花粉

The development of anther and ovule followed the finish of the flower organ initiation. Pollen mother cells and well developed microsporagium wall occurred when the diameter of the bud reached about 3.0 mm, and the archesporial cell which played the role of megaspore mother cell formed in ovule when the diameter of the bud reached about 3.5 mm.

花药及胚珠的发育与花器官的形态发生之间有明显的连续性，当花蕾直径为3.0 mm左右时花粉母细胞及完整的花粉囊壁形成，直径达到3.5 mm左右时胚珠中出现孢原细胞的分化，它直接起大孢子母细胞的功能。

In first stage,from the beginning of pollination to megaspore tetrad,pollen tubes grow axially,passing through gynostemium to the ovary and from proximal placenta along ovary wall develop upward.

花粉在柱头上萌发和生长后，花粉管沿着花柱一直延伸到子房，进入胚囊释放精细胞，实现精卵结合，这就是亲和受精过程[1]。

It was thought that space induction caused the variation of size, fertility and the abnormal meiosis.

分析认为花粉的大小差异和花粉的育性与减数分裂异常有关，而这些现象都是航天诱变造成的

Pollination The transfer of pollen from the anther to the stigma in angiosperms, and from the sporangiophores to the micropyle in gymnosperms.

授粉：指在被子植物中花粉从花粉囊转移到柱头上，在裸子植物中从小孢子囊转移到珠孔。

Two of these protein bands, with a molecular weight of 12 000 Mr and 14 000 Mr, showed immunoreactivity with IgE in the sera from patients with allergy to pollen of Caryota ochlandra. For the pollen extract of Carvota mitis, 30 protein bands were detected in SDS-PAGE, and three of these protein bands, with a molecular weight of 12000, 14000, and 26000 Mr, showed immunoreactivity with IgE in the sera from patients with pollen allergy of Carvota mitis. The 14000 Mr protein was the major allergen. Result from the ion-exchange chromatography indicated that the two pollen allergens (12 000、14000 Mr) from Caryota ochlandra were eluted in the second peak. The major pollen allergen of Carvota mitis was eluted in the forth and fifth peak.

结果 长穗鱼尾葵花粉有30余条蛋白带，其中主要条带有18条，12000和14000 Mr为长穗鱼尾葵花粉特异性变应原；短穗鱼尾葵花粉有30余条蛋白带，其中主要条带有9条，26000、1200和14000 Mr为短穗鱼尾葵花粉特异性变应原，其中14000 Mr为主要变应原；通过离子交换层析方法纯化出长穗鱼尾葵花粉相对分子质量为12000和14000的变应原主要分布在Ⅱ峰中，短穗鱼尾葵花粉相对分子质量为14000阳的主要变应原分布在Ⅴ峰和Ⅵ峰中。

In this thesis, using Pinus yunnanensis and Nicotiana tabacum pollen as experimental material, we studied the regulation and control of calcium messenger system in pollen germination and tube growth.

我们以云南松和烟草为材料，试图阐明钙信使系统对花粉萌发和花粉管生长的调控。

Shortly after the pollen grain comes in contact with the nucellus, it germinates to form a pollen tube.

在不久之后，花粉谷粒用 nucellus 进来连络，它发芽形成花粉管。

In well preserved grains the aperture is covered by an operculum or operculum-like component.

在保存好的花粉上可观察到花粉孔被孔盖或似孔盖物所覆盖。

This indicates that seed production of the studied species must be reduced by available resources. To detect the difference of seed production between flowers pollinated by self and outcross pollen, hand pollination for bagged flowers has also been conducted in natural populations of the two Pedicularis species.

除了上述结果外，我们的人工实验还表明，人工补充授予同株或异株的花粉都未能增加种子产量，而疏花处理则明显的增加了剩余花的结实，这说明较之于花粉数量的限制而言，资源限制是影响这两种植物雌性育性的原因。

When the pollen density of pollen donor exceeded the critical density, the gene flow frequency did not increased any longer, and the maximum gene flow frequency detected was equal to the outcrossing rate of pollen receiver in theory.

在其他因素都固定的情况下，如果花粉受体的异交率较高，那么到该花粉受体的基因漂移频率也相对较高。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了