5种干旱区野生观赏植物染色体数目及其核型分析

Chromosome Numbers and Karyotype Analysls of Five Wild Ornamental Plants in Drid Areas

本文采取常规根尖压片法对 5种干旱区野生观赏植物进行了染色体数目统计 ,并对其中的 3种进行了核型分析。结果表明 :5种植物染色体均属于二倍体 ,其中白花枝子花(DracocephalumhererophyllumBenth .)、角蒿 (IncarvilleasinensisLam .)、金露梅 (PotentillafruticosaL .)有四倍体现象 ;3种植物染色体核型公式分别为白花枝子花 2n =1 2 =1 0m + 2st,角蒿 2n =2 2 =1 8m + 4sm ,北点地梅 (AndrosaceseptentrionalisL .) 2n =1 8=1 6m + 2sm ,均属于原始类型。本次试验旨在为研究物种多样性、建立干旱区野生观赏植物基因库、保护和繁育野生观赏植物等提供科学依据。

The chromosome numbers of 5 species were counted by root tip squash method,and karyotypes of 3 species of them were analyzed. The results showed that the 5 species are diploid. The karyotype formulas of 3 species are as follows respectively: Dracocephalum hererophyllum Bent.:2n=12=10m+2sm; Incarvillea sinensis Lam.2n=22=18m+4sm; Androsace septentrionalis L.:2n=18=16m+2sm; It is found that they are of raw type. The experiment provides scientific reference for the research of relationship between the species\, the foundation of gene bank and the protection of wild ornamental plants in arid aria.