中国菟丝子属植物花粉的扫描电镜观察

SCANNING ELECTRO MICROSCOPE OBSERVATION ON POLLEN MORPHOLOGY OF CUSCUTA L.IN CHINA

本文作者用扫描电镜(SEM)对国产菟丝子属(Cuscuta L.)10种植物的花粉形态进行了观察。具3沟萌发孔的花粉为本属基本类型。根据萌发孔的数目,外壁纹饰等特征,该属花粉可划分为三个类型:(1)具3沟,外壁具穿孔,表面散生小刺状突起;(2)具3—5沟,外壁具网状纹饰,网脊上散生小刺状突起;(3)具3—6沟,外壁具小刺状突起,穿孔偶见。本文观察结果与刘炳仑等曾报道过光学显微镜(LM)下的结果不完全一致。最后,对菟丝子属的花粉形态的演化趋势以及属内亚属间关系进行了讨论。

The pollen morphology (Table 1) of 10 species of the Cuseuta L. from China was examied under light microscope and scanning electron microscope. The tricolpate of the genus are the basic type. According to the position and number of the aperture and ornamentation of exine, the pollen grains are divided into three type: ( 1) tricolpate-perforation type; ( 2) 3-5colpate-reticulate type; (3 ) tricolpate (thin 6-) -echinate type. Evolutional trend of pollea ef the Cuscuta, and relationships of three subgenera were discussed on the basis of palynological data.