六个不同类型荞麦花花粉粒形态的电镜观察比较研究

Study on pollen morphology of six kinds of buck-wheat flowers by means of electric microscope

对二倍体甜荞长花柱类型 (ES2 s)、二倍体甜荞短花柱类型 (ES2 S)、四倍体甜荞长花柱类型 (ES4s)、四倍体甜荞短花柱类型 (ES4S)、四倍体有翅细野荞 (GR4HI)、四倍体无翅细野荞 (GR4HO)等 6个不同荞麦类型花的花粉形态学进行了电镜观察。结果表明 :这些荞麦类型的花粉粒都是椭圆形 ,都有网状纹饰、3孔沟等特征。二倍体甜荞染色体加倍后形成的四倍体甜荞 ,相对于二倍体甜荞而言 ,花粉粒显著增大和明显变圆。无论二倍体还是四倍体甜荞 ,其长花柱型花的花粉粒都比其对应短花柱型花的花粉粒要小。尽管四倍体甜荞和四倍体细野荞在染色体数目和倍性上一样 ,但是它们在花粉粒的大小上有显著差异。

Pollen morphology of six kinds of buckwheat( Fagopyrum )flowers was studied by means of electric microscope. The results suggested that these buckwheat flowers have tricolporate, elliptic or subspheroidal pollen grains with reticulate aculpture. Tetraploid F. esculentum has rounder and much bigger pollen grains than its diploid F. esculentum . In diploid and tetraploid F. esculentum , the long style type of flowers has smaller pollen grains than their corresponding short style type of flowers. In spite of the common number and ploidy chromosoms,there is much difference between tetraploid F.gracilipes and tetraploid F.esculntum in pollen grains. Besides, in F. gracilipes , the type with wings has pollen grains similar to that without wings.