The results showed that there were obvious differences among the pollen grains in terms of pollensize, shape, colour and surface structures.
结果表明：所研究的植物花粉粒在大小、形态、萌发器官和外壁纹饰上有明显差异；
2
Except for some differences in exine ornamentation and pollensize, there is no great evolutionary divergence among genera in pollen morphology.
总体来讲，花粉没有大的演化分异，只是表面纹饰和花粉大小有一定的差异。
3
To find the reason of low seed-setting of red Pitaya, it compared flower shape, pollensize and pollen viability between red pitaya and white pitaya flower.