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secondary endosperm
相关语句
  次生胚乳
     During the formation of secondary endosperm,the rest endosperm cells degenerate gradually.
     此种后形成的胚乳,我们称之为次生胚乳
短句来源
     In the later stage ,a secondary endosperm develops in the periphery of the endosperm , while the inner endosperm cells degenerate and disintegrate.
     后期胚乳组织外层形成“次生胚乳”,原胚乳细胞逐渐退化解体。
短句来源
  相似匹配句对
     The secondary disaster
     二次灾难
短句来源
     Secondary cut
     二次掏槽
短句来源
     During the formation of secondary endosperm,the rest endosperm cells degenerate gradually.
     此种后形成的胚乳,我们称之为次生胚乳。
短句来源
     The other sperm nucleus fused with the secondary nucleus to form primary endosperm nucleus.
     另一精核与次生核融合形成初生胚乳核。
短句来源
     The endosperm is cellular type.
     胚乳发育为细胞型。
短句来源
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1.The development of the embryo of roxburgh rose(Rosa roxburghii Tratt.f.normalis Rehd.et Wils.)conforms to the Asterad type with significant variation of forming an oblique wall after the division of the apical cell.A wedge-shaped epiphysis initial is cut off and re- mained in early stages of proembryo.The mature embryo is typical in dicotyledons and ac- cumunates large amount of protein bodies in its two cotyledons.2.The endosperm formation is nuclear type.Since the free nuclei become completely separated...

1.The development of the embryo of roxburgh rose(Rosa roxburghii Tratt.f.normalis Rehd.et Wils.)conforms to the Asterad type with significant variation of forming an oblique wall after the division of the apical cell.A wedge-shaped epiphysis initial is cut off and re- mained in early stages of proembryo.The mature embryo is typical in dicotyledons and ac- cumunates large amount of protein bodies in its two cotyledons.2.The endosperm formation is nuclear type.Since the free nuclei become completely separated by the cell wall,the cells in the stirface layer of the cellular endosperm may divide periclinally to form a stratified cell zone,as we called secondary endosperm,lining along the boundary of the embryo sac.During the formation of secondary endosperm,the rest endosperm cells degenerate gradually.In ma- ture seed only the secondary endosperm persists and contacts directly with the mature embryo, except at the chalazal end,where it degenerates earlier.3.The results of this study reveal that degneration of embryo and endoeperm at early stages of embryogeny in some ovules,perhaps caused by the insufficiency of nutrients,may be one of the reasons of seed abortion.

本研究对单瓣刺梨胚及胚乳的发育过程进行了观察,获得如下主要结果:1.刺梨胚的发育属于紫菀型的一种变异类型。原胚发育早期,在胚体顶端具有明显的胚芽原细胞。成熟胚为典型的双子叶植物胚的形态,在子叶中贮藏大量的蛋白质粒。2.刺梨的胚乳属核型。经游离核时期以后形成胚乳细胞。紧邻胚囊周界壁的表层胚乳细胞可以进行平周分裂,产生层叠状的胚乳周缘层。此种后形成的胚乳,我们称之为次生胚乳。当次生胚乳形成时,其余的胚乳细胞逐渐解体,最后几乎完全消失。次生胚乳只在合点处解体,其余保留至种子成熟。3.发现了开花后一些胚珠中无胚或胚和胚乳在发育早期退化的现象,可认为是刺梨种子不育的一个重要原因。

Phellodendron amurense Rupr. is a dioecious tree with abortive carpels in the staminate flower and abortive stamens in the pistillate flower. The anther wall conforms to the basic type. The tapetum, of which each cell contains 2 or more nuclei in the later stages, is the glandular type. The cytokinesis of the microspore mother cells in meiosis is the simultaneous type. The microspores are arranged in a tetrahedral tetrad. The mature pollen grains are of the 2-celled and 3-celled types. The ovary is 5-locular....

Phellodendron amurense Rupr. is a dioecious tree with abortive carpels in the staminate flower and abortive stamens in the pistillate flower. The anther wall conforms to the basic type. The tapetum, of which each cell contains 2 or more nuclei in the later stages, is the glandular type. The cytokinesis of the microspore mother cells in meiosis is the simultaneous type. The microspores are arranged in a tetrahedral tetrad. The mature pollen grains are of the 2-celled and 3-celled types. The ovary is 5-locular. The placentation is axile. The ovule is biteguminous, crassinucellate and anatropous. The female archesporium is multicellular. The megaspore tetrad is linear arrangement or occassionally T-shaped. The functional megaspore in the linear tetrad is the one at the chalazal end. The development of the embryo sac is the polygonum type. The double fertilization belongs to the premitotic type of syngamy. The embryo develops to conform the chenopodiad type. The endosperm develops to be the nuclear type. In the later stage ,a secondary endosperm develops in the periphery of the endosperm , while the inner endosperm cells degenerate and disintegrate.

黄檗(PhellodendronamurenseRupr.)为雌雄异株植物,雌花中有退化的雄蕊原基,雄花中有退化的心皮。黄檗花药壁发育为基本型。腺质绒毡层,细胞双核或多核。小孢子母细胞减数分裂为同时型。小孢子四分体为四面体型排列,成熟花粉有2-细胞和3-细胞型2种。子房5室,中轴胎座、倒生胚珠、具珠柄珠孔塞、双珠被、厚珠心和多孢原细胞。大孢子四分体为直线型、少数为“T”型排列,合点端的一个为功能性大孢子。蓼型胚囊,双受精属于有丝分裂前配子融合类型。胚的发育为藜型,核型胚乳。后期胚乳组织外层形成“次生胚乳”,原胚乳细胞逐渐退化解体。

 
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