半夏种内不同居群花粉粒形态比较研究

目的:研究半夏不同居群的花粉粒形态特征,以便为进一步研究半夏的遗传多样性提供孢粉学资料。方法:借助扫描电镜对栽培在同一生境下的18个半夏居群的花粉形态、大小及表面纹饰等特征进行观测比较。结果与讨论:半夏各居群的花粉粒大小存在较大的差异:17个有珠芽半夏居群花粉粒的平均值为17.42μm×14.86μm,其中花粉粒最大的姜堰居群为20.43μm×18.16μm,而最小的沛县居群仅有15.23μm×12.82μm,灵谷寺无珠芽半夏居群的花粉粒大小明显小于所有有珠芽半夏居群,仅有13.23μm×11.98μm;各半夏居群花粉粒表面均具刺状突起,但刺的长短、疏密及刺端和刺基变化因居群不同而有所不同;半夏花粉粒可能为有孔盖萌发孔类型。

Study on morphological characteristics of pollen grains of Pinellia ternata in different populations

OBJECTIVE: To study the genetic diversity of pollen grains morphologies of Pinellia ternata in different populations and supply palynological evidences for further research. METHOD: Pollen exine ultrastructure were compared for 18 populations growing under in the same environment by means of scanning electron microscope(SEM). RESULT AND CONCLUSION: Big difference was found in pollen size among populations of P. ternata: the mean value of seventeen populations of P. ternata with bulbils was 17.42 microm x 14.86 microm, the biggest of populations originated from Jangyan city is 20.43 micromx 18.16 microm, but the least originated from Peixian County is only 15.23 microm x 12.82 microm; the size of populations without bulbils originated from Linguo Temple side was only 13.23 microm x 11.98 microm and far less than of all populations with bulbils. The pollen surface of all populations sticks out with spines, varying in size and density, the base and top part of spinules was different among populations. The pollen grains patterns of germination apertures of P. ternata was likely to have colpate cover.