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GrainGenes Reference Report: GNM-45-1157

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Reference	GNM-45-1157
Title	Molecular phylogeny of the genus Hordeum using three chloroplast DNA sequences
Journal	Genome
Year	2002
Volume	45
Pages	1157-1166
Author	Nishikawa T Salomon B Komatsuda T von Bothmer R Kadowaki K
Abstract	Summary: The genus Hordeum consists of three cytotypes (2x, 4x, and 6x). Its reproductive isolation has been incomplete between closely related species and hence. the genetic relationship is reticulate and complex. We used 32 taxa of Hordeum and three chloroplast DNA sequences, matK, atpB-rbcL, and trnL-trnF, in the current study. Molecular phylogenetic analysis based on sequence data of the three chloroplast DNA regions clearly demonstrated genetic relationships among taxa and origin of polyploids. The formation of H. secalinum likely involved hybridization between Hordeum marinum subsp. marinum and a Eurasian diploid possessing the H genome. The formation of hexaploid Hordeum brachyantherum involved hybridization between tetraploid H. brachyantherum and diploid H. marinum subsp. gussoneanum. The formation of three tetraploids, H. brachyantherum, Hordeum jubatum, and Hordeum guatemalense, probably involved hybridization between H. brachyantherum subsp. californicum and an altered H genome diploid. The formation of Hordeum arizonicum involved the two taxa Hordeum pusillum and H. jubatum
External Databases	Pubmed: 12502262
Keyword	[ Hide all but 1 of 25 ] barley canada chloroplast chloroplast dna dna genome genus genus hordeum hexaploid hordeum hybrid hybridization isolation meiosis molecular phylogeny nucleotide sequence origin phylogenetic analysis phylogeny poaceae region sequence sequence data tetraploid vrs1 locus

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