Maternal donors of polyploids in Pseudoroegneria (Poaceae: Triticeae) and related genera inferred from chloroplast trnL-F sequences
To investigate the maternal donors and phylogenetic relationships of polyploids in Pseudoroegneria and related genera, the chloroplast trnL-F sequences of 31 Triticeae accessions were analyzed. The substitution saturation analysis of trnL-F sequences in this study suggested that they are suitable for phylogenetic analysis. In the trnL-F sequences tree, 4 major clades were formed: (a) the St/E clade comprised all of the Pseudoroegneria species together with species in Roegneria, Elytrigia, Douglasdeweya and Lophopyrum; (b) A. cristatum, A. mongolicum, and A. pectinatum subsp. retrofractum formed the P/W clade; (c) the Ns clade included species in Psathyrostachys; and (d) the H clade consisted of Hordeum species. The results suggested that: (a) diploid Pseudoroegneria species were the maternal donors of St-containing polyploid species in Pseudoroegneria, Roegneria, Douglasdeweya, and Elytrigia, and the trnL-F sequences were highly similar among them; (b) the trnL-F sequences of Agropyron species and Australopyrum species were similar, and the P genome was closely related to the W genome; and (c) the trnL-F sequences of species with the H or Ns genomes diverged greatly from that of species with the St, E, P, or W genomes.
Maternal donors of polyploids in Pseudoroegneria (Poaceae: Triticeae) and related genera inferred from chloroplast trnL-F sequences
To investigate the maternal donors and phylogenetic relationships of polyploids in Pseudoroegneria and related genera, the chloroplast trnL-F sequences of 31 Triticeae accessions were analyzed. The substitution saturation analysis of trnL-F sequences in this study suggested that they are suitable for phylogenetic analysis. In the trnL-F sequences tree, 4 major clades were formed: (a) the St/E clade comprised all of the Pseudoroegneria species together with species in Roegneria, Elytrigia, Douglasdeweya and Lophopyrum; (b) A. cristatum, A. mongolicum, and A. pectinatum subsp. retrofractum formed the P/W clade; (c) the Ns clade included species in Psathyrostachys; and (d) the H clade consisted of Hordeum species. The results suggested that: (a) diploid Pseudoroegneria species were the maternal donors of St-containing polyploid species in Pseudoroegneria, Roegneria, Douglasdeweya, and Elytrigia, and the trnL-F sequences were highly similar among them; (b) the trnL-F sequences of Agropyron species and Australopyrum species were similar, and the P genome was closely related to the W genome; and (c) the trnL-F sequences of species with the H or Ns genomes diverged greatly from that of species with the St, E, P, or W genomes.
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- 1. Löve Á. IOPB chromosome number reports. LXVI. PoaceaeTriticeae-Americanae. Taxon 29: 163-169, 1980.
- 2. Löve Á. Conspectus of the Triticeae. Feddes Repert 95: 425-521, 1984. 3. Dewey DR. The genomic system of classification as a guide to intergeneric hybridization with the perennial Triticeae. In: Gustafson JP. ed. Gene Manipulation in Plant Improvement. Plenum Press. New York; 1984: pp. 209-280.
- 4. Yen C, Yang JL. Kengyilia gobicola, a new taxon from west China. Can J Bot 68: 1894-1987, 1990.
- 5. Yen C, Yang JL, Baum BR. Douglasdeweya: a new genus, with a new species and a new combination (Triticeae: Poaceae). Can J Bot 83: 413-419, 2005.
- 6. Yen C, Yang JL, Yen Y. Hitoshi Kihara, Áskell Löve and the modern genetic concept of the genera in the tribe Triticeae (Poaceae). Acta Phytotax Sin 43: 82-93, 2005.
- 7. Hsiao C, Chatterton NJ, Asay KH et al. Phylogenetic relationships of the monogenomic species of the wheat tribe, Triticeae (Poaceae), inferred from nuclear rDNA (internal transcribed spacer) sequences. Genome 38: 221-223, 1995.
- 8. Wang RRC, Dewey DR, Hsiao C. Genome analysis of the tetraploid Pseudoroegneria tauri. Crop Sci 26: 723-727, 1986.
- 9. Jensen KB, Hatch SL, Wipff JK. Cytology and morphology of Pseudoroegneria deweyi (Poaceae: Triticeae): a new species from the foot hills of the Caucasus Mountains (Russia). Can J Bot 70: 900-909, 1992.
- 10. Liu ZW, Wang RRC. Genome analysis of Elytrigia caespitosa, Lophopyrum nodosum, Pseudoroegneria geniculata ssp. scythica, and Thinopyrum intermedium (Triticeae: Gramineae). Genome 36: 102-111, 1993.
- 11. Baum BR, Yen C, Yang JL. Roegneria: its generic limits and justification for its recognition. Can J Bot 69: 282-294, 1991.
- 12. Wang RRC, Bothmer RV, Dvorak J et al. Genome symbols in the Triticeae (Poaceae). In: Wang RRC, Jensen KB, Jaussi C. eds. Proceedings of the 2nd International Triticeae Symposium. Utah, USA. Utah State University, Utah; 1994: pp. 29-34.
- 13. Keng YL, Chen SL. A revision of the genus Roegneria C. Koch in China. Acta Nanjing Univ 3: 1-92, 1963.
- 14. Yen C, Yang JL. A new species of Roegneria from Xizang (Tibet). Acta Bot Yunnan 6: 75-76, 1984.
- 15. Cui DF. New taxa of Elymus L. from Xinjiang. Bull Bot Res 10: 25-38, 1990.
- 16. Cai LB. A taxonomical study on the genus Roegneria C. Koch from China. Acta Phytotax Sin 35: 148-177, 1997.