花粉

Morphological and cytological observations showed that the pol CMS plants in DGCMS Yi 3A were complete male sterile, had no pollen sac differentiation and had smaller petals and stamens at higher temperature situation.

花器形态和花药发育的解剖学观察结果表明，DGCMS-宜 3A中表现波里马细胞质雄性不育的植株，其花器形态和花药发育的解剖学特点与 pol CMS相同，即在高温条件下，花瓣较小，表现彻底不育，无花粉囊的分化；在低温条件下，花瓣变大，表现部分雄性不育，可分化出 1～ 4个花粉囊，并产生一定数量可育花粉。

Morphological and anatomical observationsshowed that the pol CMS plants in DGCMS-Yi-3A were complete sterile and hadno pollen sac differention at higher temperature condition,and were partialsterile and had 1-3 pollen sacs in each anther at lower temperature condition.

花器形态和花药发育的解剖观察表明，DGCMS-宜3A中表现波里马细胞质雄性不育的植株在高温条件下表现为彻底雄性不育，无花粉囊的分化；在低温条件下，表现部分雄性不育，可分化出1-3个花粉囊，产生少量可育花粉。

Morphological and anatomical observations showed that the pol CMS plants in RGCMS?117A or RGCMS S45A were complete male sterile ,had no pollen sac differentiation and had smaller petals and stamens at higher temperature situation.

花器形态和花药发育的解剖学观察表明，RGCMS S45A和RGCMS 117A中表现波里马细胞质雄性不育的植株，其花器形态和花药发育的解剖学特点与polCMS相同，即在高温条件下，花瓣较小，表现彻底不育，无花粉囊的分化；在低温条件下，花瓣变大，表现部分雄性不育，可分化出 1～ 4个花粉囊，并产生一定数量可育花粉。

The results show that: Each anther has four pollen sac, anthers from the epidermis, medicine room wall, the middle, composed of the tapetum, Mature middle and all the disintegration of tapetum; is symmetrical tetrad type, pollen is a 2 - cell-type pollen; in anther culture lei check standards should be time for about 3-4mm.

研究结果表明：每个花药具备4个花粉囊，花药由表皮、药室内壁、中层、绒毡层组成，成熟后中层和绒毡层都解体；四分体属左右对称型，花粉属2-细胞型花粉粒；在进行花药培养时取蕾标准应为3-4mm左右。关键词：铃兰；花药；解剖

The RGCMSplants in RGCMS-117A or S45A were complete male sterile at the bothtemperature conditions,and there was no pollen sac differentiation at thehigher temperature condition and there were 1-3 pollen sacs in each anther atthe lower temperature condition,but the anther development was inhibited atthe stage of microspore.

表现核质不育的植株，在高温条件下表现彻底波里马细胞质雄性不育，无花粉囊分化；在低温条件下，也表现彻底雄性不育，具核、质不育的共同特点，每个花药可分化出1-3个花粉囊，但无可育花粉，其雄性败育时期和特点与S45A和117A相同。

Pollen germination along with pollen tube growth is an essential process for the reproduction of flowering plants.

花粉萌发即花粉沿着花粉管的生长过程，是开花植物繁殖的一个必要过程，这个过程是研究细胞生长和形态发生的一个理想模型。

The regulation of pollen germination and tube growth has also been a good model system for studying signal transduction mechanisms in higher plant cells.

花粉的体外萌发和花粉管的定向生长是受复杂的信号传递机制调控的，论文的最后一部分证实了cAMP在花粉管的萌发及生长过程中的作用。

It is important for preventing pollinosis from breaking out to analysize the quality and quantity of pollen in the air, and to investigate the distributional regulation.

对花粉进行定性定量分析，探究花粉的散布规律，可对花粉症的发生起到一定的预防作用。

Objective: to investigate the types, content, drift patterns and distribution features of airborne pollen and analyse their relationship with the pollinosis, guide the prevention and treatment of pollinosis.

目的：探明太原市中心地区夏秋季常见气传致敏花粉的种类、含量、花粉飘散规律及分布特点，分析其与花粉症的关系，指导该疾病的防治工作。

The results showed that the cell wall organization during anther development failed to divide into inner-wall, middle and tapetum normally, and not to provide material, energy and information transfer for the development of pollen mother cells, resulting in the occurrence of abnormal pollen mother cells separatist period; thus which could not form a normal pollen grains which led to abortion.

结果表明，不育花药壁组织在发育过程中，没有分化形成正常的内壁、中层及绒毡层，不能为花粉母细胞的发育提供物质、能量和信息的传递，造成花粉母细胞在减数分裂期发生异常，不能形成正常的四分体，因而未能形成正常的花粉粒而导致败育。

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