Abstract: Meiotic behavior and pollen viability of the haploid Chinese cabbage derived from
microspore culture were studied and the chromosome numbers of progeny plants of the haploid plants
crossing to the diploid plants were examined in the present report. The results showed the meiotic behavior
of the haploid Chinese cabbage was abnormal. At metaphaseⅠ，the univalents were either moved to the
center of the cell（equatorial plane）or scattered in the cytoplasm，occasionally 1–2 bivalents or one
trivalent occurred；At anaphase Ⅰ，the chromosomes freely went to opposite poles，resulting in 0/10，
1/9， 2/8，3/7，4/6 and 5/5 chromosome distributions，occasionally to three poles，forming 1/4/5，2/2/6
and so on chromosome distributions. The products of the meiosis included tetrads，dyads and triads. The
seed set of the haploid plants × the diploid plants by artificial pollination was very low，only about 0.068
seeds per pod. By chromosome number identification，of the total 11 progeny plants，ten plants were
diploid （2n = 20）and one monsomic plant（2n–1 = 19）.

Key words: Chinese cabbage, haploid, meiosis, monosomic plant