四分体时期，绒毡层细胞内部结构开始解体。
In tetrad stage, the structures of tapetal cells begin to dissociate.
单瓣紫花木槿的小孢子母细胞经过减数分裂形成四面体状的四分体，成熟花粉是二细胞型花粉，圆球型，表面有刺毛。
The results showed that the type of microsporic tetrads of the simple flower is belong to tetrahedral type and the mature pollen is two-celled with bristles on the surface.
小孢子四分体为四面体型排列，成熟花粉有2 -细胞和3 -细胞型2种。
The microspores are arranged in a tetrahedral tetrad. The mature pollen grains are of the 2-celled and 3-celled types.
结果发现小孢子母细胞和四分体小孢子中积累了一些脂滴，但没有淀粉。
The results showed that microspore mother cells and tetrad microspores accumulated numerous lipids but no starches.
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。
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. ).
花粉败育的过程从四分体开始，细胞质内液泡逐渐增大，接着细胞器解体，细胞核解体。
The process of pollen abortion begins with vacuole formation and gradual enlargement in the tetrad.
空囊产生的主要途径：①四分体至单核早期绒毡层细胞体积发生明显的增大、液化；
The main pathways of causing empty anther sacs are obvious enlargement and liquidization of tapetum cells from tetrad to slope nucleus early period;
空囊产生的主要途径：①四分体至单核早期绒毡层细胞体积发生明显的增大、液化；
The main pathways of causing empty anther sacs are obvious enlargement and liquidization of tapetum cells from tetrad to slope nucleus early period;
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