花粉

Some contain summertime pollen noxiousness, be in this

夏季的花粉有些含有毒性，在这个

When the pollen grains reach the nucellus, they germinate immediately and produce short tubes.

花粉借助传粉滴吸进珠孔道，再进入传粉室中进行萌发。

As the pollination drops evaporate, they contract, carrying the pollen grains through the micropylar canal and into contract with the nucellus.

当做授粉下降蒸发，他们缩短，经过 micropylar 运河携带花粉谷粒和进入契约之内以 nucellus。

In this genus, the pollen grains are oblate spheroid with 3 colpi in polar view, and smoothy on the surface .

结果表明该属花粉粒多为近球形，具3沟，表面光滑。

This observation does not support the idea that the obturator mainly serves the function of mechanical guidance for the growth of pollen tubes.

我们不支持先前研究者关于珠孔塞主要充当对花粉管生长的机械作用的观点。

These microscopic characteristics of pollen grain and stomata could be used as the evidence to identify diaploid spieces and hexaploid, octoploid spieces whose chromosome ploidies are hugely different.

结论］用花粉粒和气孔的一些微观特征作为鉴别二倍体和六倍体、八倍体等染色体组倍数相差较大的物种有一定的依据。

Pollen plants from octoploid triticale anther culture were propagated as clone linesand had been used as anther donors for further culture in two successive years....

由八倍体小黑麦花培所得的花粉植株再进行一次花培，在所获得的 C 类植株中就能选出花培效率达到八倍体小黑麦水平的个体。

Diploid species and hexaploid, octoploid species of triticeae had remarkable differences in micro-morphological characteristics of pollen grain and stomata. However, some differences between hexaploid species and octoploid species were not significant.

可见，小麦族二倍体物种与六倍体物种、八倍体物种在花粉粒和气孔的微观特征方面有明显差异，但六倍体和八倍体物种之间差异不明显。

Comparison of the micro-morphological characteristics of pollen grain and leaf epiderm among diaploid Thinopyrum elongatum, Elytrigia intermedia, common wheat and octoploid Tritielytrigia types were carried out by observation under scanning electronic microscope.

方法］通过扫描电镜对二倍体长穗偃麦草、中间偃麦草、普通小麦、和八倍体小偃麦的花粉粒和叶表面的微观形貌特征进行了比较。

Once they had identified the orchid, Ramírez and his colleagues could use it to address an old debate about the age of the orchid family.

一旦这些花粉被确认来自兰花，Ramirez和他的团队可能会利用这个研究成果就学界一个古老的议题发表报告：兰花家族究竟多大？

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。