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作 者 ：廖道龙1,2，谢 利1，曾瑞珍1，黎扬辉3，易懋升3，张志胜1*

期 刊 ：西北植物学报 2012年 10期 页码：2023~2029

关键词：石斛属；染色体倍性；形态学性状；气孔性状；

Keywords:Dendrobium, chromosome ploidy, morphological character, the stomatal character,

摘 要 ：采用根尖压片法对55份石斛属资源的倍性进行了鉴定，并测量它们的气孔长度、气孔密度、叶长、叶宽、叶厚、株高、茎粗、花朵直径和花瓣厚度9个形态学性状。结果显示：（1）55份供试石斛属资源材料中有：四倍体40份、占72.73%，三倍体11份、占20.00%，二倍体4份、占7.27%。（2）对石斛属倍性与9个形态学性状进行相关分析表明，气孔长度、叶长、叶宽、叶厚、茎粗、花朵直径和花瓣厚度7个性状与染色体倍性呈极显著正相关，气孔密度与染色体倍性呈极显著负相关，株高与染色体倍性相关性不显著。

Abstract:Ploidy level of 55 Dendrobium was identified by using squash method,and the length and density of stoma,the length,width and thickness of leaf,the height of plant,the diameters of the stem and the flower and the thickness of petal were also measured.The results showed that:(1)55 Dendrobium resource were composed of 40 tetraploids,11 triploids and 4 diploids,with tetraploid resources,triploid resources and diploid resources accounting for 72.73%,20.00% and 7.27%,respectively.(2)According to the correlation analysis of the chromosome ploidy and 9 morphological traits in Dendrobium,the chromosome ploidy is significantly negatively associated to the dense of stoma and is significantly associated to the length of stoma,the width and thickness of leaf,the diameters of the stem,the diameter of the flower and the thickness of petal.There was not significant coorelation between the chromosome ploidy and the height of plant in the Dendrobium.

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