糖甜菜异附加三体的获得及减数分裂行为观察

通过甜菜属近缘种3种间杂交(B.patula×B.cicla F_1,对B.vulgaris杂交),从后代中分离出了3个具有B.patula染色体的异附加三体植株。其中PT5-1植株具有B.patula的红色叶脉性状,且附加染色体明显小于糖甜菜染色体,认定为B.patula的9号染色体,另两株附加的B.patula染色体号未确定。减数分裂终变期1Ⅲ 8Ⅱ频率平均为5.65％,9Ⅱ 1Ⅰ频率为92.50％,都与糖甜菜初级三体有显著差异。中期Ⅰ,1Ⅲ 8Ⅱ频率有所降低。正常四分体频率为93.28％。实际传递率较低。文章还讨论了异附加三体的利用价值。

The Acquirement of Heteroadditional Trisomics and Observation of Their Meiotic Behaviour in Sugarbeet

Three monosomic additions with B. patula chromosome were segregated from the progenies obtained by interspecific crossing of three relative species. (B. patula x B. cicla) F1 x B. vulgaris. Plant PT 5-1 displayed the red vein characters of B. patula and its alien chromosome was less than that of sugar-beet evidently. Cytologicai studies shown its alien chromosome to be No. 9 of chromosome of patula, but chromosome No. of another two plants have not defined. Frequency of meiotic diakinesis, 1 III 8 II were 5.65% by mean, 9 II 1 II were 92.50%, they all have significantly different from sugarbeet primary trisomic. Frequency of 1 III 8 II have decreased at metaphase I. The frequency of ncrma1 tetrad were 93.28%, Actually the transmission rate were rather low. The utilization value of heteroadditional trisomics were discussed.