大叶藓7个自然居群的形态解剖学研究  

Morphological anatomical studies on seven natural populations of Rhodobryum roseum (Weis.) Limpr.

作　　者：唐锐[1] 王丽[1] 李高阳[2] 曹袁祺[1] 

机构地区：[1]四川大学生命科学学院,成都610064 [2]河南省林业科学研究院,郑州450008

出　　处：《四川大学学报（自然科学版）》2009年第3期824-828,共5页Journal of Sichuan University(Natural Science Edition)

摘　　要：采用石蜡切片和计算机扫描、数字化处理等手段,对7个不同居群的大叶藓Rhodo-bryum roseum(Weis.)Limpr。叶片的几个形态解剖特征进行测量和统计分析。结果表明:大叶藓叶片由1层细胞构成,中肋由上皮细胞,下皮细胞和厚壁细胞构成,无主细胞和副细胞之分,随着海拔的升高,大叶藓叶片的厚度(r=0.447)和中肋厚度(r=0.504)增加,叶片面积(r=—0.702)和叶片细胞密度(r=—0.807*)减少,灌木林下生长的居群与乔木林下的居群表现出很大差异。初步分析认为,大叶藓叶片的形态结构变化与环境关系密切,尤其是微环境的影响更为严重;叶片厚度和中肋厚度增加,叶片面积和细胞密度的减少可能是大叶藓抗旱性增强的表现。Paraffin section, the anatomical structures computer scanning and digital processing were used to observe and analyse of leaves from seven different populations of Rhodobryum roseum （Weis.） Limpr in Sichuan province. The results showed that, the leaf of R. roseum （Weis.） Limpr. , was composed of only one layer of cells, the costae were composed of epithelial cell, hypoblast and stereid, with no differentiation of main-cell and paracell. With the increase of altitude, the thickness of leaves （r=0. 447） and costae （r=0. 504） increased, the area （r=-0. 702） and cell density （r=-0. 807＊ ） of leaves decreased, remarkable disparity lied between the population growing under shrubberies and the ones under arbors. It was suggested that, the morphological structure changes were closely related to environment, especially the micro-environment. Maybe what represented the improvement of anti-arid ability is that the increase of thickness of leaves and costae, and that the decrease of area and cell density of leaves.

关 键 词：海拔梯度 大叶藓 解剖结构 

分 类 号：Q944[生物学—植物学]