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Intrageneric phylogeny of Capsella (Brassicaceae) and the origin of the tetraploid C. bursa-pastoris based on chloroplast and nuclear DNA sequences¹

²Evolutionary Functional Genomics, Department of Evolution, Genomics and Systematics, Uppsala University, Norbyvägen 18 D, SE-75236 Uppsala, Sweden; ³Department of Cell and Organism Biology, Lund University, Solvegatan 29, SE-22362 Lund, Sweden; and ⁴Department of Systematic Botany, University of Osnabrück, Barbarastrasse 11, D-49069 Osnabrück, Germany

ABSTRACT

Polyploidization, often accompanied by hybridization, has been of major importance in flowering plant evolution. Here we investigate the importance of these processes for the evolution of the tetraploid crucifer Capsella bursa-pastoris using DNA sequences from two chloroplast loci as well as from three nuclear low-copy genes. The near-absence of variation at the C. bursa-pastoris chloroplast markers suggests a single and recent origin of the tetraploid. However, despite supporting a single phylogeny, chloroplast data indicate that neither of the extant Capsella diploids is the maternal parent of the tetraploid. Combined with data from the three nuclear loci, our results do not lend support to previous hypotheses on the origin of C. bursa-pastoris as an allopolyploid between the diploids C. grandiflora and C. rubella or an autopolyploid of C. grandiflora. Nevertheless, for each locus, some of the C. bursa-pastoris accessions harbored C. rubella alleles, indicating that C. rubella contributed to the gene pool of C. bursa-pastoris, either through allopolyploid speciation or, more likely, through hybridization and introgression. To our knowledge, this study is the first of a wild, nonmodel plant genus that uses a combination of chloroplast and multiple low-copy nuclear loci for phylogenetic inference of polyploid evolution.

Key Words: Adh • Brassicaceae • Capsella • chloroplast DNA sequences • introgression • low-copy nuclear genes • LUMINIDEPENDENS • PISTILLATA

This article has been cited by other articles:

				T. Slotte, H. Huang, M. Lascoux, and A. Ceplitis Polyploid Speciation Did Not Confer Instant Reproductive Isolation in Capsella (Brassicaceae) Mol. Biol. Evol., July 1, 2008; 25(7): 1472 - 1481. [Abstract] [Full Text] [PDF]

				T. Slotte, K. Holm, L. M. McIntyre, U. Lagercrantz, and M. Lascoux Differential Expression of Genes Important for Adaptation in Capsella bursa-pastoris (Brassicaceae) Plant Physiology, September 1, 2007; 145(1): 160 - 173. [Abstract] [Full Text] [PDF]