查询词典 pollen sac

In the late of April of the second year, male inflorescences unbound and pollinated. When female inflorescences accepted the pollen grains, ovary development was increased in early May. With the development of either of the two ovule, funiculus, integument and nucellus were differentiated. Embryo sac mother cell came into being and the meiosis begins. Then fuctional megaspore developed into matured embryo sac that contain eight nucleuses. In the end of May, double fertilization generated.

次年，4月下旬，雄花序解螺旋散粉，雌花序开花授粉；5月上旬，雌花序授粉后，迅速增长，子房膨大，两个胚珠分化出珠柄、珠被和珠心，珠心中产生孢原细胞；5月中下旬，大孢子母细胞形成并减数分裂，功能性大孢子形成成熟的八核胚囊；5月底，发生双受精。

In third stage,at maturing of the embryo sac,pollen tubes grow directionally toward micropyle into embryo sac.

然而由于技术上存在困难，有关花粉管活体状态下生长的研究很少[1]。

The capacity of dehiscent anther was determined to the size and the morpha of anther stomium cell, epidermal cell and fibrous stratum's plastic property of the pollen sac wall.

成熟花药开裂的能力与花药裂口细胞的大小、形态有关，同时又与成熟花粉囊壁的表皮细胞和纤维层细胞的可塑性结构功能有关。

A hummingbird's bill so nearly matches the color of this Panamanian orchid's pollen sac that the bundle is often borne away unnoticed.

这个蜂鸟的头部羽毛和这只巴拿马兰花的颜色如此相近，以至于花束经常在不经意间就不见了。

Are tetradynamous stamen. Each anther has four pollen sac.

结果是：菥蓂雄蕊为四强雄蕊，每个花药具 4 个花粉囊。

Morphological and cytological observations showed that the pol CMS plants in DGCMS Yi 3A were complete male sterile, had no pollen sac differentiation and had smaller petals and stamens at higher temperature situation.

花器形态和花药发育的解剖学观察结果表明，DGCMS-宜 3A中表现波里马细胞质雄性不育的植株，其花器形态和花药发育的解剖学特点与 pol CMS相同，即在高温条件下，花瓣较小，表现彻底不育，无花粉囊的分化；在低温条件下，花瓣变大，表现部分雄性不育，可分化出 1～ 4个花粉囊，并产生一定数量可育花粉。

Morphological and anatomical observations showed that the pol CMS plants in RGCMS?117A or RGCMS S45A were complete male sterile ,had no pollen sac differentiation and had smaller petals and stamens at higher temperature situation.

花器形态和花药发育的解剖学观察表明，RGCMS S45A和RGCMS 117A中表现波里马细胞质雄性不育的植株，其花器形态和花药发育的解剖学特点与polCMS相同，即在高温条件下，花瓣较小，表现彻底不育，无花粉囊的分化；在低温条件下，花瓣变大，表现部分雄性不育，可分化出 1～ 4个花粉囊，并产生一定数量可育花粉。

Inflorescence an axillary heads; flowers bisexual, petals5, white, ribbon-like,1.5 cm long; stamens5, filaments very short, anthers ovoid, with2 pollen sac opening each by2 vertical valves, connectives exserted; staminodes5, bifid.

头状花序腋生，花两性，花瓣5，白色，带状，长1.5厘米；雄蕊5，花丝极短，花药卵形，具2个各2瓣裂的花粉囊，药隔突出；退化雄蕊5，叉状分裂。

Monosomic 3, monosomic 5, monosomic 10, trisomic 4 and trisomic 5 as experiment materials, their meiosis behavior of pollen mother cell, pollen characteristics, physiological and biochemical characteristics of anther, section observation of pollen development and the structure of embryo sac were studied, and the effects on the seed set and transmission rate were analyzed.

本文以大白菜同源四倍体小孢子培养产生的且已鉴定为3号单体、5号单体、10号单体、4号初级三体、5号初级三体的非整倍体株系及二倍体株系等为试材，对各材料的结籽率、雄配子传递率进行了统计，并对花粉母细胞减数分裂行为、花粉特性、花粉发育和胚囊结构以及花药生理生化特性等方面进行了观察研究，进而分析了其对大白菜单体n-1雄配子和三体n+1雄配子传递率的影响。

The sac structure projected through the pollen aperture possesses the typical nature of transfer cell, i. e complex lybrinthian wall ingrowth and abundant mitochondria, RER, dicotysomes and ribosomes under the wall. Its outer surface is closely related to the tapetal protoplast. The accumulation of storaged material in pollen start at the area near the apertures. Above restults indicate the pollen apertures may be the"door"from where nutrition flows into pollen in P. hortorum.

绒毡层物质向花粉粒的短途运输明显的表现在花粉的萌发孔区，一方面形成向外突起的囊腔，另一方面在这里具有发达的壁迷宫，而且迷宫下具丰富的线粒体，RER和高尔基体等细胞器，此外花粉内贮藏物的大量积累首先从萌发孔附近开始以及萌发孔处与绒毡层有紧密接触都说明天竺葵花粉萌发孔可能是物质进入花粉的&门户&。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。