It is better to use the grain amount of single pollen in its main pollen season to analyze the relationship with meteorological factors.

在分析气象因素与空中飘散花粉粒数的相关性时，最好选择单种花粉粒，并选择其飘散较为稳定的时段进行。

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There occurs pollen abortion during the stage from tetrad to single nucleus pollen grain of cytoplasmic male-sterile line in Brassica napus Var. oleifera(Raphanus sativus L. ).

甘兰型油菜萝卜细胞质雄性不育系的花粉败育发生在四分体至单核花粉粒阶段。

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