大麦与阿根廷披碱草杂种的细胞遗传学研究（n=4x=28）。

Cytogenetics of a Hordeum vulgare x Elymus patagonicus hybrid (n=4x=28).

机构信息

International Maize and Wheat Improvement Center, Londres 40, Apdo., Postal 6-641, 06600, Deleg. Cuauhtemoc, México, D.F., USA.

出版信息

Theor Appl Genet. 1985 Mar;69(5-6):475-9. doi: 10.1007/BF00251087.

DOI:10.1007/BF00251087

PMID:24254001

Abstract

Hordeum vulgare L. (2n=2x=14) was hybridized with Elymus patagonicus Speg. (2n=6x=42). The hybrid had 28 chromosomes, genomically represented as HSH1H2, and was perennial with a codominant phenotype. The chromosomes were meiotically associated as 19.6 univalents + 0.004 ring bivalents + 2.6 rod bivalents + 0.8 trivalents + 0.14 quadrivalents in 1,129 meiocytes, with a chiasma frequency of 4.77 per cell. The bivalent pairing presumably is an autosyndetic but modified expression of the H1H2 genomes of E. patagonicus, since ring bivalents were rare. This does not preclude the association of the H. vulgare H genome chromosomes with either H1 and/or H2 genomes of E. patagonicus to form bivalent or multivalent associations. A further evaluation of the genome homologies of H. vulgare, H. bogdanii, E. canadensis and E. patagonicus is proposed.

摘要

普通大麦（2n=2x=14）与帕拉奎姆偃麦草（2n=6x=42）杂交。杂种有 28 条染色体，基因组表示为 HSH1H2，是多年生的，表现出共显性表型。在 1129 个减数分裂细胞中，染色体减数分裂时形成 19.6 条单价体+0.004 条环二价体+2.6 条棒状二价体+0.8 条三价体+0.14 条四价体，每个细胞的交叉频率为 4.77。二价体配对可能是 E. patagonicus 的 H1H2 基因组的自体联会，但表现形式有所修饰，因为环二价体很少。这并不排除 H. vulgare 的 H 基因组染色体与 E. patagonicus 的 H1 和/或 H2 基因组的关联，从而形成二价体或多价体的关联。因此，建议进一步评估普通大麦、H. bogdanii、E. canadensis 和 E. patagonicus 的基因组同源性。