叶原基

叶原基首先进行切向分裂，然后进行各个方向的分裂形成幼叶。

The leaf primordium divides tangentially , then divides in various directions , and forms a young leaf .

它们起源于苗端倒数第二叶原基近轴面，由原表皮细胞发育而来。

The hairs originated from the protoderm cells on the adaxial surface of the second leaf primordium from the shoot apex .

在双目实体显微镜下，分别切取含有生长锥及1、2、3和4个叶原基的茎尖分生组织嫁接到黄化砧木上，以获得茎尖微芽嫁接苗，用PCR进行黄龙病分子检测。

With the binoculars and stereoscopic microscope , the meristem of shoot-tips containing growing cone and 1,2,3 or 4 leaf primordia separately were grafted on etiolated rootstocks to obtain shoot-tip grafted plantlets . And the pathogen of Citrus Yellow Shoot was determined by PCR technique .

PLA1在发育中的叶原基、花序苞叶和伸长的节间表达，但在地上部顶端分生组织不表达。

PLA1 is expressed in developing leaf primordia , bracts of the panicle , and elongating internodes , but not in the shoot apical meristem .

PLA1的表达模式和突变表型表明PLA1在发育中的叶原基中行使功能，影响叶片起始发育的时间以及营养生长的终止。

The expression pattern and mutant phenotype suggest that the PLA1 gene acting in developing leaf primordia affects the timing of successive leaf initiation and the termination of vegetative growth .

它有叶原基和一个苗端。

It has leaf primordia and a shoot apex .

叶轴也来自叶原基和在中央区保留的原形成层细胞。

The leaf axis arises from the leaf buttress and maintains procambial continuity in the central region .

芽原基形成时有淀粉积累，但在它近表层及两侧叶原基发生的地方，淀粉粒却很少或不存在。

Dur - ing the shoot primordium formed , a positive correlation between the starch accumulation and primordium formation could be obtained .

在球形胚发育后期，随着球形胚内部两侧细胞分裂加快，形成两个子叶原基并逐渐形成两片子叶。

In the later development , the globular embryo with two internal sides of cell division speeding up , formed the two cotyledons .

观察到球形胚和胚柄结构，成熟胚状体为圆筒状，芽分生组织为叶原基包裹。

The globular embryoids and the suspensor structure were observed . The mature somatic embryoid was wrapped by leaf primordium and was cylinder shaped .

在原肠期，胚区前端的外胚层细胞增殖形成视叶原基。

The results showed : At gastrula stage , the cells in front of the embryonic area gradually cleave to form optic disc rudiment .

而生殖顶端只由一般分生组织和基本组织构成。原形成层在顶端分生组织之下叶原基起源的地方发生。

The procambium continuously develop to the apex after it arises from the place where the leaf primordia originates from below the apical meristem .

芝麻茎尖有2层原套细胞，叶原基起源于原套的第二层。

There are two Layers of cells in the tunica of the shoot apex of Sesa-mum indium and the second layer of cell of tunica .

为了探讨悬铃木冬芽休眠的机理，研究了悬铃木冬芽休眠过程中芽鳞及叶原基的内源激素变化与休眠的关系。

The relationship between dormancy and endogenous hormone inside buds scales and leaf primordium was studied in order to explore the mechanism of winter buds'dormancy in Platanus acerifolia .

叶原基数由基因型和环境条件共同决定，而苞叶原基、小穗原基和小花原基数以环境因子的影响为主。

The number of leaf primordia was affected by both genotype and environment , while the numbers of bracteal , spikelet and floret primordia were affected mainly by environmental factors .

早期叶片发育包括三个主要过程：叶原基的起始，叶片腹背性的建立和叶片的延展。

Early leaf development is artificially divided into three main stages : the initiation of leaf primordium , the establishment of leaf adaxial-abaxial polarity , and the expansion of leaf blade .

弱光主要影响叶原基阶段气孔的分化形成，且使气孔密度和长度相应发生变化。

The effect of weak light affected the differentiation of stomata at the stage of expansion of leaf blades from leaf primordium . Thus seriously affected the development of stomatal density and length .

实验结果表明，（1）切取的茎尖当直径在0.3-0.6mm之间，并带有2-4个叶原基时成活率较高。

The results showed that ,( 1 ) When the size of the Stem-apex is between 0.3 mm and 0.6 mm and carry 2-4 leaf primordiums , the survival rate of Stem-apex is higher .

冬芽能否萌发取决于芽鳞的阻碍作用力与叶原基、生长点或花原基萌发力的平衡状态；

The sprouting capacity of the winter buds was determined by the force balance between the oppressing force of the bud scale and the sprouting forces from the phyllome , growth point or flower primordia .

由此可见，淀粉物质的积累和变化与叶原基的分化形成及白菜包心结球有着密切的关系。

That is to say , floral transition is accompanied . Hence the conclusion is that there exists a close relationship between the starch material accumulation and the formation of leaf primordia and leaf ball .

本文系统地模拟了小麦植株茎顶端不同类型原基的发育过程，建立了叶原基分化、小穗原基分化和小花原基分化、退化、败育、受精结实及籽粒生长的子模型。

The development processes of different shoot apex primordia in wheat plant were simulated systematically and comprehensively , including leaf primordium initiation , spikelet primordium initiation , and floret primordium initiation , degeneration , infertility , fertilization and kernel growth .

在植物的营养生长阶段，叶原基从植物地上部分顶端分生组织的周边区形成，在一系列细胞分裂和分化程序的指导下，最终发育成叶。

In the plant vegetative growth , leaf primordia arise from groups of initial cells within the peripheral zone of the shoot apical meristem . Leaf develops by following a series of cell division and differentiation programs to form its final shape and size .

近年来，通过遗传学和分子生物学研究已经鉴定和克隆了一批参与叶发育调控的关键基因，植物激素在叶原基的诱导和叶形态建成中也起十分重要的作用。

Recent genetic and molecular studies have led to the identification of a number of genes that regulate leaf development , and have also revealed that plant hormones play important roles in leaf primordium induction and leaf patterning .

其上的两片真叶叠套在一起，生长锥一侧长出叶原基和一些小突起。

The two euphylla on it cover together and come into euphylla and some little protuberances on one side of growth cone .

利用薄切片法对油樟茎叶油细胞和粘液细胞发育的研究结果表明：油细胞最早发生于第二叶原基以及茎端皮层和髓的基本分生组织中。

The development of oil and mucilage cells in the stem and leaf of Cinnamomum longepaniculatum were studied with the help of method of semithin section .