查询词典 pollen

Pollen viability, stigmatic receptivity, the color of anther and stigma of 5 Iris plants were observed during blooming. Result:①The highest pollen viability was in 4 hours after blooming;②The stigmatic receptivities of I.

用醋酸洋红法测定了白花马蔺、马蔺、四川鸢尾、薄叶鸢尾和锐果鸢尾5种植物的花粉活力，用联苯胺-过氧化氢法测定其柱头可授性，同时观测了花药颜色变化和柱头颜色变化。

During the fertilization of angiosperms, the degenerated synergid induces a pollen tube to enter and break the pollen tube to release two sperm cells, which fuse with the egg and central cell.

在受精过程中，助细胞吸引花粉管向雌配子体生长，并接受花粉管长入细胞程序死亡助细胞中。接下来的花粉管停止生长和花粉管顶端破裂释放出2个精细胞的过程可能也依赖于助细胞。

CaM mRNA was substantially expressed in thetapetum, stigma, pollen tube track, degenerated synergid and transfusion parenchymacells. Lesser but yet significant amounts of CaM mRNA were also localized in themicrospore mother cells, microspores, pollen, antipodal cells, egg cell and central cell.

钙调素mRNA在绒毡层、柱头、花粉管生长途径、退化助细胞以及维管薄壁细胞中大量表达，也可在小孢子母细胞、小孢子、花粉、反足细胞、卵细胞以及中央细胞中检测到。

It takes about 0.5 h for a pollen tube from germination to arrive at the micropyle. About 0.5 h after pollination, the pollen tube releases two sperms into one synergid. At 0.5-2.5 h after pollination, the egg cell fuses with one sperm to form a zygote. About 10.0 h after pollination, the division of the zygote begins. The duration of the zygote lasts about 2.5-10.0 h. However, one sperm nucleus fuses with two polar nuclei at 1.0-3.0 h after pollination, and 5.0 h after pollination the primary endosperm nucleus begins to divide.

水稻受精过程经历的时间表如下：授粉后，花粉在柱头萌发；花粉萌发至花粉管进入珠孔大约需要0.5小时；授粉后0.5小时左右，花粉管进入一个助细胞，释放精子；授粉后0.5-2.5小时，精卵融合形成合子；授粉后约10.0小时，合子第1次分裂，合子期为授粉后2.5-10.0小时；授粉后1.0-3.0小时，精核与两极核融合；授粉后约5.0小时，初生胚乳核分裂。

Results show that sucrose medium was the best and can see pollen tubes sprout directly;A significant difference in pollen vitality was found among various varieties,Among the 68 varieties the pollens of Longiflorum Hybrids lily was highest;The pollens of tiger lily almost lose vitality.

结果表明：以蔗糖培养基培养法效果最好，并能直接观察到花粉管发育状况；百合不同品种间花粉生活力存在极显著差异，在所测定的68个品种中以麝香系百合的花粉活力为最高；卷丹花粉活力最低，几乎为零。

Pollen activity of trisomic 2,7,9 was lower than that of diploid significantly;Pollen activity of trisomic 7 was the lowest.

5.9号三体的花粉活力显著低于二倍体；2号、7号三体的花粉活力极显著低于二倍体；7号三体的花粉活力最低。

The nucleus vegetative in nature derived from unequal or equal division of the uninucleate pollen in rye anthers cultured in vitro develops into pollen embryoids or calli.The green haploid plantlets are differentiated successfully.

离体培养黑麦花药，单核花粉可以通过不等分裂和均等分裂由营养性质的核发育成花粉胚状体或愈伤组织，并且最后形成了单倍体植株。

Pollen grains are adapted according to the method of pollination, those carried by insects often being sticky or barbed, while wind-pollinated plants generally produce smooth light pollen.

花粉粒与授粉方式相适应，那些虫媒花，花粉通常是粘性的或有刺的，而具有风媒花的植物，其花粉通常光滑而轻。

Furthermore, our study can provide valuable references for the pollen-mediated gene flow in other self- and wind-pollination crops, such as wheat, for the pollen-mediated gene flow models of wind-pollination crops may follow the same principles.

特别是花粉介导的基因漂移模型的一般形式，在风媒传粉作物间应该是一致的。

Our study can provide valuable references for the pollen-mediated gene flow in other self- and wind-pollination crops, such as wheat, for the pollen-mediated gene flow models of wind-pollination crops may follow the same principles.

特别是花粉介导的基因漂移模型的一般形式，在风媒传粉作物间应该是一致的。

We are forbidden from giving money to these shoeless, skinny children, as this will perpetuate begging.

向光着脚，骨瘦如柴的孩子施舍是不可以的，因为要招来无休无止的乞讨。

It would be hard not to fall victim to some sharpeyed policeman.

要想不被某个目光锐利的警察抓到，谈何容易。