花粉

The development of Peiai 64S and IR36 did not differ up to microsporocyte formation stage; but since meiosis stage, male reproductive cells of Peiai 64S underwent several structural changes and ultimately terminated by early bicellular stage.

结果表明，小孢子母细胞减数分裂之前，培矮64S与IR36的发育过程基本相似。但从减数分裂开始，培矮64S的雄性性细胞出现一些异常变化，并最终发育至二胞花粉早期败育。

The aberrant phenotypes were observed in the anther of tobaccotransformed with ZM401 sense construct: the inflorescence growth and floral axiselongation are suppressed; the flower buds falling or flowers abscission earlier wereobserved. The degradation of tapetum are not observed at the binucleate pollen stagewhich corresponds to the mature stage, although the tapetal cells of untransformedtobacco anther at the same stage have already degenerated completely anddisappeared.

对转基因烟草进行形态学、组织学分析结果表明，ZM401基因以反向方式整合的转基因烟草表现一切正常，而含有ZM401正义基因的转基因烟草在表型和组织学上都出现了异常：花序生长缓慢，花序轴变短，生长过程中花逐渐脱落，花序轴褐化枯死；花药绒毡层退化延迟，药室内壁在雄配子体发育后期不能进行带状加厚，阻碍了花粉粒的释放。

Research progresses have been performed during the past decade in the following aspects: ecologicaldatabase development, climate and its variability, ecophysiological response of plants to environments,vegetation and landscape changes, biodiversity patterns and their changes, plant functional types and traitswith relation to climatic gradient, productivity and carbon dynamics, pollen-vegetation relationship, tracegas emissions, land use and land cover changes, as well as biogeographical and biogeochemical modelling.

在过去的10年里，中国东北样带的研究进展表现在以下几个方面：生态数据库发展、气候及其变异性、植物对环境的生态生理响应、植被和景观变化、生物多样性格局及其变化、植物功能型和植物性状及气候梯度分析、生产力和碳动态、花粉-植被相互关系、痕量气体放散、土地利用和土地覆盖变化以及生物地理和生物地球化学模拟。

Thus the early biparental inheritance might be caused by occational male plastid transmission.

本研究在菜豆不同品种成熟花粉的生殖细胞中都没检测到细胞器DNA，表明父系可遗传的细胞器的排除在不同品种间是一致的，即不存在基因型的影响，我们认为菜豆的早期遗传分析得出的双亲遗传的结论可能是由于雄性质体的偶尔传递。

Any of various brightly colored Australasian parrots having a to ngue with a brushlike tip that is used to feed on nectar and pollen.

吸蜜小鹦鹉一种澳大拉西亚的色彩艳丽的鹦鹉，具有刷子一样尖端的舌头，用于食花蜜和花粉

Any of various brightly colored Australasian parrots having a tongue with a brushlike tip that is used to feed on nectar and pollen.

吸蜜小鹦鹉一种澳大拉西亚的色彩艳丽的鹦鹉，具有刷子一样尖端的舌头，用于食花蜜和花粉

Any of various brightly colored Australasian parrot s having a tongue with a brushlike tip that is used to feed on nectar and pollen.

吸蜜小鹦鹉一种澳大拉西亚的色彩艳丽的鹦鹉，具有刷子一样尖端的舌头，用于食花蜜和花粉

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。

Using cytohischemical staining methods, with the results of comparison the dynamics of proteins and polysaccharides in the anthe wall cells and colule cells of different developmental phases in female and male flowers, the anormogenesis of anther tapetum in the inflecting phase of from bisexual flower to unisexual flower was observed. In microspore developed phase, the tapetum functions of preserving and transportingmutritive material for microspore development and of secreting callosal enzyme for decompositing callosal cell lost no normal guadrant formed, of being abnormal meiose of pollen mother cells, and then, the stamen aborted selectively in female flowers and pistil in male flower.

利用细胞组织化学染色技术，对雌、雄花雄蕊花药壁细胞及花药内细胞发育过程中多糖及蛋白质动态进行了比较，实验中观察到雌花在从两性至单性花转变时期雄蕊绒毡层在整个发育过程中表现异常，在小孢子发育过程中未能起到贮藏、转运营养物质供小孢子发育及适时分泌胼胝质酶溶解胼胝质壁的功能，并且花粉母细胞减数分裂异常而未形成四分体结构，进而导致雌花雄蕊选择性败育，而雄花中雌蕊组织也发生了选择性败育过程。

Study on the pollen morphology of Calycanthus L.

Title 夏蜡梅属花粉形态的研究。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了