木瓜属及其近缘属的花粉形态及系统学意义(英文)

Pollen morphology and phylogenetic significance of Pseudocydonia and related genera

对木瓜属(Pseudocydonia)、贴梗海棠属(Chaenomeles)和榅桲属(Cydonia)植物的花粉亚显微形态进行了研究。结果表明,其花粉均属于N3P4C3型,为辐射对称的长球形,极少为超长球形。贴梗海棠属花粉大小(极轴长(P)×赤道轴长(E))为33.24~48.27μm×18.93~25.58μm;木瓜属为37.15~42.50μm×19.63~22.83μm;榅桲属为36.85~43.95μm×19.63~22.83μm。贴梗海棠属的和木瓜属花粉的表面纹饰为条纹状,前者的条纹极不规则而后者条纹近于平行,榅桲属花粉外壁近光滑。花粉亚显微形态对于3个近缘属的分类具有较大意义,支持将木瓜单独成属。另外,对所有种类的花粉形态进行了描述,并编制了分类检索表。

The pollen morphology of Pseudocydonia,Chaenomeles and Cydonia were studied with the aid of scanning electron microscope(SEM). Pollen grains were N3P4C3 type according to G. Erdtman's N. P. C system,radio symmetric prolate or rarely perprolate,with the sizes of 33. 24- 48. 27 μm(P) × 18. 93- 25. 58 μm(E) in Chaenomeles,37. 15- 42. 50 μm(P) × 21. 74- 24. 86 μm(E) in Pseudocydonia,and 36. 85- 43. 95 μm(P) × 19. 63- 22. 83 μm(E)in Cydonia. The exine sculpture was striate in Chaenomeles and Pseudocydonia(stripes irregular in the former but nearly parallel in the latter),while nearly smooth in Cydonia. The results demonstrated that palynological characters were valuable in recognition of taxa in specific and genera level and agreed with the separation of Chaenomeles and Pseduocydonia.The pollen submicroscopic characters of six species in three genera were described,and a key was compiled for them.