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- W2108184512 abstract "Apomictic complexes in flowering plants often harbor multiple sexual taxa, which must be studied to interpret accurately the origin and diversity of apomictic derivatives. The daisy fleabane group in North America ( Erigeron sect. Phalacroloma ) includes the widespread polyploid apomictic taxa E . annuus , E . strigosus , and E . tenuis , as well as recently discovered sexual diploid populations in the southeastern United States ( E . strigosus var. calcicola , E . strigosus var. dolomiticola, sexual E . strigosus var. strigosus ). Phylogenetic analysis for 35 sexual populations was conducted using sequences from the internal and external transcribed spacers (ITS and ETS) of ribosomal DNA. Results indicate that the three groups of sexual plants form separate monophyletic clades and that edaphic specialization is ancestral in the group. Sequence analysis for sexual E . strigosus var. strigosus was confounded by the fact that 13 of 31 samples (42%) possessed nucleotide polymorphisms at 1.0–1.8% of sites. However, analysis of the genomic sequence for plants with low polymorphism levels in conjunction with analysis of cloned PCR products for plants with high levels of intra‐individual polymorphism indicated that three combinations of haplotypes (N I + N II, two plants; N I + N III, five plants; N II + N III, six plants) accounted for the majority of sequence polymorphisms encountered. These data are consistent with historical diversification and subsequent reticulate evolution at the diploid level in sexual E . strigosus var. strigosus ." @default.
- W2108184512 created "2016-06-24" @default.
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- W2108184512 date "2006-03-01" @default.
- W2108184512 modified "2023-10-17" @default.
- W2108184512 title "Intraspecific nuclear ribosomal DNA divergence and reticulation in sexual diploid Erigeron strigosus (Asteraceae)" @default.
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- W2108184512 doi "https://doi.org/10.3732/ajb.93.3.470" @default.
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