常見例句At the time of pre-dehiscence, the epidermal and endothecium are still intact. 花藥開裂前,表皮及內(nèi)壁層仍保持完整。The anther wall is composed of four layers: epidermis, endothecium, middle layer and tapetum. 巨龍竹的花藥壁由4層結(jié)構(gòu)組成,包括表皮、藥室內(nèi)壁、中層、絨氈層;Anatomical observation showed that anther wall browning took place mainly in epidermis and endothecium. 結(jié)果表明:藥壁褐變主要發(fā)生在表皮與藥室內(nèi)壁。The anther wall consist of an epidermis, one endothecium, 1 to 2 middle layer and 1 to 2 tapetum in December. 花藥壁層由一層表皮層,一層內(nèi)壁層,一或二層中間層,一或二層營養(yǎng)層所構(gòu)成。The endothecium and epidermis persist.Cytokinesis in the microsporocyte meiosis is simultaneous type and the microspore teads are tetrahedral. 藥室內(nèi)壁纖維狀加厚;藥壁表皮宿存.;小孢子母細(xì)胞減數(shù)分裂為同時型;At the late microspore stage, the degeneration of the tapetal cell begins, and the thickening of the endothecium cell wall by callose happens. 小孢子晚期,絨氈層細(xì)胞開始解體,藥室內(nèi)壁細(xì)胞開始加厚,其加厚的物質(zhì)為胼胝質(zhì)類物質(zhì)。 返回 endothecium