| 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。 |
| 关键词: 盖裂木属 Talauma gloriensis T.mexicana 花粉形态 |
| DOI： |
| 分类号:Q944.58 |
| 基金项目: |
|
| Observation of pollen morphology of two species from Talauma |
|
CHEN Dong-Qin1,2,3, XU Feng-Xia1,2*
|
|
1.South China Botanical Garden,The Chinese Academy of Sciences,Guangzhou 510650,China;2.Key Lab of Digital Botanical Garden
of Guangdong Province,Guangzhou 510650,China;3.Graduate School of the Chinese Academy of Sciences,Beijing 100049,China
|
| Abstract: |
| 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(tectum 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 tectum and foot layer could be found in T.mexicana. |
| Key words: Talauma T.gloriensis T.mexicana pollen morphology |
