15种榛子种质的染色体核型分析

 采用普通压片法，以榛子叶芽为试材对其15个种质资源的核型进行了研究，结果表明榛子各种质染色体均为二倍体；核型可分为三种类型：2n=2x=22=22m、2n=2x=22=20m+2sm和2n=2x=22=16m+6sm；没有发现随体；所有种质染色体绝对长度平均值为1.50 μm，属小染色体；除欧榛和7#为1A型， B-23为2B型外，其余种质皆为1B型。种质间核型具有很大的相似性。

Analysis of Karyotype on Fifteen Hazelnut Germplasms

The karyotype of fifteen hazelnut germplasms was studied by method of squash with the young leaves as test materials. The results showed that all the chromosomes were diploid; The karyotypes were divided into three types, i. e. 2 n = 2x = 22 = 22m type, 2n = 2x = 22 = 20m +2 sm type and 2n = 2x = 22 = 16m +6sm type. There was no satellites found in the morphological observation of chromosomes; The average of chromosome absolute length on fifteen hazelnut germplasms was 1.50 μm, so it was small in size; the karyotype of the fifteen hazelnut germplasms all belonged to 1B type except that of C. avellana L. and 7# which were 1A type and B-23 which was 2B type, respectively. There was great similarity of karyotype among the germplasms.