盖裂木属两种植物花粉形态观察  

Observation of pollen morphology of two species from Talauma

作　　者：陈东钦[1] 徐凤霞[1] 

机构地区：[1]中国科学院华南植物园

出　　处：《广西植物》2008年第3期317-319,289,共4页Guihaia

基　　金：国家自然科学基金(30770140,30370108);广东省自然科学基金(5006764);教育部留学回国人员科研启动基金~~

摘　　要：利用光学显微镜、扫描电镜和透射电镜观察了盖裂木属两种Talauma gloriensis和T.mexicana的花粉形态。花粉粒具远极单萌发沟,椭圆球形,外壁较光滑或略粗糙且具小穴状雕纹。在透射电镜下,花粉外壁可分为覆盖层、柱状层和基层,外壁-2明显,且厚度不均匀。在远极面萌发沟区域,外壁逐渐减薄,最后覆盖层和柱状层消失,仅残留基层。T.gloriensis的柱状层内部空间较小,多由颗粒组成,而T.mexicana柱状层中有发育较好的小柱,与覆盖层和基层连接。The pollen grains of Talauma gloriensis and T. mexicana are large with the longest axis more than 45 μm,elliptica in polar view,boat-shaped in equatorial view. Exine sculpture is foveolate or slightly coarse. The exine of these two species can be distinguished by tectum,columella and foot layer. The colpus membrane consists of a thin foot-layer and intine,while the sexine elements（rectum and columella）are reduced gradually. Endexine is distinct and varies in thickness. Granules are frequently observed in columella with small intraexinous spaces in T. gloriensis,while individual well-developed columella,connecting directly the rectum and foot layer could be found in T. mexicana.

关 键 词：盖裂木属 Talauma gloriensis T.mexicana 花粉形态 

分 类 号：Q944.58[生物学—植物学]