Homoeologous relationships of Aegilops speltoides chromosomes to bread wheat
Homoeologous relationships of Aegilops speltoides chromosomes to bread wheat
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DOI：
10.1007/s001220050883
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发表时间：
1998-07-01
影响因子：
5.4
通讯作者：
Naranjo, T
中科院分区：
文献类型：
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作者：
Maestra, B;Naranjo, T
对aestivum （AABBDD）和Aegilops speltoides （SS）的标准型、ph2b和ph1b杂交进行了中期同源配对分析。利用相对配对亲和度数据预测伊蚊的同源关系。小麦的球茎染色体。这两个物种的染色体和它们的前肢都通过c带进行了鉴定。Ae。Speltoides基因型在三种杂交品种中均携带诱导高水平同源配对的基因。S基因组的7条染色体臂均呈现正常的同源配对，说明伊蚊在进化过程中未发生明显的染色体重排。与小麦有关的球茎。A- d和B-S两种类型的优先配对模式证实了S基因组与小麦B基因组的亲缘关系非常密切。虽然这种配对模式在小麦与伊蚊杂交中也有报道。longissima和Ae。Sharonensis，在第5组染色体上发现了不同的行为。在伊蚊的杂交体中。其中，5B-5S染色体配对频率明显高于5D-5S染色体配对频率；longissima和Ae。sharonensis。这些结果与小麦B基因组来源于Ae的假设是一致的。speltoides。
Homoeologous pairing at metaphase I was analysed in the standard-type, ph2b and ph1b hybrids of Triticum aestivum (AABBDD) and Aegilops speltoides (SS). Data from relative pairing affinities were used to predict homoeologous relationships of Ae. speltoides chromosomes to wheat. Chromosomes of both species, and their arms, were identified by C-banding. The Ae. speltoides genotype carried genes that induced a high level of homoeologous pairing in the three types of hybrids analyzed. All arms of the seven chromosomes of the S genome showed normal homoeologous pairing, which implies that no apparent chromosome rearrangements occurred in the evolution of Ae. speltoides relative to wheat. A pattern of preferential pairing of two types, A-D and B-S, confirmed that the S genome is very closely related to the B genome of wheat. Although this pairing pattern was also reported in hybrids of wheat with Ae. longissima and Ae. sharonensis, a different behaviour was found in group 5 chromosomes. In the hybrids of Ae. speltoides, chromosome 5B-5S pairing was much more frequent than 5D-5S, while these chromosome associations reached similar frequencies in the hybrids of Ae. longissima and Ae. sharonensis. These results are in agreement with the hypothesis that the B genome of wheat is derived from Ae. speltoides.