滇南风吹楠花粉形态观察  

Pollen morphology of Horsfieldia tetratepala

作　　者：张平[1] 徐凤霞[1] 

机构地区：[1]中国科学院华南植物园,中国科学院植物资源保护与可持续利用重点实验室,广州510650

出　　处：《广西植物》2011年第3期328-331,287,共5页Guihaia

基　　金：国家自然科学基金(30770140);中国科学院生命科学领域基础前沿研究专项(KSCX2-EW-J-28)~~

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0.29μm;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。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.

关 键 词：滇南风吹楠 肉豆蔻科 花粉形态 

分 类 号：Q944.58[生物学—植物学]