繁殖体

To establish a new technique for in vitro rapid propagation and conservation of germplasm of autotetraploid plant of Plalycodon grandiflorum, basal MS medium supplemented with different hormones was filtrated and optimized by using uniform design and orthogonal design.

为了建立优良同源四倍体桔梗的快速繁殖和离体保存技术，采用均匀设计和正交设计以添加不同激素的MS培养基为基本培养基进行筛选和优化。

RESULTS Hp can grow in liquid media in room temperature, and 3 out of 18 strains of coccoid Hp reverted to bacterial.

结果 Hp可在室温液体中繁殖，18株中观察到3株球形体Hp在室温下的返祖，除常见球形变外的Hp杆状弯曲、长杆状、短杆状、长丝体、巨球体、丝球体、原生质体及细小"S"和弧形变异。

Its main features are: algae body as a single cell or even into a variety of groups; cell walls composed of silica and pectin, but also by the structure of the shell and the shell under the combined set of the Cheng, vertical section view was "soap-box"-shaped; in the upper and lower shell surface of the shell are patterns arranged in patterns on both sides of the main mode of symmetry and radial symmetry is divided into two categories, for the classification of the most important basis; be able to campaign Type in the shell has a shell side seam, can not be changed no shell seam types; pigment body sheet or ribbon, 1 or 2, or for multiple small discoid, yellow green or brown, containing chlorophyll a, c, also contains fucoxanthin and silicon A flavin and other photosynthetic pigments; storage material mainly for oil droplets; reproduction mainly for cell division and cell division in diatoms obvious features are: each cell division, resulting from two sub-cells,, only one and the mother cell and so big, the other one is smaller.

其主要特征是：藻体为单细胞或连成各式群体；细胞壁由硅质和果胶质组成，而且在结构上都是由上壳和下壳套合而成，纵断面观呈"肥皂盒"形；在上下壳的壳面上有花纹，花纹排列的方式主要分为两侧对称和辐射对称两大类，为分类上的最重要依据；能运动的种类在壳面都有壳缝，不能动的种类均无壳缝；色素体片状或带状，1个或2个，或为多个小盘状，黄绿色或黄褐色，含叶绿素a、c，还含有墨角藻黄素和硅甲黄素等光合色素；贮藏物质主要为油滴；繁殖方式主要为细胞分裂，硅藻的细胞分裂的明显特点是：每次细胞分裂所产生的2个子细胞中，仅有1个和母细胞等大，另1个则稍小。

Up to now,over 20 seedlings of Chinese Jujube have successfully been cultivated in vitro.

到目前为止，已有20多个枣品种以不同类型的外植体建立了无菌离体繁殖体系。

The spores of Neocheiropteris palmatopedate were cultured in improved Knop's medium, in-situ humus soil and red soil respectively. Spore germination and gametophyte development were observed under optical microscope and dissecting microscope, and the impact of four culture methods on the gametophyte development and sexual reproduction was compared. On these experiments, its cause of endangerment was analyzed.

采用改良Knop's固体培养基、原生境腐殖质土和红壤分别培养扇蕨孢子，光学显微镜及解剖镜下观察记录其于包子萌发及配子体发育过程，比较了3种培养方法对其配子体发育和有性繁殖的影响，并在此基础上探讨了扇蕨的濒危原因。

Therefore, the appearance of macroscopic algae not only improved the environment and played an essential support for the growth and propagation of the metazoan which depended on oxygen, but also provided a new food source that served as a new basis in the ecosystem for metazoans evolution and development.

因此，陡山沱期的宏体植物不仅改善了环境，为依赖一定氧而生活、生长和繁殖的后生动物给予了必要的支持，而且作为生态系统中的必要基础，为宏体后生动物的快速发展和演化提供了一个新的食物源。

Joint friction and micromotion should inevitably form the biofilm and debris around the prosthesis, which will provide a breeding ground for the propagation of pathogenic microorganisms. On the contrary, the destruction of bone around the joint caused by infection is one of the reasons of joint sinking.

在一定条件下，术后关节感染与假体松动又是相互促进的，关节的摩擦和微动，必然会在假体周围形成界膜和微粒，这就为病原微生物的繁殖提供了条件；反之，关节周围的感染所造成的骨破坏，也是关节松动下沉的一个原因。

According to the root type division the Chinese Dwarf cherry belongs to the inductive type of root primitive body,From above several aspects we can see that the mechanism of soft-wood cutting is : Under the condition of without root primordium ,the root primordium appear from cambium by using rooting accelerator under the condition of well temperature ,humidity ,and light, then the root primordium breaks through the cerebral cortex, finally extends to outside .

从以上几个方面我们可以看出，欧李嫩枝扦插生根繁殖的机理为：欧李嫩枝在无根原体存在的情况下，经过生根剂的处理在合理的温度、湿度及光照条件下，由其形成层部位产生根原体，随后根原体突破皮层，伸向外部。

To find out the optimal method to preserve good quality of mother plant with confused genetic backgrounds and to produce seedings of Senecio hybridus effectively and rapidly,in vitro culture and high frequency propagation of Senecio hybridus was studied by means of using stem-segment with single bud as explants.

为探索瓜叶菊杂合体母株优良性状的保存方法，以便快速有效地进行瓜叶菊种苗的生产，以瓜叶菊5个不同花色母株的单芽茎段为外植体进行了离体培养与快速繁殖研究。

The apical buds of Celosia cristata were used as the explants for the rapid propagation to compare the mutagenic effects treated with colchicines at different concentrations and time duration in tissue culture.

以鸡冠花顶芽为外植体，研究其离体快繁程序并在无菌体繁殖条件下探索了秋水仙素溶液不同浓度和时间处理对鸡冠花的诱变效应。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。