EQUIVALENCE OF A GENOME OF BREAD WHEAT AND THAT OF TRITICUM-URARTU
EQUIVALENCE OF A GENOME OF BREAD WHEAT AND THAT OF TRITICUM-URARTU
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DOI：
10.1017/s0016672300016244
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发表时间：
1976-01-01
影响因子：
1.5
通讯作者：
RILEY, R
中科院分区：
文献类型：
--
作者：
CHAPMAN, V;MILLER, TE;RILEY, R
T.普通小麦“中国春”（2n = 6x = 42）的A、B染色体组的14条染色体依次为双端着丝粒或双端着丝粒。urartu（2n = 14）。标记的端部着丝粒染色体的行为在从这些授粉获得的14个不同的杂种中进行评分。在6个不同A染色体组的杂种中，有50-80%的花粉母细胞端着丝粒是成对的。在7个标记不同B染色体组染色体的杂种中，端着丝粒从未配对。T. urartu与六倍体小麦的A基因组非常匹配，而与B基因组不对应。研究了14 T.普通小麦T. urartu杂种与早期从T. aestivum和T.植物在T. boeoticum杂种可能是由于同源配对。T. boeoticum可能具有部分抑制小麦染色体5 B的Ph位点活性的能力，其结果是通常阻止同源异源配对。
Lines of T. aestivum ''Chinese Spring'' (2n = 6x = 42), which were ditelocentric or doubly ditelocentric in turn for the 14 chromosomes of the A and B genomes, were pollinated by T. urartu (2n = 14). The behavior of the marked telocentric chromosomes was scored in the 14 distinct hybrids obtained from these pollinations. In 6 of the hybrids in which different A genome chromosomes were marked by telocentrics, there were from 50-80% of the pollen mother cells in which the telocentrics were paired. In the 7 hybrids in which different B genome chromosomes were marked, the telocentrics were never paired. The genome of T. urartu matched very closely the A genome of hexaploid wheat; it did not correspond to the B genome. The pairing behavior of the 14 T. aestivum .times. T. urartu hybrids was compared with earlier results obtained from hybrids between T. aestivum and T. boeoticum. The higher trivalent frequencies seen in the T. boeoticum hybrids could be due to homoeologous pairing. The genotype of T. boeoticum probably has the capacity partly to suppress the activity of the Ph locus of chromosome 5B of wheat, as a result of which homoeologous pairing is normally prevented.