不同居群狗牙根的叶片解剖结构比较研究

对20个不同生长环境的狗牙根叶片进行了比较解剖学的研究。结果表明,参试材料在角质层厚度、表皮细胞厚度、叶表皮细胞的长宽、气孔的大小及密度、叶片厚度、维管束个数及直径大小,机械组织厚度等方面有显著的差异。其中变异系数较大的是气孔密度及中脉维管束与上表皮间的机械组织厚度,气孔密度的变幅为77.49～335.46个/mm²,变异系数达36.93%,机械组织厚度的变幅为7.50～45.00μm,变异系数达64.20%。将测定的数量指标进行了聚类分析,20个不同居群的狗牙根可分为4大类。聚类结果与狗牙根的生境分布相互吻合。

A comparative study on the anatomical structure of leaves from different populations of bermudagrass

A study of the anatomical structure of leaves from 20 populations of bermudagras growing in different environments found that there were significant differences in cuticular thickness, epidermal cells thickness, leaf epidermal cell lengths and widths, stomata size and density, leaf thickness, number and diameter of vascular bundles, and strengthening tissue thickness. The coefficients of variability were greater in stomatal density and in strengthening tissue thickness than in vascular bundles of midribs and the abaxial epidermis. Stomatal density ranged from 77.49 to 335.46 per mm², with a coefficient of variability up to 36.93%. Strengthening tissue thickness ranged from 7.50 to 45.00 μm, with a coefficient of variability up to 64.20%. Using the indexes measured, the 20 populations of bermudagrass could be divided into four categories by cluster analysis. The results of cluster analysis were identical with the population distributions of the bermudagrass.