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在本研究室获得的一套小麦-冰草附加系材料中,附加了冰草(1.4)重组P染色体的附加系Ⅱ-21-2出现了较高频率的多价体。对小麦-冰草附加系Ⅱ-21-2的10个不同株系花粉母细胞减数分裂进行观察与统计,结果表明,不同株系均存在低频率的单价体,染色体异常联会主要表现为出现六价体和四价体,其中株系1-7-3出现六价体频率较高,出现六价体的花粉母细胞为41%,而株系1-7-7有13%的花粉母细胞出现四价体。小麦SSR标记分析表明,不同株系存在小麦基因组或P基因组的多态性。小麦-冰草附加系Ⅱ-21-2染色体异常联会可能与附加的P染色体有关,而其分子水平的多态性和重组可能对于遗传改良具有潜在的意义。
In a set of wheat-grass attachment lines obtained in our laboratory, the additional line II-21-2 with the addition of the Agropyron (1.4) recombinant P chromosome showed higher frequency of polyvalence. Pollen mother cell meiosis of 10 different lines of wheat-Agropyron addition line II-21-2 was observed and statistically analyzed. The results showed that there were low-frequency monovalent units in different lines, and the abnormal chromosome association was mainly Hexavalent body and tetravalent body appeared, of which strain 1-7-3 appeared higher frequency of hexavalent body, pollen mother cell with hexavalent body was 41%, while strain 1-7-7 had 13% pollen Mother cells appear quadrivalent. Wheat SSR marker analysis showed that there were polymorphisms of wheat genome or P genome in different lines. The association of chromosome Ⅱ-21-2 may be related to the additional P chromosome, and its polymorphism and recombination at the molecular level may have potential significance for genetic improvement.