CAJ | 학술논문

首次报道了乐昌含笑(Michelia chapensis)的染色体数目和核型.核型公式为2 n=38=28 m+6 sm+4 st (2SAT).与前人认为整个含笑属都为单一的2A型不同,乐昌含笑的核型属于Stebbins的2B型,具有2对近端着丝粒染色体.而且发现在第9对染色体上有小随体的存在.这些表明在含笑属内含有不同的核型.乐昌含笑在细胞学意义上可能是属内比较进化的类群.对染色体结构的细微改变在木兰科植物的种属进化上的作用进行了简要讨论.
수차보도료악창함소(Michelia chapensis)적염색체수목화핵형.핵형공식위2 n=38=28 m+6 sm+4 st (2SAT).여전인인위정개함소속도위단일적2A형불동,악창함소적핵형속우Stebbins적2B형,구유2대근단착사립염색체.이차발현재제9대염색체상유소수체적존재.저사표명재함소속내함유불동적핵형.악창함소재세포학의의상가능시속내비교진화적류군.대염색체결구적세미개변재목란과식물적충속진화상적작용진행료간요토론.
Michelia chapensis Dandy is firstly karyomorphologically studied. Its karyotype can be formulated as 2n=38=28 m+6 sm+4 st (2SAT), belonging to Stebbins's 2B type. This is a new karyotype report, which, different from the previous confirmation that in Michelia group, the whole karyotypes of genus are of uniform 2A and there is no st chromosome occurred. There might be different karyotypes within Michelia, and M. chapensis is probably a relatively advanced species. We briefly discuss the role of minor chromosomal structural alterations played in evolution of genus or species in Magnoliaceae.