花粉

We discuss the floral design and floral display which are adapted to increase pollination of anemophily: at the period of blossom, when up the slope of a hill, the concentration of pollen decreases at first and then increases, and the concentration of pollen on horizontalhave no significant difference.

山核桃花部构成和开放式样对提高传粉效率有积极意义；散粉盛期，山核桃花粉浓度自山脚向山顶呈现出随高度的增加而减少，相同海拔高度花粉浓度不存在显著性差异。

The results showed that the pollen grains of wild Rosa rugosa were prolate or perprolate, and their equatarial view was long ellipse, long ellipse leaning toward rectangle or ellipse leaning toward spindle and the polar view was 3-labed-rounded, the two poles were plane or embowed. They all had 3-colposates which annularly distributed in equal space, and the pollens belonged to N3P4C5 model.

结果表明：野生玫瑰的花粉粒为长球形或超长球形，赤道面观长椭圆形、长椭圆形偏矩形或椭圆形偏纺锤形，极面观三裂圆形，两极平截形或圆弧形，具三孔沟，以等间距环状分布，属于N3P4C5型花粉。

It was found that the antioxidative and antiradical capacity of the amygdlin from almond pollen were weaker than that of ethanol extracts and supernatant after amygcllin crystallization, except hydroxyl radical scavenging capacity.

结果表明：杏花花粉中苦杏仁苷的抗氧化能力，除清除羟自由基以外均低于杏花花粉醇提物和苦杏仁苷结晶上清物。

Therefore, from the flowering length, the effect of the climatic conditions and take the morphological structure, flowering length to the pollen of energy, energy, the seed vigor of pollen influence on some physiological indexes of determination to proven buckeye rate, low birth rate, low reason for improving the buckeye setting out the theoretical basis and reproduction rate, in order to improve the buckeye breeding take measures to meet the demand of the market.

因此，从花期长短，气候条件的影响等方面以及花的形态结构，花期长短到花粉活力，不同条件对花粉活力、种子活力的影响等一些生理指标的测定来探明七叶树结实率低、繁殖率低的原因，为提高七叶树的结实率、繁殖率找出理论依据，以便对提高七叶树的繁殖采取具体措施，满足市场的需求。还有这个标题：七叶树的生长开花结实特性初步研究谢谢了

This paper briefly describes the progress in cytoplasm reorganization, dynamics of wall callose, starch granules and organelles in pollen grains, the tapetum development, specific genes, asymmetric division and cell fate determination in developing pollens. Some problems and future research directions are pointed out in this review.

本文针对花粉发育过程中的细胞质改组；胼胝质壁、淀粉粒和细胞器的动态变化；绒毡层的发育；花粉发育特异基因；以及不对称分裂和细胞命运等几个生物学问题的研究进展作了简要综述，最后还提出了一些研究展望。

This paper briefly describes the progress in cytoplasm reorganization, dynamics of wall callose, starch granules and organel les in pollen grains, the tapetum development, specific genes, asymmetric division and cell fate determination in developing pollens. Some problems and future research directions are pointed out in this review.

本文针对花粉发育过程中的细胞质改组；胼胝质壁、淀粉粒和细胞器的动态变化；绒毡层的发育；花粉发育特异基因；以及不对称分裂和细胞命运等几个生物学问题的研究进展作了简要综述，最后还提出了一些研究展望。

We studied reproductive traits of this species such as phenology of capitulum, ratio of pollen to ovule, self-compatibility, pollen viability, visiting insects and germination potential of seed by experimental observation and bagging treatment in order to assess the association of these reproductive traits with invasiveness.

通过实验观察和人工控制套袋等方法，对其花序开花动态、花粉胚珠比、自交亲和性、花粉活力、访花昆虫和种子的萌发率等与繁殖相关的特征进行了研究，探讨了这些繁殖特征与入侵性的关系。

Pulchella were tubulous, in which the ray ones were pink and sterile, while disk ones were white and fertile. The flowering duration of capitulum did not last for a long time.

腰毛鼠毛菊缘花和盘花的花粉败育率分别为2.58±0.67％和5.63±0.55％，琉苞菊盘花为4.56±1.67％，蝎尾菊缘花和盘花的花粉败育率分别为0.47±0.23％和0.44±0.35％。

Anther appendages membranous; pollinia 2 per pollinarium, waxy, pendulous, caudicle slender.

花药附属物膜质；花粉块2 每pollinarium，腊制，下垂，纤巧的花粉块柄。

Pollens of Polygonum convolvulus P. multiflorum P. cuspidatum were examined by transmission electron microscope and technique of ultrathin section. The results of thin section indicate pollens of P.

为此，本文以花粉壁的内部结构为重点，用透射电镜的薄切片技术，对广义蓼属蔓蓼组的4种植物花粉外壁构造的特点进行了观察和研究。

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。