山茶属8种1变种花粉形态比较

Observations on Pollen Morphology of 8 Species and 1 Variety in Genus Camellia

在光学显微镜和扫描电子显微镜下，对山茶属Ｃａｍｅｌｉａ８个种１变种植物花粉形态进行了比较观察。结果表明，山茶属植物花粉粒为中粒或大粒，多为长球形，极面观多为三裂圆形；具３孔沟，沟较细长，内孔有多种形状；表面多具网状或拟网状纹饰，网眼和网脊的大小、形状在种间存在一定的差异。本属植物花粉形态较为一致，表明是一个自然类群。茶组植物花粉形态是从表面较光滑的小穴网状类型向较为突起的网状演化的。

Pollen morphology of 8 species and 1 variety in genus Camellia was observed using light microscope and scanning electron microscope. Results showed that the pollen grain sizes in genus Camellia were middle or big, mostly showing prolate from the equatorial view and trioblate circular from the polar view. The aperture was 3 colporate, with fine and long colpi and multishaped os. Reticulate and obscurely reticulate ornamentations were found on the surface of the pollen. The muri and lumina varied in size and shape from the species. The pollen morphology of the genus was relatively identical, indicating that the genus Camellia was a natural group. The pollens in the sect. Thea evolved from the smooth reticulate ornamentation to the coarse reticulate ornamentation.