摘要
对中国云南邦崴大茶树、云南大叶种和印度阿萨姆种、缅甸掸部大叶种、越南大叶种等５个大叶茶树的染色体组型进行了分析。结果表明，这５个茶树品种均为二倍体（２ｎ＝２ｘ＝３０），但存在染色体数目的变异，特别是在越南大叶品种中首次发现了一个体细胞染色体数为３１条的细胞。这５个品种均为２Ａ型核型，其核型对称性的大小顺序为：邦崴大叶茶树→阿萨姆种→云南大叶种、越南大叶种→掸部大叶种。根据核型分析结果。
By usign wall degradation hydration flame drying method of preparing chromosomesamples in plants,18 karyotypes of sexual tea varieties and sexual offsprings from asexual line were observed.All of the varieties were diploid,2n=2x=30,but inHainandaye variety a few autoploid cells were found and in Jianghuatianchavariety a tetraploid was found.In all the varieties aneuploid cells with less than 30chromosomes were observed,but no B-chromosome was found.There were differenceof the karyotypes between the varieties or even between the cells.The main karyotypeswere 2n=2x=30=18m+6sm=2sm^(sat)+4st^(sat)and 2n=2x=30=18m+6sm+4sm^(sat)+2st^(sat).In the 15 pairs of tea chromosomes,only 3 to 4 pairs of sm or st chromosomescarried the satellites.A karyotype comparison between tea karyotypes and other plantsof genus Camellia showed that the later were more symmetrical.No absolute differenttypes of karyotype among all the tea varieties were found,so in taxonomy they shouldbelong to genus Camellia,Camellia sinensis(L.)O.Ktze.
出处
《茶叶科学》
CAS
CSCD
1996年第2期119-124,共6页
Journal of Tea Science
