山茶属连蕊茶组6种植物花粉形态特征研究

Pollen Features of 6 Species in Sect. Theopsis of Genus Camellia

摘要:

首次用扫描电子显微镜观察了山茶属(Camellia)连蕊茶组(Sect. TheopsisCoh. St.) 6种植物花粉的形态特征。结果表明,这6种植物的花粉外壁纹饰可分为4大类型: 皱波状(肖长尖连蕊茶CamelliasubacutissimaChang和岳麓连蕊茶C.handeliiSealy)； 不规则皱网状(毛柄连蕊茶C.fraternalHance和七瓣连蕊茶C.septempetalaChang et L. L. Qi)； 脑纹状(柃叶连蕊茶C.euryoidesLindl.)； 穴状(小长尾连蕊茶C.parvicaudataChang)。不同种植物花粉外壁纹饰存在一定差异,可为组内种间的区分提供参考依据,具有分类学意义。

Abstract:

Pollen morphology of 6 species in the Sect. Theopsis of Camellia were observed under SEM. Pollen grains of the species studied are prolate in shape, elongated-elliptical in equatorial view and trilete rounded (trilete obtuse-triangular for C. euryoides and C. parvicaudata) in polar view, ca. 92.3-106.8 μm × 45.2-58.6 μm in size with apecture 3-colpate, furrow membrane absent or not obvious. Four types of sculptures can be recognized: (1) exine rugulate (Camellia subacutissima Chang and C. handelii Sealy), (2) exine irregularly reticulate(C. fraternal Hance and C. septempetala Chang et L．L．Qi)，(3) exine cerebroid(C. euryoides Lindl.)and (4) exine foveolate(C. parvicaudata Chang)．The features in species studied will serve as good taxonomic characters.