Meiosis in interspecific Hordeum hybrids. I. Diploid combinations

R. Bothmer, J. Flink, T. Landström
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引用次数: 139

Abstract

The meiotic pairing behaviour of 39 new interspecific combinations between diploid Hordeum species are reported. On the basis of this data, four "basic genomes" are probably present in the genus. Hordeum bulbosum and H. vulgare have the same genome (I); H. marinum ("X") and H. murinum ("Y") each have one distinct genome. All other diploid taxa have either the same or a somewhat modified form of genome H. In this latter group of diploids, the South American taxa together with H. pusillum and H. intercedens in North America constitue a homogeneous group with respect to genomic structure, which differs somewhat from that found in the other Asiatic and North American species. Hordeum roshevitzii from Central Asia is unique, showing high affinity to both the Asiatic and to the American taxa. Evidence suggesting genetic regulation of chromosome pairing (both pairing promoting and pairing reducing) was obtained from a number of the diploid hybrids.Key words: Hordeum, interspecific hybrids, meiosis, diploids.
种间杂交种的减数分裂。1 .二倍体组合
报道了39个二倍体大角蜂种间新组合的减数分裂配对行为。根据这些数据,该属可能存在四个“基本基因组”。球球Hordeum bulbosum和H. vulgare具有相同的基因组(I);H. marinum(“X”)和H. murinum(“Y”)各有一个不同的基因组。所有其他的二倍体类群都有相同的或稍作修饰的基因组h。在后一组二倍体中,南美洲的类群与北美的pusillum和intercedens在基因组结构上构成了一个同质的类群,这与其他亚洲和北美物种的基因组结构有所不同。来自中亚地区的罗什维茨Hordeum roshevitzii是一种独特的植物,与亚洲和美洲的分类群都有很高的亲缘关系。从一些二倍体杂交种中获得了染色体配对的遗传调控(促进配对和减少配对)的证据。关键词:Hordeum,种间杂交,减数分裂,二倍体
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