长序狼尾草的核型分析

本文对长序狼尾草的染色体组型作了观察分析,确定其染色体数目为2n=6x=54。按Lima-De-Faria的分级标准,其染色体可分为中等大小染色体和小染色体(N0.1—5)和小染色体(N0.6—27);按郭幸荣等提出的分类方法来进行分析,其染色体亦可分为中短染色体M_1(N0.1—21)和短染色体S(N0.22—27)。因此,长序狼尾草的染色体属于小型染色体类。另外,在N0.1和N0.6染色体一臂上分别存在有一对随体

Karyotypic analysis of chromosomes in Pennisetun Iongissimum

The karyotype from P.Iongissimum has been investigated and analysed. The rusults are as follows: The number of chromosomes of the plant is 2n=6x=54. On the one hand, there are 5 pairs of medium chromosomes from No.1 to No.5 and 22 Pairs of small chromosomes from No.6 to No.27 by Lima-De-Farias chromosome field theory and on the other hand, there are 21 pairs of medium-short chromosomes M,from No.1 to No.21 and 6 pairs of short chromosomes from No.22 to No.27 by Guo Xingrong's classification of chromosomes. Furthermore, these chromosomes in P. longissimum are all small types. There are 2 pairs of satellites on the No.1 and No.6 chromosomes of the plant.