| 摘要: |
| 采用光镜、扫描电镜和透射电镜对滇南风吹楠的花粉形态进行观察。滇南风吹楠的花粉粒呈单粒存在,远极面观为椭圆形,近极面观大体为三角形,为不等极,两侧对称。花粉粒具一条远极单萌发沟; 花粉大小为(15)19.90(21)μm×(20)22.50(25)μm。花粉粒外壁纹饰为网状,网脊平均宽度为0.29 μm; 网眼形状不规则,大小差异较大。在透射电镜下,花粉外壁可分为覆盖层、柱状层和基层,基层占外壁厚度的1/2。外壁-2明显,且厚度不均匀。内壁可分为3层。在远极面萌发沟区域,外壁逐渐减薄,最后消失,仅残留内壁。风吹楠属的花粉形态特征是一致的,而与亚洲分布的其它属的花粉形态有差别,与其它属的分类界限是明确的。 |
| 关键词: 滇南风吹楠 肉豆蔻科 花粉形态 |
| DOI：10.3969/j.issn.1000-3142.2011.05.010 |
| 分类号:Q944.58 |
| 基金项目: |
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| Pollen morphology of Horsfieldia tetratepala |
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ZHANG Ping, XU Feng-Xia*
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Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China
Botanical Garden, the Chinese Academy of Sciences, Guangzhou 510650, China
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China
Botanical Garden, the Chinese Academy of Sciences, Guangzhou 510650, China
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| Abstract: |
| Pollen grains of Horsfieldia tetratepala were examined by using light microscope(LM),scanning electron microscope(SEM)and transmission electron microscope(TEM). Pollen grains of H.tetratepala are boat-shaped,with a sulcate aperture on the distal face. The tectum is reticulate. The sizes of pollens are ranging from 1(15)9.90(21)μm×(20)22.50(25)μm. The exine of H.tetratepala could be distinguished into tectum,columella and foot layer. Foot layer is nearly one-half of the total exine thickness. Endexine is distinct and varies in thickness. Intine can be distinguished into 3 layers. The exine elements(tectum,columella and foot layer)are reduced gradually to a thin foot layer in the colpus area. The pollen characters are basically consistent in Horsfieldia,while some differences exist among different Asian genera,which indicates the definite classification of Horsfieldia. |
| Key words: Horsfieldia tetratepala Myristicaceae pollen morphology |
