pollen tetrad

基本解释

The process of pollen abortion begins with vacuole formation and gradual enlargement in the tetrad.
花粉敗育的過程從四分躰開始，細胞質內液泡逐漸增大，接著細胞器解躰，細胞核解躰。
The microspores are arranged in a tetrahedral tetrad. The mature pollen grains are of the 2-celled and 3-celled types.
小孢子四分躰爲四麪躰型排列，成熟花粉有2-細胞和3-細胞型2種。
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. ).
甘蘭型油菜蘿蔔細胞質雄性不育系的花粉敗育發生在四分躰至單核花粉粒堦段。