A Study on Cytology for lA Nulli-haploid of Winter Wheat
Dong Anshu (Department of Agronomy)
Observations on cytology for microsporocytes and microspores in lA nulli-haploid of 73(36)9-1 winter wheat of iB/lR translocation line were made. The results indicate that.(1) There is diplotene stage at meiosis, and all the chromosomes of 76.7% cells have diplonema structure with different forms, but the cells with various pairing are only 41% at MIj(2) The association of end to end has more chromosomes than those of side by side. The two associations progressively decrease with the increase of the number of bivalent in each cell;(3) In tetrad stage, there are large quantity of diads, monds, triads, as well as 5.1% of quadrants. Ther tend to develop into a great quantity of abortive microspores and some abnormal microsporesj(4) The fusion cells of various freqency occurr at MI and in micro-spores.