minute opening in the wall of an ovule through which the pollen tube enters
造句
用作名詞(n.)
The micropyle was formed by the inner integument. 珠孔由內(nèi)珠被形成。
The development of the obturator and the micropyle correlates with that of the female gametophyte in P. amurense. 黃檗珠孔塞和珠孔的發(fā)育與雌配子體發(fā)育存在密切關(guān)系。