合点端

平邑甜茶的无性胚囊原始细胞始于盛花期前后靠近合点端的珠心细胞，并很快发育为单核无性胚囊，盛花后5～7d的坐果初期形成无性的八核胚囊。

The aposporous initials , the nucellar cells in the chalazal end , developed during full blooming stage . Then it grew rapidly to unreduced embryo sac and formed 8-nuclei aposporous embryo sac , which happened 5 to 7 days after full bloom .

作者认为它们是起了合点端吸器的功能。

Perhaps they played the function as chalazal end of the haustorium .

小麦（Triticumaestivum）受精前成熟胚囊，除胚囊中央细胞的合点端细胞质中有酸性磷酸酶外，其余部位均未发现酸性磷酸酶。

No acid phosphatase activity was observed in the mature embryo sac of wheat ( Triticum aestivum ) except the chalazal cytoplasm of the central cell before fertilization .

开花后1～8h，卵细胞合点端无壁，其质膜和中央细胞质膜之间有较宽间隙，两质膜均有间断处。

After 1 ￣ 8 h of anthesis , the egg cell has no wall at its chalazal end and a space is present between the plasma membranes of the egg cell and central cell which are discontinuous .

Bessey认为种鳞不过是胚珠合点端增生的结果的独特结构说；

Bessey thought that the seed scale of conifers is the combined outgrowths of an ovule from its chalazal end , which is a sui generis structure thereafter .

核型胚乳，合点端具胚乳吸器。

Endosperm formation is nuclear type and the endosperm forms chalazal haustorium .

珠孔端3个退化，合点端为功能大孢子。

Generally , the chalazal megaspore functions while the remaining three degenerate .

在功能大孢子靠近合点端一侧有吞噬结构，其内含有结构模糊的细胞器。

Phagosomes with degenerated organelles are visible in functional megaspore at chalazal side .

包含游离核的合点端胚乳部分形成几个裂片。

The chalazal parts of the endosperm containing free nuclei forms several lobes .

合点端有明显的承珠盘结构。

Chalaza end had characteristic hypostase structure .

胚分化出子叶时，胚乳吸器自合点端向珠孔端退化。

When the embryo differentiated cotyledons , the haustorium cells gradually degenerated , then disappear .

大孢子排列为直线型，合点端大孢子为功能大孢子。

Arrangement of megaspore is linear shaped , the megaspore of chalazal end is functional megaspore .

开花时胚囊已发育成熟，此时卵细胞在合点端部分区域是裸的；

Most part of egg wall at the chalazal end disappears at the day of anthesis ;

球形胚晚期吸器自珠孔端向合点端逐渐细胞化。

The haustorium cellularizated from the micropylar end to chalazal end at the later globular stage .

合子合点端壁由不连续到连续，细胞器丰富。

The chalazal end wall of the zygote which contains abundant organelles changes from discontinuous to complete .

成熟胚囊期，合点端部分珠心细胞特化为承珠盘。

At the mature embryo sac stage , some nucellar cells at the chalazal region differentiated into hypostase .

极核融合为次生核，并位于卵细胞合点端附近；

Two polar nucleus fused into the secondary nucleus , and located near the chalazal end of egg cell ;

有性生殖胚囊内的4个大孢子呈直线排列，仅合点端的1个大孢子形成功能大孢子。

Four Megaspore array linear in Sexual embryo sac , only the megaspore at chalazal end formed functional megaspore .

粗线期以后，合点端细胞壁首先出现尖帽状荧光区。

Fluorescence indicating the presence of callose first appeared in the wall of chalazal pole of megasporocyte at pachytene stage .

细胞外被细胞壁，其合点端及侧方与助细胞共同壁不连续。

The cell wall surrounds the cell , but its chalzal ends and the lateral wall with synergid is discontinuous .

细胞质主要分布在合点端，细胞器呈不活跃状态。

The cytoplasm of the egg cell is mainly located at its chalazal portion in which the organelles are inactive .

受精前二极核合并成次生核或不合并，位于卵细胞的合点端。

The pair polar nuclei lie in chalazal end to egg before fertilization , which fuse into a secondary nucleus or not ;

次生极核于合点端受精后，逐渐分裂形成细胞。

After the newborn endosperm nuclei divided , the cells were formed step by step from the chalaza side to the micropyle side .

胚乳为核型胚乳。胚囊合点端胚乳保持游离核状态，成为胚乳舍点吸器。

The endosperm is of the Nuclear type , without cellularization the chalazal region of endosperm remains free nuclear and becomes a chalazal haustorium .

心形胚期，除合点端保持游离核胚乳吸器外，其余部分完成胚乳细胞化。

At the heart embryo stage , endosperm forms a free nuclei haustorium at the chalazal end , and finishes cellularization at other partion .

胚乳发育为核型，珠孔端胚乳细胞化，合点端保持游离核状态。

The endosperm development follows the nuclear type . The endosperm cells form at the micropylar end , and remain free nuclear phase at chalazal end .

胚囊发育类型为英地百合型，合点端形成胚囊吸器。

Endosperm formation is nuclear type and the endosperm forms chalazal haustorium . With embryo sac haustorium in chalazal end , the embryo sac is Endymion type .

合点端的二分体细胞中细胞器丰富，线粒体和质体的形态正常，表明完成了再分化。

The chalazal cell in the dyad contains many organelles , and mitochondria and plastids showing regular shapes , considered a sign of the end of redifferentiation .

大孢子孢原细胞2~3个，其中1个发育为大孢子母细胞，大孢子母细胞减数分裂形成直线四分体，合点端的大孢子为功能大孢子，珠孔端3个大孢子退化。

Hypodermal archesporium is 2 or 3 cells ; a single cell well developed into megaspore mother cell . Undergoes meiotic divisions , produces a linear tetrad .

3月下旬大孢子母细胞形成，4月初进行减数分裂形成四分体，功能大孢子位于近合点端。

The megasporocyte forms in late March and undergoes meiosis to form the megaspore tetrad in early April , The functional megaspore lies nearby the chalaza end .