Comparative chromosome pairing in triploids and diploids of perennial Triticeae

Abstract

Meiotic data were obtained for the triploid hybrids Pseudoroegneria libanotica (2n = 14; SS) × P. stipifolia (2n = 28; SSSS), P. spicata (2n = 28; SSSS) × P. spicata (2n = 14; SS), P. strigosa (2n = 28; SSSS) × P. stipifolia (2n = 14; SS) for the first time. Additional polyhaploid plants of Critesion iranicum (2n = 42; HvHvHvHvHvHv) and triploid Hordeum bulbosum (HbHbHb) were also analyzed at metaphase I. The relationships between chromosome association at metaphase I in the autotriploids and in the corresponding diploids of perennial species in the tribe Triticeae were analyzed. The results corroborated the findings in an earlier study that the trivalent frequency in triploids having one or two basic genome(s) is positively correlated with the degree of genome homology in their corresponding diploids. Therefore, chromosome association at metaphase I in diploids is a function of chromosome homology and is a legitimate tool for studying genome relationships.Key words: genome, meiosis, autoploid, alloploid, homology, homoeology.