花粉

Based on the fossil records, it is found that no credible megafossil record of Magnoliaceae exists in Jurassic deposits and all Jurassic microfossil reports remain equivocal and require further study up to now.

通过整理和分析木兰科植物的化石记录发现：不论是植物大化石还是花粉，迄今为止在白垩纪以前地层中尚无可靠的记录。

The purpose of this study was to establish an efficient and stable gene transfer system for Phalaenopsis via pollen tube pathway. For this purpose, the growth and development of ovary and megaspore mother cell in Phalaenopsis was microscopically examined.

本研究主要是以花粉管法进行蝴蝶兰之基因转殖，希望建立效率高且稳定的转殖系统，以应用於蝴蝶兰育种。

Pollens germinated readily 3 days after pollination and megaspore mother cells underwent meiotic division at about 50 days after pollination.

本试验主要分为两部分；花粉管生长及受精之观察：蝴蝶兰之子房和大孢子母细胞，於授粉后才开始发育。

Meiosis of pollen mother cells of t he mutant and its receptor(line 814527) were observed.

对该不育变异体和受体花粉母细胞减数分裂过程进行观察。

Meiosis of pollen mother cells of the mutant and its receptor(line 814527) were observed.

对该不育变异体和受体花粉母细胞减数分裂过程进行观察。

"Leave it outside for five to six hours and the pollen residue that's on your car, you can actually write your name in," says Melton.

"给它以外的5至6小时，花粉残渣，关于汽车的，你其实可以写你的名字，"梅尔顿说。

Allergy sufferer Steve Melton does what he can to avoid exposure to spring pollens, but it's nearly impossible.

过敏症患者史蒂夫梅尔顿做什么，他能避免接触到春季花粉，但它几乎是不可能的。

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]。

Porogamy The usual method of fertilization in angiosperms in which the pollen tube enters the ovule by the micropyle.

珠孔受精：被子植物通常的受精方式。花粉管通过珠孔进入胚珠。

A pollen tube growing through the micropyle and interspace of the nucellus epidermis releases two sperms into one synergid.

花粉管经珠孔及珠心表皮细胞间隙进入一个助细胞，释放精子。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。