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.
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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.
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孢原细胞处于珠心表皮之下, 直接起大孢子母细胞的功能.
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珠心胚发育经历与合子胚相同的发育阶段.
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In mature embryo sac, the nucellar cap is composed of 2~7 layer of cells.
珠心帽在胚囊成熟时, 具有2~7层细胞.
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雌配子体发育的特点是:倒生胚珠、基底胎座、厚珠心、双珠被、孢原细胞直接长大成大孢子母细胞、反足细胞退化早,胚珠发育为蓼型。
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