“孢原”造句
孢原细胞处于珠心表皮之下, 直接起大孢子母细胞的功能.
A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.
孢原细胞位于珠心表皮之下, 直接起大孢子母细胞的功能.
The ovule is bitegminous archesporial cell locates under the nucellus epidermis, which develops into functional megasporocyte.
小孢子
孢原为多细胞,小孢子母细胞减数分裂产生四面体型的小孢子四分体.
The tapetum begins to vary at the stage of tetrad with the cytoplasm anther cell.