东亚小金发藓和小立碗藓水分传导组织的结构与功能研究  

Comparison of structure and function of water-conducting tissues in Pogonatum inflexum and Physcomitrella patens

作　　者：姜乐源[1] 林薇[2] 孟世勇[2] 张学杰[1] 贺新强[2] 

机构地区：[1]山东师范大学生命科学学院,山东济南250014 [2]北京大学生命科学学院,北京100871

出　　处：《电子显微学报》2012年第3期251-256,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.31070156)

摘　　要：利用光学显微镜和扫描电子显微镜观察了东亚小金发藓和小立碗藓水分传导组织的结构特点,并利用染料指示测定的方法测量了这两种藓类植物传导组织的水分传导速度。实验结果表明:(1)东亚小金发藓茎中水分传导组织细胞分化明显,传水细胞具有加厚的细胞壁,且细胞壁含有多酚类化合物;倾斜的端壁表面光滑、无穿孔。(2)小立碗藓茎中央的传导组织不发达;传导组织细胞腔较小,含叶绿体,细胞壁薄,端壁上有由胞间连丝穿过形成的穿孔。(3)东亚小金发藓茎传导组织的水分传导速度明显高于小立碗藓,是小立碗藓的22倍;东亚小金发藓传导水分的方式为内导水型,而小立碗藓为外导水型。The structure and function of water-conducting tissues in Pogonatum inflexum and Physcomitrella patens were studied by light microscope and scanning electronic microscope （SEM） combined with water transportation analyses. The results show that the water- conducting tissues in P. inflexum consist of hydroids which have thick walls with polyphenolic compounds; In P. patens, the water- conducting tissue is simple, which consists of living and long-shaped parenchyma cells; Water transportation rate in P. inflexum is much higher than that in P. patens. The results indicate that P. inflexum represents the moss of endohydric water transpotation, while P. patens is ecothydric moss which water move along the surface of leafy plant.

关 键 词：东亚小金发藓 小立碗藓 传水细胞 传导组织 

分 类 号：Q945[生物学—植物学]