小麦-簇毛麦端体附加系中6VS的细胞遗传学行为及其抗性遗传研究

小麦 -簇毛麦 6VS端体附加系AD134抗白粉病特性受 6VS上基因的控制 ,在不同小麦背景下都能充分表达。单体附加的 6VS抑制小麦染色体正常配对 ,造成单价体数量增加 ,但其影响程度还与小麦遗传背景的互作有关。观察到多种减数分裂异常现象 ,但染色体断裂的频率较低 ,表明使用端体附加系选育易位系应增大杂交后代的群体。AD134细胞学稳定性较差。在杂合状态下 ,6VS通过雌、雄配子的传递率均显著下降 ,但其通过雌配子的传递率 (平均 2 3 8% )仍显著高于通过雄配子的传递率 (平均 7 4% ) ,也高于 6V通过雌配子的传递率 ,文中对这一结果可能的原因进行了讨论

Study on the Resistance Genetics and Cytogenetic Behaviour of 6VS in Wheat-D.Villosum Telosomic Addition Line

Wheat-D.Villosum 6VS telosomic addition line“AD134” possesses powdery mildew resistance that is controlled by a gene on 6VS and expressed under different wheat background. The added 6VS univalent suppresses wheat homologous chromosome pairing, leading to the increase of wheat univalent, which is also relative to the interaction between wheat genetic backgrounds. Although various abnormal chromosomal meiotic behaviour is observed, chromosome break happens with lower frequency, showing that hybridization progenies should be enlarged for the selection and development of translocation induced by telosomic addition line. AD134 (2n=42+2t) is unstable on cytology. In heterozygous plants, the transmission frequency of gametes with 6VS decreases clearly, but is higher through female gametes than through male gametes (the mean of 23.8% and 7.4%, respectively), also than that of 6V through female gametes. Possible reasons for these results are discussed in the paper.