利用扫描电镜对犁头尖属(Typhonium Schott)及其近缘属共18种植物的花粉进行研究,其中,8种为首次报道,11种为我国特有.结果表明:天南星族4属植物的花粉形态基本一致,即球形,无萌发孔,无覆盖层,具刺.但各个种在花粉粒大小、刺长、刺的形状、刺的密度、刺基部直径和刺间纹饰方面差别较大,可以作为种的区别特征之一.花粉形态特征支持天南星族为本科最进化类群的观点.花粉粒刺间具颗粒为半夏属(Pinellia Tenore)植物花粉的显著特征.花粉形态特征不支持将单籽犁头尖(T. calcicolum C.Y.Wu ex H.Li et al.)和昆明犁头尖(T.kunmin-gense H.Li)合并.西南犁头尖(T.omeiense H.Li)的花粉粒非常小,认为是较进化的种.犁头尖属内种间的花粉形态差异较大,甚至大于属间的差异,或许该属的系统分类需要作较大的变动,这与Susanne利用cpDNA片段的所得结果基本一致.
Pollen Morphologies of Typhonium Schott and Its Genetically Close Genera (Araceae)
The pollens of 18 plants of Typhonium Schott and its genetically close genera,8 first reported plants and eleven endemic plants in China were studied with a scanning electron microscope. The results show that the plants of four genera of Tribe Areae have basically similar pollens,which are spherical,inaperturate,intectate and spinulose,but they greatly differed in pollen size,spinule length,shape and density,basal spinule diameter,and inter-spinule ornamentation,and this can be used as one of the species-identifying characteristics. The pollen morphologies support the viewpoint that Tribe Areae is the most evolutive taxon of Araceae. Granular exine sculpture is the most remarkable pollen features of Pinellia Tenore plants. The pollen morphologies do not support the viewpoint that T. calcicolum C. Y. Wu ex H. Li et al.and T. kunmingense H. Li should be merged. T. omeiense H. Li has very small pollens and as results is thought a more evolutive species. The species of T. omeiense H. Li differ in pollen morphology,even more than the genera do ,and hence the classification of this genus may need to be modified to a large extent,which agrees with the results achieved by Susanne with cpDNA bands.
pollen morphologyTyphonium Schotttaxonomic classificationscanning electron microscope
NETL
NSTL
万方数据
维普
