear flowers with different shapes and colors that appear to be visited by different insects. The anthocyanin2 (an2) locus, a regulator of the anthocyanin biosynthetic pathway, is the main determinant of color differences. Here, we report an analysis of molecular events at the an2 locus that occur during Petunia spp evolution. We isolated an2 by transposon tagging and found that it encodes a MYB domain protein, indicating that it is a transcription factor. Analysis of P. axillaris subspecies with white flowers showed that they contain an2- alleles with two alternative frameshifts at one site, apparently caused by the insertion and subsequent excision of a transposon. A third an2- allele has a nonsense mutation elsewhere, indicating that it arose independently. The distribution of polymorphisms in an2- alleles suggests that the loss of an2 function and the consequent changes in floral color were not the primary cause for genetic separation of P. integrifolia and P. axillaris. Rather, they were events that occurred late in the speciation process, possibly to reinforce genetic isolation and complete speciation.
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