Meiotic analysis of the interspecific and intergeneric hybrids between Hystrix patula Moench and H. duthiei ssp. longearistata, Pseudoroegneria, Elymus, Roegneria, and Psathyrostachys species (Poaceae, Triticeae).

摘要

Interspecific and intergeneric hybridizations were carried out in an investigation of genome homology between Hystrix patula and other species of Hystrix, as well as the generic relationships between H. patula and its related species. Meiotic pairing in the hybrids H. patula x H. duthiei ssp. longearistata (Ns-), H. patula x Pseudoroegneria spicata (St), H. patula x Pse. libanotica (St), Elymus sibiricus (StH) x H. patula, H. patula x E. wawawaiensis (StH), Roegneria ciliaris (StY) x H. patula, H. patula x R. grandis (StY), and H. patula x Psathyrostachys huashanica (Nsh) averaged 1.32, 6.53, 5.62, 10.08, 12.83, 3.57, 3.98, and 0.29 bivalents per cell, respectively. The results indicate that: (1) H. patula has no genome homology with H. duthiei ssp. longearistata or the Ns genome from Psathyrostachys; (2) H. patula contains the same StH genomes as the Elymus species, and the St genome is homologous to the genome of Pse. spicata and Pse. libanotica; and (3) H. patula has a low genome affinity with the StY genomes of Roegneria. Therefore, it is reasonable to treat H. patula Moench as E. hystrix L..