TITLE

Molecular phylogeny and reticulate origins of several American polyploid Hordeum species

AUTHOR(S)
Wang, Huan; Sun, Genlou
PUB. DATE
June 2011
SOURCE
Botany;Jun2011, Vol. 89 Issue 6, p405
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The phylogeny of diploid species in the genus has been studied intensively. Although the origin of American polyploid species has been analyzed using multiple-copy internal transcribed spacer sequences, the origins of these species in Hordeum remain unclear. The objectives of our study were to elucidate the origins of American polyploid species and to explore phylogenetic relationships of these polyploids to diploid Hordeum and other diploid species in Triticeae using a single copy of a nuclear gene, disrupted meiotic cDNA1 ( DMC1). DMC1 sequences from nine Hordeum polyploid species were analyzed. Sequence comparisons revealed that one copy of sequences from polyploid species , , and showed a 82 bp miniature inverted-repeat terminal element (MITE) ( Stowaway) insertion, which was also detected in the Triticeae diploid species species (W genome) and (Ta genome). Maximum parsimony and Bayesian analysis suggested that diploid subsp. is one ancestor of polyploids , H. brachyantherum subsp. , , and . The other ancestor of tetraploid H. depressum is probably . Hordeum cordobense was suggested to be one of the genome donors to hexaploid H. procerum. The diploid and tetraploid H. tetraploidum were suggested as the parents to hexaploid species . The result is that one sequence from each of three Hordeum tetrapolyploids, including H. fuegianum, H. jubatum, and H. tetraploidum, and one from Hordeum hexaploid H. arizonicum fall outside the Hordeum clade of the DMC1 phylogenetic tree, therefore representing another example of complex evolutionary history. Our data may shed light on future phylogenetic studies in Triticeae, especially for the polyploids, by broadening the scope of investigations through sampling more genome types in Poaceae, not only from the tribe Triticeae.
ACCESSION #
65536833

 

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