查询词典 pollens

Self-pollination was brought as the essential reason for causing emptied seeds by former researchers. Based on those studies, potassium antimonate and electron microscopy were used to study the calcium distribution of pollens in the micropylar canal of self-pollinated and cross-pollinated ovules and morphological changes in certain cells undergoing programmed cell death from pollination to fertilization, and observation of histo-chemical changes during microgametopyte development was performed by paraffin section.

前人研究认为自交是华北落叶松产生空粒的主要原因，本论文在此基础，运用焦锑酸钾沉淀法配合电镜观察研究了传粉后到受精前异交控制和自交辅助授粉胚珠珠孔道内花粉的钙分布情况，及此过程中细胞程序化死亡超微结构的变化，并通过石蜡切片研究了华北落叶松传粉后到受精前雌配子体发育过程及细胞内含物的变化，以研究在受精前胚珠内是否存在花粉识别与选择系统，探讨钙信号传导和花粉与胚珠相互作用及细胞程序化死亡的关系。

It is the first time that these phenomena were observed: Two nuclei are surrounded by plasma and locate at the central of the female gametophyte and the others nuclei are positioned at the fringe of the female gametophyte; Before the pollen tube enters the female gametophyte. the nuclei in chalazal end begin splitting of plasma and form multinuclear cell.4. The pollens of Gnetumc are spherical or applanate with single aperture. The ornamentation of exine is spine. The basis part of spine is lenience and the top part of spine is tip or obtuse sphere.

首次在买麻藤属植物的雌配子体中观察到2个游离核位于配子体的中央位置，且被一团原生质所包围的，其余的游离核位于边缘的现象以及花粉管进入雌配子体前，合点端的核已经发生胞质分裂形成多核细胞的现象 4、买麻藤的花粉近球形或扁平型，有单萌发孔，外壁表面具小刺状纹饰，小刺基部宽大，末端尖或钝圆。

Doubled pollens grains and calli may be formed in this way and non-haploid plants may be produced.

通过这些方式，可以形成加倍的花粉粒和愈伤组织，由此可产生自然加倍的二倍体植株。

The problem of taxonomy of every species were carried out research combining with the histological structure, morphology of pollens and the characteristic of embryology; while the relation betweeen Cycadaceae and Stangeriaceae and Zamiaceae were analysed.

结合解剖结构、花粉形态、胚胎学特征等方面的许多性状，对各个种的分类学问题进行了细致的研究；同时对与托叶铁科和泽米铁科的关系等方面也进行了一些分析。

Cultureof the pollens of three apple varitieties on a medium amended with15%sucrose and 1%agar showed that germing abilities of Fuji,Gala and Telemon were72%,77%,82%,respectively.

本文以嘎拉，富士，telemon为试材，采用不同培养基来测定花粉的发芽率，以便了解苹果花粉发芽所需要的适宜的培养基。

When staining with iodic solution, most of the pollens showed sterility, which was in consistence with the low setting percentage of the mutant plant.

碘液染色检查发现绝大多数花粉不育，并与该突变株的低结实率一致。

This paper reports on our observation that progenies derived from rice plants pollinated by pollens of Oenothera biennis exhibited distinct variations in numerous morphological and developmental traits.

本文报道通过水稻（品种通育211）与柳叶菜科植物—-月见草进行远缘杂交，其后代出现了大量、明显的性状变异。

The samples of free amino acids were prepared from bee-collected pollens of codo-nopsis pilosula, brassica campestris, typha angustifilia and papaver, through extraction with ethanol-water solution and further purified by ion-exchange chromatographic columns.

本文以党参、油菜、水烛及罂粟等4种植物的蜂集花粉进行醇—水提取，经离子交换柱后得到游离氨基酸样品，提取后的花粉残渣以6ml/l盐酸封管水解制得结合氨基酸样品。

The analysis shows that under heat stress, meiocytes degenerate while tetrad cell dispersion fails at microspore formation phase. During pollen maturation phase, loss of orientation of reproductive cells, abnormal vacuolization of tapetal cells, paramorphia or abortion of anther walls and pollens are observed under heat stress.

结果表明，受高温胁迫后，在小孢子形成阶段，水稻花粉母细胞发育异常、四分体无法适时分散；在花粉粒成熟阶段，水稻生殖细胞失去正确的排列方向、绒毡层细胞发生非正常分解、花药壁和花粉粒发生形态异常并出现败育。

The effects of different culture media, preservation condition and time on the germination of pollens collected from 30~40 years old Platanus acerifolia tree were studied.

本论文以30~40年生悬铃木的花粉为试材，研究了不同培养基对其萌发的作用，同时探讨了不同贮藏条件和贮藏时间对花粉生活力的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。