著者

佐野 順一 田中 正武

出版者

Genetics Society of Japan

雑誌

遺伝学雑誌 (ISSN:0021504X)

巻号頁・発行日

vol.55, no.1, pp.9-17, 1980

被引用文献数

3

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In order to estimate chromosomal homology between <i>Aegilops</i> <i>speltoides</i> (genomic constitution SS) and the tetraploid wheats (AABB or AAGG), effects of the B-chromosomes and genotypes of <i>Ae. speltoides</i> on chromosome pairing at MI of meiosis in F₁ hybrids of <i>Ae. speltoides</i> × tetraploid wheats were investigated.<br>In hybrids with B's, chromosome pairing was strikingly affected by the B's and very small amount of pairing was observed. In hybrids without B's, however, extensive pairing was observed, although the amount of pairing varied due to the <i>speltoides</i> genotypes involved. In these hybrids with or without B's, although some minor yet distinctive differences in pairing attributable to the kind of genomic constitution of the wheat parent were observed in the multivalent frequency and in the distribution (or terminalization) of chiasmata, both hybrids with different genomic constitution (SAB or SAG) had essentially the same amount of pairing. Since the B-chromosomes used did not cause asynapsis (or desynapsis) of homologous chromosomes in <i>Ae. speltoides</i>, the pairing reduced by the presence of B's in the hybrids does not seem to be homologous and is probably homoeologous. Therefore, it can be concluded that there is little chromosomal homology between <i>Ae. speltoides</i> and both tetraploid wheats of genomic constitution AABB and AAGG.