十字花科棒果芥属植物的花粉形态学研究

Pollen Morphology of Eight Species of Sterigmostemun(Brassicaceae)

对十字花科棒果芥属8个物种的花粉形态进行了扫描电镜观察研究.结果表明，棒果芥属8个物种的花粉形态均为长球形（P/E ＝1．33~1．84）；花粉粒具三孔沟，沟长达两极；极面观为三裂圆形，赤道面观为椭圆形；花粉具网状纹饰，稀粗网状纹饰，网眼为不规则的多边形.花粉数量特征在种间有一定差异，依据纹饰类型及萌发沟深浅均可将8种植物花粉分为2个类型.

Pollen morphology of eight species of Sterigmostemun （Brassicaceae）was observed by using scanning electron microscope for the first time.The results showed that the pollen grains of all observed species were prolate （P/E =1.33~1.84）,tricolpate （3 germinal aperture）with furrows almost extending to the both poles.They were elliptic from equatorial apparent view.Pollen grains had reticulate sculpture and rarely wide-reticulate,the mesh of reticulate sculpture showed irregular polygon.Some differences of the quantative characters of pollen grains existed among eight species.Based on the reticulate type or the depth of germinal aperture,the pollens of eight species could be divided into two groups.