Phylogeny of the StH genome species in Triticeae (Poaceae): Evidence from chloroplast trnL-F and mitochondria COXII intron sequences

Abstract

The StH genome species in Triticeae exhibit different morphological variations and extensive geographic distribution. To estimate the phylogenetic relationship of the StH genome species in Triticeae, mitochondria COXII intron and chloroplast trnL-F sequences of 16 StH genome species were analyzed with those of four Pseudoroegneria species (St) and four Hordeum species (H). Sequence diversity and genealogical analysis suggested that (1) the trnL-F and COXII sequence may evolve faster in the polyploid species than in the diploids; (2) the COXII intron has a high evolutionary rate compared to trnL-F sequence and would provide potentially useful phylogenetic analysis in the StH genome species; (3) different Pseudoroegneria species might serve as the maternal donor during the polyploid speciation of the StH genome species; (4) phylogenetic relationships of the StH genome species may be not linked with the inter-continental disjunction between Eurasian and North American. ► The trnL-F and COXII intron sequences of 16 StH genome species were analyzed with those of putative diploid donor species. ► The trnL-F and COXII sequence may evolve faster in the polyploid species than in the diploids. ► The COXII has a high evolutionary rate compared to trnL-F sequence. ► Different St genome donor might serve as the maternal donor during the polyploid speciation. ► Phylogenetic relationships of the StH genome species may be not linked with the inter-continental disjunction between Eurasia and North America.