The exine is composed of tectum, columellae, foot layer and endexine.

花粉外壁由顶盖、状、底及外壁内所成。

Hay fever sufferers have a worse time when the pollen count is high.

花粉计数高时，枯草热患者的日子就更不好过了。

Hummingbirds have discovered that nectar and pollen are very nutritious.

蜂鸟发现花蜜和花粉是很有营养的。

The pollen of the weed is the main sensibiligen of hay fever in human.

豚草花粉是人类枯草热症的主要致敏源。

The big, empty and abortive pollen grains are observed at the stage of uninuclear microspore.

单核期的小孢子出现壁发育不良和巨大及空花粉现象。

The external factor like chemical agent, the cosmetics, the zootoxin, the fish and shrimp, the pollen, the dust, the solarization, scratch with the finger grasp and so on.

外因如化学制剂、化妆品、动物毒素、鱼虾、花粉、尘埃、日晒、搔抓等。

This paper summarizes the effects of metaxenia on fruit quality and fruit maturation period during the fruit production and the research status on action mechanism of metaxenia.

摘要综述果树生产中花粉直感对果实品质及果实成熟期的响，以及花粉直感作用机理的研究现状。

Both the filtrate and the dialyzate of agave pollen can activate the enzyme, thus proving that there was activating substance of the thiol group in agave pollen.

无论是剑麻花粉的滤液还是透析液,都能使剑麻蛋白酶激活,证实剑麻花粉中含有巯基激活物质。

Pollen disease is a kind of hypersensitiveness occurring on the sensitive individuals to the allergic pollen, and is the most representative disease of allergic diseases.

花粉症是敏感个体对花粉的一种超敏反应，在变态反应性疾病中最具代表性。

The reproductive isolation among sympatric Pedicularis species is influenced by the differences of pollinator behavior and floral form via ethological isolation and mechanical isolation.

另一方面是通过机械隔离机制，即由熊蜂不同的访花行为以及植物花部结构上的差异避免熊蜂携带的异种花粉接触。

The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉壁的外壁分为外和内，外包括覆盖、基粒棒和基足等三，内只包含一。

As a result, this paper presents the 3D reconstruction segmentation display, and analysis results of pollen spore, chaperonin, head, cervical vertabra, tibia and carpale.

实现了花粉孢子、分子伴侣、以及颅、颈椎、胫骨、腕骨的三维重建分析测量分割。

It indicated that the frequency of formation of the true pollen-derived plantletsw ere significantly low in the anther culture of B. napes.

这些结果说明在油菜的花药培养中可能有一少数花粉植株的形成。

But fed with oakery pollen,indices as above were 9. 59 days, 37. 17 days, 3. 89 days,and 0. 86 per day,respectively.

而用青杠花粉饲养，其发育历期长达9．59天，雌雄成螨寿命缩短为37．17天和3．87天，日平均产卵量仅0．86粒。

These results indicate that callose metabolism is active and very important not only in microsporogenesis but also in microgametogenesis in rice.

营养细胞的细胞质中继续积累胼胝质，花粉成熟对胼胝质在小孢子形成和发育过程中的功能进行了讨论。

The similarity of its heteropolar 3- or 6-aperturate pollen to the 3-aperturate pollen of Eudicots might result from convergent evolution.

其异极3沟或6沟型花粉真双子叶植物的3沟花粉的相似是趋同演化的结果。

Generative nuclei The two gametic nuclei formed by the division of the generative cell in the pollen tube of angiosperms.

在被子植物花粉管中的生殖细胞（应为雄原核译者注）分裂成两个配子的核。

(2) The pantoporate pollen of P. merrilliana shows that the species has vital taxonomical and evolutionary significance in Primula.

(2) 安徽羽叶报春的散孔型花粉显示其在报春花属中有重要的系统意义和进化意义。

The pollen morphology of 10 species of Scorzonera genus in the Mongolian Plateau was observed by scanning electronic microscope.

用扫描电子显微镜观察了蒙古高原鸦葱属植物10个种的花粉形态。

Pollen mother cells undergo meioses through simultaneous cytokinesis and give rise to tetrads of microspores, which are tetrahedrally arranged.

花粉母细胞行减数分裂，细胞质分裂属同时型，产生小孢子四分体，为四面体形。