The origins of polyploids in western North American fawn-lilies (Erythronium) 1

摘要: Two rare tetraploid fawn-lilies, Erythronium elegans P.C. Hammond & K.L. Chambers in western Oregon and quinaultense G.A. Allen northwestern Washington, are hypothesized to be of hybrid origin, on the basis morphological evidence. I tested these hypotheses using DNA sequences nuclear ribosomal ITS region two plastid intergenic spacer regions (trnH-psbA trnS-trnG) from tetraploids five relevant diploid taxa. indicated that low-elevation species revolutum Sm. oregonum Apple- gate recently diverged, gave rise (at least part) tetraploids. Both E. yielded multiple chloroplast haplotypes were distinct types. One haplotype found both (four populations) (one population) exactly matched most common revolutum; other (two similar those oregonum. These results consistent with derivation genomes different polyploid popula- tions either or (or their respective recent ancestors), suggest recurrent formation each species. The examples allopolyploid which molecular evidence origins striking contrast, reflecting very aspects genomes.