摘要
本文报道了国产蔷薇科绣线菊亚科(Spiraeoideae)8属9种植物花粉形态。该亚科花粉近球形,极面观三裂圆形。花粉通常较小,最小花粉见于Spiraeapurpurea,为1487(1275～1658)μm×1517(1275～1734)μm,其中Physocarpusamurensis的花粉比较大,为2797(1989～3825)μm×3091(2677～3366)μm。三孔沟,内孔为长方形,部分种内孔明显外突。沟较长,两端较窄,在Physocarpusamurensis观察到合沟现象。合沟出现时通常三沟在一极汇合,在另一极常不汇合。花粉外壁具穴状、条纹-穴状、条纹-网状、条纹状等数种纹饰。迄今为止,在Rosaceae观察到的所有花粉外壁纹饰中,除较为特化的刺状纹外,其余纹饰在该亚科均存在。在Rosaceae所有的花粉外壁纹饰中,穴状纹饰可能是较为原始的类型,条纹状-网状和条纹状依次是较为进化的,而刺状是最进化的纹饰。在Spiraea中,外壁纹饰有相对进化的条纹-网状和条纹状,然而未观察到穴状这一最原始类型,这表明该属及其属下种的分化程度可能较高。但因Spiraea所含种数较大,这一推论有待进一步深入论证。此外,花粉形态特征支持Takhtajan(1997)关于Spiraeoideae亚科下族与属的排序。
The pollen morphology of Spiraeoideae (Rosaceae) including the genera Spiraea, Sibiraea, Aruncus, Sorbaria, Physocarpus, Neillia and Stephanandra in China was reported in this paper. All the pollen grains are tricolporate, the shapes are subspheroidal to spheroidal.The pollen grains are small, the smallest one was observed in Spiraea purpurea with the size of 14.87(12.75～16.58)μm×15.17(12.75～17.4)μm, while the biggest one was observed in Physocarpus amurensis with the size of 27.97(19.89～38.25)μm×30.91(26.77～33.66)μm. Amb is 3-lobed circular in common but syncolpolate was observed in Physocarpus amurensis. The colpi are usually long but narrowed in two ends. The ora form rectangle. Sculptural types of the subfamily Spiraeoideae include foveolate, striate-foveolate, striate reticulate, and striate. All the sculptural types in Rosaceae were observed except spinulate type. The foveolate type may be the most primitive pollen sculpture in Rosaceae, while the types of striate and striate reticulate are more advanced. The pollen sculpture is either striate reticulate or striate in the genus Spiraea without foveolate, which shows that the degree of differentiation is rather high in Spiraea. The pollen morphology supports the arrangement of tribes and genera in subfamily Spiraeoideae given by A. Takhtajan in 1997.
出处
《云南植物研究》
CSCD
1999年第3期303-308,共6页
Acta Botanica Yunnanica
基金
中国科学院资环局资助!KZ95 1-AI- 10 14 - 0 3 - 0 3项目课题
关键词
蔷薇科
绣线菊亚科
花粉形态
Rosaceae, Spiraeoideae, Pollen morphology
