Allozyme variation in Mexican species and classification of Datura (Solanaceae)

摘要: Fifty natural Datura populations, belonging to eleven species (D. ceratocaula, D. discolor, inoxia, kymatocarpa, lanosa, metel, pruinosa, quercifolia, reburra, stramonium, wrightii) from Mexico and adjacent USA, were investigated using starch gel electrophoresis. A total of 64 alleles scored at 17 loci (DIA1, DIA2, GOT1, GOT2, G6PDH, IDH, MDH1, MDH2, MDH3, ME, PGD1, PGD2, PGM1, PGM2, PHI, SAD, SOD). The heterozygosity among the ranged 0.166 ceratocaula) 0.276 wrightii). Most genetic diversity was found within populations (average Hs=0.242), while values between are relatively low Dst=0.066, Gst=0.171). analysis distance suggested new taxonomic relationships species. Rather than supporting conventional infrageneric classification with three sections, results revealed that herbaceous members genus form four groups. One group included eight section Dutra more similar Ceratocaulis it other contained remaining taxa Dutra.