A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.
孢原细胞处于珠心表皮之下, 直接起大孢子母细胞的功能.
Activation of nucellar cells by discharge from the pollen tubes has been claimed.
认为由花粉管的流出物能使珠心细胞活化.
The nucellar epidermal cell cuts off several layer nucellar parietal cells.
珠心表皮细胞平周分裂产生多层珠心周缘细胞,为厚珠心.