不同居群白木香的染色体研究(英文)

Chromosomal studies on populations of Aquilaria sinensis

采用常规压片法和改良BSG法对3个居群白木香的染色体核型及Giemsa C-带带型进行研究。结果表明:3个居群白木香的核型均属2B类型,其中广西居群白木香的核型公式为2n=16=4m+8sm+4st;其他两个居群白木香的核型公式为2n=16=6m+6sm+4st,居群间核型变异不明显。白木香的C带带型为CIT型,具有着丝粒带、中间带、端带和全带。3个居群白木香C带的分布、数目和类型不完全一样,出现了带型的多态性。

For the first time,a conventional analysis of chromosome karyotype and Giemsa C-banding was carried out in three populations of Aquilaria sinensis. Three populations showed same chromosome number of 2n= 2x= 16 and the asymmetry of the karyotype was categorized as type 2B. The variance of karyotype was not obvious in three populations,only karyotypical formula （2n= 16=4m＋8sm＋4st） in one population was different from the other two （2n = 16=6m＋6sm＋4st）. The Giemsa C-banding pattern of A. sinensis was CIT pattern. Within Giemsa C-banding pattern of A. sinensis there were centromerie bands,intercalary bands, telomeric bands and whole bands. The distributed position,numbers and types of the C-banding on the chromosome of A. sinensis had shown the clear polymorphisms.