您要查找的是不是：
- tobacco somaclonal variation 烟草无性系变异
- The somaclonal variation of regeneration plant derived from mature embryo of perennial ryegrass (Lolium perenne L. were analyzed with RAPD makers. 摘要以多年生黑麦草成熟胚诱导获得的再生植株为材料，利用RAPD标记方法对其体细胞变异进行了研究。
- In the first part of this study, we addressed the issue of somaclonal variation in rice cv. 本论文由两部分组成。第一部分研究了水稻中体细胞克隆的多样性。
- Useful results have been obtained in the selection of useful somaclonal variation and germplasm conservation by konjac tissue culture. 利用组织培养进行有用突变体的筛选和种质资源的保存也取得了一些有价值的结果。
- Somaclonal variation a form of gene and chromosome instability that results from the tissue and embryo culture technique used in making GM plants [3]. 体细胞无性系变异即是指用于制造转基因作物的组织与胚胎培养技术造成的基因和染色体不稳定的一种形式。
- Somaclonal variation occurs in tissue and embryo culture even without genetic modification, but genetic modification often makes it worse. 体细胞无性系变异发生在组织和胚胎的培养，即使没有基因改造，但基因改造往往使情况变得更糟。
- The AFLP primer pairs become useful tools for selecting the lowest somaclonal variation from the regenerated shoots of A. formosanus under the tissue culture program. 这些具有侦测力的AFLP引物组，将是筛选台湾金线连组织培养之最低体细胞变异分生苗的有利工具。
- Techniques, influencing factors, advantages, disadvantages and advances in improvement of disease resistance using in vitro selection and somaclonal variation were summarized. 本文综述了体外选择与体细胞无性系变异进行抗病育种的方法、影响因素、优缺点及研究进展等。
- To test whether DNA methylation plays a role in somaclonal variation, the calli were treated with 5-azacytidine that reduces cytosine methylation by blocking activity of DNA methyltransferase. 为了检测DNA甲基化在体细胞克隆多样性中的作用，愈伤组织用5-氮胞苷进行处理，5-氮胞苷通过抑制DNA甲基转移酶的活性降低胞嘧啶的甲基化水平。
- Different opinions about the origination of somaclonal variation, which is a very common phenomenon in plant tissue culture, exist, such as the activation of transposable elements and DNA methylation. 植物体细胞无性系变异是植物组织培养中的普遍现象，关于这些变异的起源存在多种观点，如转座因子的活化、DNA甲基化等。
- A review about the progress achieved in this field since 1981 is presented in this paper.The genesis of somaclonal variation is discussed at both cytological level and molecular biological level. 本文综述了植物体细胞无性系的研究进展，从细胞学和分子生物学两个层次对无性系变异的起源进行了讨论。
- Somaclonal variations and its application is dealt with. 本文阐述了体细胞无性系变异及其应用。
- Pollen as the target for gene transfer is a potential plant transformation system which can avoid the problens of somaclonal variation and chimaera resulting from in vitro regeneration. 以花粉作为外源DNA的媒介，获得转基因植株是有潜力的遗传转化体系。它可避免离体培养过程中的遗传变异和转基因植株的嵌合现象。
- Recently,somaclonal variation in tissue culture of intergenric hybrids has been as an important biotechnology or genetic engineering to transfer the desirable alien genes into cultivated crops. 近年来，属间杂种在组织培养中的体细胞变异，已成为向栽培作物转移外源期望基因的一项重要的生物技术或遗传工程。
- Somaclonal variation has been patented in some crops as a means of producing genetic variability for selection, and it was assumed that the crops were genetically stable once established. 体细胞无性系变异已获得一些作物专利，并以此作为一种手段来产生可供选择的遗传变异，且假定该作物一旦移植生长，它的基因稳定。
- Somaclonal variation of tobacco and variant screening on mosaic virus resistance 烟草体细胞无性系变异及突变体抗病性筛选
- Somaclonal variation of rice soma 水稻体细胞无性系变异的研究
- The air was reeking with the smell of tobacco. 空气中弥漫着烟草的气味。
- The roles of somatic meiosis-like reduction in the somatic embryogenesis and somaclonal variations were discussed. 经体细胞类减数分裂产生的细胞都发生染色体重组。
- He tamped down the tobacco in his pipe. 他把烟丝紧紧摁实在烟斗里。
