查询词典 meristem

Macrocystis and Nereocystis and is distinguished by its heteromorphic ALTERNATION OF GENERATIONS in which a large sporophyte alternates with a microscopic gametophyte, and in which growth takes place in a special meristem region on the surface of the thallus.

在这类植物的生活史中，孢子体比配子体小。配子体是由叶状体表面特殊的分生组织区发育而来的。

In the course of the differentiation and development, some new characters of morphogenesis were found, and the mechanism of early development of rudimentary panicle were understood further, with which recent progress made in angiosperm shoot apical meristem structure and function were discussed.

同时，在研究过程中还发现了一些与前人所不同的形态发生特征，并初步探讨了水稻幼穗早期的起源及分化发育的机理。

LFY-like genes play important role in plant development, when they were first isolated from mutants of Antirrhinum and Arabidopsis, they were thought to be "SAM-specific-determinating-genes", regulating the transition from inflorescence to flower meristem. However, further research revealed that LFY-like

LFY类基因在植物形态建成过程中具有重要作用，根据其突变体的特征，曾一度被认为是在花分生组织和花序分生组织中特异表达的"分生组织特征决定基因"，控制花序分生组织向花分生组织的转变。

Maintenance of stem cell number in shoot apical meristem is essential for the generation of later organs.

植物顶端分生组织中干细胞数量的维持对于侧生器官的发生至关重要。

Studies on tip meristem culture rapid propagation and induction of in vitro stolon of manyflower betony stachys floridana schuttl .

臭柏不定根所获取的资源在匍匐茎中能实现向顶性的和向基性的共享。

Three major embryonic tissue systems,shoot apical meristem,root apical meristem,and the differentiation of procambial strands,were visible in torpedo-stage somatic embryo.

三种主要的胚性组织系统包括芽顶端分生组织，根顶端分生组织和原形成层束在鱼雷形胚阶段清晰可见。

The promeristem is consisted of three groups of initial cells, which have typical cytological characteristics of meristem cells. The primary meristem is composed of calyptrogens, primordial epidermises, periblems and pleromes. Both the calyptrogens and the primordial epidermises initiate from the same layer of initial cells.

原分生组织由3群原始细胞组成，其细胞具有典型分生组织的细胞学特征；初生分生组织包括根冠原、表皮原、皮层原和中柱原，其中根冠原和表皮原具有相同的起源。

The embryo consists of a hypocotyls-root axis, with a rootcap and apical meristem at one end and an apical meristem and several cotyledons, or seed leaves, at the other.

胚胎有胚桥-根轴，藉由 rootcap 和顶上的分裂组织在一端和一个顶上的分裂组织和一些子叶或种子树叶，在另一个。

Can improve the survival ratio of seeding. Culturing in hormone media can make meristem tip survive once time, and the result is better than two-time-cultivation.3、The meristem tip with two phyllomes(0.3-0.4mm in size)were found to suitable for virus-free seeding culture that were cut from aseptic seeding, which led to higher survival and virus-free ratio, up to 72.1%and 54.2%.

在培养基中添加椰汁、香蕉汁等有机添加物可以明显提高成苗率。3、采用二次剥离茎尖的方法，从无菌试管苗上切取带2个叶原基(大小0.3-0.4mm)茎尖分生组织培养，成苗率为72.1%，脱毒率为54.2%。

Somatic embryos can be produced both from the surface and the inner of the calli. Embryogenic cell has normal shape, dense cytoplasm , clear nucleolus, hearty metabolize; Plantlet regenerations were developed from global embryo, heart-shaped embryo, torpedo-shaped embryo and cotyledon embryo, in which the V-shaped vessel vascular bundles and shoot tip meristem and root tip meristem were observed.

胚性细胞多为椭圆形，细胞质浓厚，核仁明显，代谢旺盛；体细胞胚经过球形胚、心形胚、鱼雷形胚和子叶胚而发育成再生植株，子叶期体细胞胚可观察到明显的V型维管束、茎尖分生组织以及根尖分生组织。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐