14个海州常山种源的染色体核型

Chromosome karyotype of Clerodendrum trochotomum from 14 provenances

采用常规压片法,以发芽期嫩芽为试材,观察了14个海州常山Clerodendrum trochotomum种源的核型特征。结果表明:海州常山染色体均为二倍体,染色体核型可以分为5种类型:2n=2x=36 m+16 sm,2n=2x=40 m+12 sm,2n=2x=44 m+8 sm,2n=2x=46 m+6 sm,2n=2x=48 m+4 sm,没有发现随体。各种源染色体绝对长度为1.18～1.59μm,平均值为1.45μm,属小染色体。14个种源中,除021号属于2A型外,其余种源都属于2B型,种源间核型具有很大的相似性。

Taking treated tender buds in germination stage as experimental materials,the karyotypes of Clerodendrum trochotomum Thumb.from 14 provenances were observed by the conventional sheeting method.The results indicated that all the chromosomes of the 14 provenances were diploids and attributed to small chromosomes,with an absolute average length of 1.45 μm.There were 5 types of chromosome karyotypes classified from the morphological observation：2n = 2x = 36 m ＋ 16 sm,2n = 2x = 40 m ＋ 12 sm,2n = 2x = 44 m ＋ 8 sm,2n = 2x = 46 m ＋ 6 sm and 2n = 2x = 48 m ＋ 4 sm,respectively,and there was no satellite found in all the karyotypes.The karyotypes of all the provenances showed a morphological similarity,with karyotype type of 2B,except the 021 provenances of 2A type.[Ch,2 fig.3 tab.22 ref.]