| 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
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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 |
