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F1-ClipTipTM Multichannel Pipettes, 30 to 300μL

F2-ClipTip 多通道移液器30至300μL

Company: Thermo Fisher Scientific
Catalog#: 4661140N
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Quantification of the Composition Dynamics of a Maize Root-associated Simplified Bacterial Community and Evaluation of Its Biological Control Effect
Author:
Date:
2018-06-20
[Abstract]  Besides analyzing the composition and dynamics of microbial communities, plant microbiome research aims to understanding the mechanism of plant microbiota assembly and their biological functions. Here, we describe procedures to investigate the role of bacterial interspecies interactions in root microbiome assembly and the beneficial effects of the root microbiota on hosts by using a maize root-associated simplified seven-species (Stenotrophomonas maltophilia, Ochrobactrum pituitosum, Curtobacterium pusillum, Enterobacter cloacae, Chryseobacterium indologenes, Herbaspirillum frisingense and Pseudomonas putida) synthetic bacterial community described in our previous work. Surface-sterilized maize seeds were grown in a ... [摘要]  除了分析微生物群落的组成和动态外,植物微生物群落研究的目的在于了解植物微生物群落组装的机制及其生物学功能。在这里,我们描述了通过使用与玉米根相关的简化的七种物种(嗜麦芽窄食单胞菌(Stenotrophomonas maltophilia),)来研究细菌种间相互作用在根微生物群组装中的作用以及根菌群对宿主的有益影响的程序。 Ochrobactrum pituitosum ,Curtobacterium pusillum ,阴沟肠杆菌, Chryseobacterium indologenes ,<在我们以前的工作中描述过的假单胞菌(pseudomonas putida))合成细菌群落。表面灭菌的玉米种子在含有多种细菌的悬浮液中浸泡后,在基于双管生长室的非生物体系中生长。通过对7种菌株中的每种菌株选择性培养基的培养依赖性方法追踪定殖在玉米根部的细菌群组成的动态。通过监测社区结构的变化来评估细菌相互作用对社区组装的影响。通过量化(1)真菌植物病原体,种子表面上的fusarium="" verticillioides和(2)幼苗枯萎的严重程度来评估简化的7种群落的植物保护效果真菌引起的疾病,在细菌群落的存在和不存在的情况下。我们的方案将作为研究实验室条件下植物="" -=""> ...

Determination of the Developmental Origin of Seeds Containing Endosperm Using Flow Cytometric Analysis
Author:
Date:
2015-06-05
[Abstract]  Seeds derived from a diploid, sexual plant typically contain a 2n embryo (n+n) and 3n endosperm, a ratio characteristic for most flowering plants. However, this ratio is altered in apomictic species, which reproduce asexually through seeds (Koltunow and Grossniklaus, 2003). Apomixis is usually a facultative trait and encompasses several developmental steps: (1) apomeiosis (avoidance of meiosis), (2) parthenogenesis (embryo development without fertilization), and (3) functional endosperm formation (autonomous without fertilization or pseudogamous requiring fertilization). If all three steps occur, this process results in maternal offspring (2n+0), which is genetically identical to the mother plant (clonal). Moreover, sexual and apomictic pathways can occur in the same plant and sometimes ... [摘要]  源自二倍体,有性植物的种子通常含有2n胚胎(n + n)和3n胚乳,这是大多数开花植物的比率特征。然而,这种比例在无性生殖物种中改变,其通过种子无性繁殖(Koltunow和Grossniklaus,2003)。单性生殖通常是兼性性状,包括几个发育步骤:(1)蚜虫病(避免减数分裂),(2)孤雌生殖(没有受精的胚发育)和(3)功能性胚乳形成(无需受精的自主性或需要受精的假性乳房)。如果发生所有三个步骤,该过程导致母体后代(2n + 0),其与母本植物(克隆)在遗传上相同。此外,性和无融合途径可以在同一植物中发生,并且有时它们交叉,产生多倍体倍生(n + 0;由减数分裂和孤雌生殖产生)或BIII杂种(2n + n;由蚜虫和受精产生)(Rutishauser,1947 )。可以在流式细胞计数种子筛选(FCSS)中测定不同类型的后代,其中染色的核的相对染色质含量通过测量它们的荧光强度来确定。这允许将胚乳的倍性与胚胎的倍性进行比较,并且因此推断形成种子的途径(Matzk等人,2000)。这种方法特别用于表征无形生殖植物中的种子或有性生殖的繁殖突变体的发育起源。
这里,我们提出了在十字花科中的FCSS的方案,植物的 Boechera 。然而,原则上,该方案可以应用于产生含有胚乳的种子的任何物种。

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