大孢子

大孢子母细胞及二、四核胚囊的核质显示Feulgen正反应。

The nuclear plasm of megaspore and 2 and 4 nucleate embryosac shows a positive Feulgen reaction .

反映大孢子发育和贮粉室发生的同步性。

This shows a synchronous development of megaspore and pollen chamber .

高水平的ZT/IAA有利于大孢子母细胞和花粉粒的形成，而大孢子四分体的形成则需要高的GA3/ZT比值。

It appears however that the formation of megaspore tetrad associated with the high GA3 / ZT ratio .

ABA则与大孢子和成熟胚囊形成有关。

High content of ABA is related with the formation of embryo sac and its maturity .

紫荆（CercischinensisBunge）大孢子发生及雌配子体发育的研究

The studies of Megasporogenesis and megagametogenesis of Cercis chinensis Bunge

授粉后2h，蕾期授粉的对照已经完成大孢子的第三次有丝分裂；

Two hours after pollination , the third mitosis of megaspore completes in CK of BP ;

GA3对大孢子的形成、受精作用和胚胎发育有关。

Both embryo sac generation and double fertilization correlated with GA3 . the changeable content of GA3 and IAA is related with embryo development .

本文报道了山茱萸（Cornusofficinalissieb.etZucc.）山茱萸的大孢子发生和雌配子体发育

Macrosporogenesis and Development of the Female Gametophyte in Cornus officinalis Sieb . et Zucc

大孢子母细胞、大孢子四分体及功能大孢子中含较少不溶性多糖，但却含丰富的RNA和蛋白质。

The insoluble polysaccharides are at very low level in the MMC , tetrads and functional megaspore stages while RNA and protein are at higher level in all of them .

桔梗（PlatycodongrandiflorumA.DC）胚胎学研究&Ⅱ.大孢子发生、雌配子体发育、胚及胚乳发育

Embryonic Studies On Platycodon grandiflorum A. DC II - Megasporogenesis And Female Gametophyte , Embryo and Endosperm Developments

延龄草（TrilliumtschonoskiiMaxim.）的胚胎学研究初报Ⅰ.&大孢子的发生及雌配子体的形成

Investigation on embryology of Trillium tschonoskii maxim . ⅰ . & megasporogenesis and the formation of the female gametophyte

对早开堇菜（ViolaprionanthaBunge）大孢子的发生和雌配子体发育的观察结果显示，早开堇菜子房1室，3心皮；

Observed on Viola prionantha Bunge the development of megasporogenesis and the formation of female gametophyte , results demonstrated that , Viola prionantha Bunge ovary 1 room early , 3 carpels ;

金针菜的孢原细胞在花蕾长0.5cm左右时形成，孢原细胞直接发育为大孢子母细胞。

The archesporial cell is formed when the alabastrum length reaches 0 . 5 cm or so and the macrosporocyte develops from the archesporial cell directly .

对9个链格孢小孢子种和3个大孢子种共20个链格孢菌株的5.8Srdna及其两侧的ITS1区和ITS2区进行了序列分析。

: The sequences coding for the 5.8S rDNA and the flanking internal transcribed spacers ( ITS1 and ITS2 ) were amplified by PCR and sequenced from 9 small-spored species and other 3 large-species in Alternaria .

蓼型（Polygonum-type）胚囊大孢子母细胞减数分裂时，其珠孔端细胞壁出现胼胝质荧光，并逐渐扩展到整个细胞壁。

Polygonum-type & During the process of megasporocyte meiosis , callose occurs first in the wall of megasporocyte from micropylar end , then gradually envelops the whole cell .

授粉70d，常温下的蝴蝶兰植株已完成雌配子体发育和双受精，而低温处理的蝴蝶兰仍未完成大孢子的发生过程。

Although the megagametophyte formed and even the double fertilization had been finished 70 days after pollination at normal temperature , the megasporogenesis had not yet been finished at low temperature .

低温（12-18℃）处理的蝴蝶兰，授粉50d开始分化胚珠原基、60d胚囊处于大孢子母细胞时期，比常温（20-25℃）下的推迟10-15d；

The differentiation of ovule primordium of a hybrid of Phalaenopsis initiated at low temperature ( 12-18 ℃) 50 days after pollination , and megasporogenesis appeared 60 days after pollination . The megasporogenesis at normal temperature ( 20-25 ℃) was delayed for 10-15 days .

结果表明，韭型（Alliumodorum-type）胚囊大孢子发生时，自大孢子母细胞的珠孔端细胞壁内出现胼胝质荧光，并逐渐扩展到整个细胞壁，中期Ⅰ至末期Ⅰ细胞壁呈现胼胝质荧光。

The results are as follows : Allium odorum-type & Callose first occurs in the wall of megasporocyte from the micropylar end , then gradually envelops the whole cell . Megasporocyte is surrounded by the wall with callose during metaphase ⅰ, anaphase ⅰ and telephase ⅰ .

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 .

毛百合大孢子发生与雌配子体发育的细胞学观察

Cytological Observation on Megasporogenesis and Female Gametophyte Development of Lilium dauricum Ker-Gawler

江苏句容泥盆-石炭纪大孢子的补充研究

A complementary study on megaspores from DEVONIAN-CARBONIFEROUS transition in jurong , Jiangsu

石刁柏大孢子发生和发育的细胞学观察

Cytological Observation on Macrosporogenesis and Development in Asparagus Officinalis

七叶一枝花的大孢子发生、雌配子体形成及多糖变化的观察

Observations on Megasporogenesis and megagametogenesis and changes in polysaccharides in Paris polyphylla SM

三倍体食用蕉大孢子败育的胚胎学研究

Embryological studies of megaspore abortion of eating triploid banana

大孢子母细胞经过两次减数分裂形成四个大孢子，沿胚珠长轴排成一列，即线形四分体。

The megaspore mother cell undergoes meiosis to form four megaspore in line .

初生造孢细胞直接形成大孢子母细胞。

Primary sporogenous cell forms directly megaspore mother cell .

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 .

银杏大孢子形成的超微结构研究

Ultrastructural Studies on Megaspore Formation in Ginkgo biloba

陕北中三叠世一种石松植物的大孢子研究

Studies on the megaspores of a mid - triassic lycopsid in Shaanxi , china

珠心表皮下的雌性孢原直接发育为大孢子母细胞。

The archesporial cell below nucellus epiderm functions directly as the megaspore mother cell .