芥菜花粉形态特征及分类初探

对芥菜(Brassica juncea Czern.et Coss.)17个变种的代表品种的花粉材料进行了扫描电镜观察.结果表明,芥菜花粉形状呈近球形、长球形或超长球形,随品种而异;花粉大小虽在变种间具有明显差异,但不能作为准确的变种分类依据;变种间在花粉的萌发器官和外壁纹饰方面有一定的差异,根据其特征可以对芥菜进行分类.其结果支持传统的芥菜种以下水平的分类.

Preliminary studies on mustard taxonomy based on pollen morphology

Pollen grains of 17 mustard subspecies were examined under scanning electron microscope. The result showed that the pollen shapes were nearly spherical, or spheroidal, or super-spheroidal from the equatorial view, depending on cultivars of mustard. The size of pollen grain showed great variation among subspecies, but it was rather difficult to classify the subspecies according to the pollen grain size. However, by comparison of the sculpture of pollen extine and germinal pore, as well as pollen shapes and pollen size, mustard subspecies used in this experiment could be classified. This classification was comparable to the traditional subspecies classification.