Pollen shape and size 花粉粒特征
The results showed that there were obvious differences among the pollen grains in terms of pollen size, 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；
Except for some differences in exine ornamentation and pollen size, 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。
To find the reason of low seed-setting of red Pitaya, it compared flower shape, pollen size and pollen viability between red pitaya and white pitaya flower.
本试验通过红肉火龙果和白肉火龙果花的外形、花粉粒大小和生活力的差异比较，探究红肉火龙果授粉结实率低的原因。
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