芥蓝和结球甘蓝染色体组型及C-带带型的研究

本文用改进的染色体标本制片技术,研究了芥蓝和结球甘蓝的染色体组型和 C-带带型。两种植物的二倍体均由4对中着丝粒、5对亚中着丝粒染色体组成,其中一对为随体染色体。芥蓝和结球甘蓝具有统一的染色体组型公式:2n=18=8m+10sm(2SAT),但两者的某些染色体在编号顺序上有差异。在结球甘蓝中观察,到4种不同形态的随体。用 BSG C-带方法得到 C-带带型,带型公式,芥蓝为2n=18=CITS 型=10C+2CI_++4CT~++2CS;结球甘蓝为2n=18=CITS 型=8c+2CI_++6CT~++2CS。某些带纹具多态性和杂合性。本文从染色体水平上讨论了芥蓝与甘蓝的亲缘关系。

STUDIES ON THE KARYOTYPES AND C-BANDING PATTERNS OF CHINESE KALE(BRASSICA ALBOGLABRA)AND CABBAGE(B.OLERACEA VAR.CAPITATA)

The karyotypes of B.alboglabra and B.oleracea var.capitata were analyzed by an improv- ed technique.The diploids of the two species consist of 4 pairs of metacentric and 5 pairs of submetacentric chromosomes(1 pair of satellites).The karyotype formula is summarized as 2n =18=8m+10sin(2 SAT).But the relative positions of some similar chromosomes are different in the genomes.Four kinds of satellites were observed in B.oleracea var.capitata.C-banding patterns were obtained by BSG C-banding.The C-banding formula is:2n=18=CITS pattern =10C+2CI~++4CT~++2CS for B.alboglabra,and 2n=18=CITS pattern=8C+2CI+6CT~++ 2CS for B.oleracea var.capitata.The relationship between B.alboglabra and B.oleracea was discussed based on the chromosomal characteristics.