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Molecular Data Indicate Complex Intra- and Intercontinental Differentiation of American Draba (Brassicaceae)

2002; Missouri Botanical Garden; Volume: 89; Issue: 1 Linguagem: Inglês

10.2307/3298659

2162-4372

Marcus A. Koch, Ihsan A. Al‐Shehbaz,

Natural product bioactivities and synthesis

The genus Draba -about 350 species -ү in the Northern Hemisphere, with some 80 species described morphologic rally, the existing sectional iong species of in South and Central America.Although spec ies of Dr are well classification is -controversial.American taxa e hib it enormous morphological differences even an d the hypothesis that variation accum ul; ated during migration and i ien of American "the ITS (internal transcribed spacer) regions of the 72 nien; 'an gue taxa and 6Mi primarily to pru n TI the same section.We teste Draba.The present "eme netic study i nuclear ribosomal DNA and we chloroplast trn L-intron and spacer sequences froi European Draba species.Resul some intrageneric groupings corre and that only to a small degree do -findings agree with previous sec -classific 'ation.Differences betw 'Sed between some of the groups or sections ITS sequence zu lastid DNA y the American Draba ^2is based on analyses ts suggest that s and trnL-derived phylogenies suggest extensive genetic contact may have exis and that this disjunction = tween К uropean and American -is de ш ы һу sequences suggest | that "European" plastome types be more widely distributed among species, perhaps et -transmissions of Eurasian n chloroplast types d American Draba.Additional systematic analysis demonstrates that the genus Erophila has to be integrated into Analysis on the tribal level -the entire Draba complex to be close to European Arabis and Aubrieta.The data provide additional support for evious assumptions that the existing tribal classifications of the Brassicaceae are mostly artificial and that the segre sharin of Draba and Arabis into separate tribes or subtribes does not accurately reflect their phylogenetic relationship.Draba.