tube nucleus

• 粉管核

tube nucleus的用法和样例：

例句

1. The tube nucleus disintegrates as the pollen tube penetrates the nucellus.
   另外的粉管核会在花粉管穿过珠心时发生分裂。
2. The two sperm nuclei and the tube nucleus are all derived from a single microspore nucleus by mitosis.
   两个精核和管核都是从同一个小孢子核有丝分裂产生的。