论文部分内容阅读
根据多年来对(普通小麦×长穗偃麦草)杂种 F_1—F_4及与小麦回交后的杂种 B_1F_1选株的细胞学观察和分析,讨论了八倍体小偃麦的形成途径。认为小麦和偃麦草杂交后,需要与小麦回交1—2次,在于使染色体组重新组合,形成 AABBDDEE 和 AABBDDFF 两种染色体组型的八倍体。类型基本稳定的八倍体小偃麦,在较长世代内减数分裂仍不正常,中期Ⅰ单价体的频率较高。同时讨论了结实率与减数分裂稳定性的关系。最后分析了几个八倍体小偃麦的染色体组型,及其在育种上利用的前景。
According to the cytological observation and analysis of F_1-F_4 hybrids and the hybrid B_1F_1 after backcrossing with wheat over many years, the formation pathway of octoploidy is discussed. It is thought that wheat and wheat should be backcrossed 1-2 times after crossing with the wheat and the wheat, and the chromosome group is recombined to form the octoploids of two chromosome types AABBDDEE and AABBDDFF. The haplotype Triticum, which is basically stable in type, still does not undergo meiosis in longer generations, and the frequency of monovalent I metaphase is higher. The relationship between seed setting rate and meiosis stability was also discussed. Finally, we analyzed the chromosome constitutions of several octoploid plants and their prospects in breeding.