40个野生滇牡丹群体的花粉形态研究

Pollen morphology of 40 wild Paeonia delavayi (Paeoniaceae) populations

通过扫描电镜观察了野生滇牡丹40个群体的花粉形态,结果表明其花粉有较明显的多样性。不同群体的花粉赤道面观多为长球形,少数为超长球形或近球形,极面观为三裂圆形,萌发器官具三拟孔沟,外壁纹饰形态多样,可分为小穴状、穴状、网状、粗网状、皱波-网状、皱波状等。按照数量分类学性状对40个群体进行了亲缘关系的聚类分析,结合表型性状特征分析认为花粉形态与植株不同群体及花色等密切相关。最后讨论了花粉形态在牡丹分类和系统演化方面的参考价值。

Pollen morphology of 40 wild populations of Paeonia delavayi was examined using scanning electron microscope. The results indicated that pollen morphology of P. delavayi had distinguished diversity among different groups. The pollen grains were prolate, occasionally perprolate or subspheroidal, 3- colporoidate,and the polars were 3-split rotundity. Exine sculptural types include 6 types, i. e. micro- foveolate, foveolate, reticulate, wide-reticulate, regulate-reticulate and regulate patterns. Combined analyses together with macromorphology, the pollen grain morphology has a high correlation with flower color and living conditions. Finally, the significance of systematics and evolution about tree peony was discussed through pollen morphological characters.