致病

Most of the conducted populations were more pathogenic to plantain, plantain banana and Huangdi banana than to Anthurium rzerianum.

供试的观赏植物种群多数对大蕉、粉蕉和皇帝蕉的致病力要高于对观赏植物红掌的致病力。

Xanthomonas campestris pv. campestris is a gram-negative bacterium which can cause black rot on cruciferous plants around the world. One of the products of X.campestris is excellular polysacchride named xanthan gum.

野油菜黄单胞菌野菜致病变种是一种能在世界范围内引起十字花科植物致病的革兰氏阴性细菌，其显著特征是能产生胞外多糖。

Those not causing disease are not pathogenic factors, but they are causa morbi if causing disease.

未导致疾病的致病因素不是病因，已经引起疾病的致病因素是病因。

The 2b protein encoded by Cucumber mosaic virus plays an important pathogenicity role in many solanaceous hosts, but mechanism of inducing disease is still unknown.

黄瓜花叶病毒(Cucumber mosaic virus，CMV)2b蛋白作为重要致病因子的角色在茄科模式植物上已为广泛描述，但其致病机理尚未廓清。

Through a great number of field investigations and inoculation identifications, six corn varieties( Denghail, Jidan209, Dan639, Nongda3138, Benyu9) and two corn inbred-lines( Mo 17 and Huangzao4 ) widely popularized and used in Jilin province corn production and corn breeding now were defined as ideal differential hosts for pathogens of Sporisorium reilianum .They represented different resistant and susceptible level of corn to Sporisorium reilianum and were able to group the pathogen collections of Sporisorium reilianum from different corn-grown areas in Jilin.

经过大量的田间调查及人工接种鉴定，确定了登海1、吉单209、吉单180、丹639、农大3138、本育九、Mol 7和黄早四为较理想的玉米丝黑穗病鉴别寄主，初步建立了吉林省玉米丝黑穗菌致病性分化的鉴别寄主体系，该鉴别体系中的6个玉米品种及2个玉米自交系代表了吉林省正在推广使用的玉米品种资源和二大骨干自交系，对今后鉴定和监测病菌致病类型的分化具有重要作用。

Objective To study the possible existence of a new susceptible gene locus in myotonic dystrophy and its possible location.

目的研究强直性肌营养不良症是否存在致病新位点及可能的致病新位点的位置。

NY1 was also strongly pathogenic to the weeds C. virgata and Digitaria sanguinalis but had light or no pathogenicity to most crops.

菌株NY1对马唐和虎尾草也有很强致病性，但对于大多数供试栽培植物致病性很弱或无致病性。

Systematic infection of mice is used as a model to test the virulence of several mutants. According with their ability to form hyphae, nonfilamentous mutant is avirulent, and hyphae defective mutants have decreased virulence.

用系统感染小鼠模型分析这些突变株的致病能力，同它们形成菌丝的能力相一致，野生菌的致病能力最强，形成菌丝弱的突变株致病能力也减弱，不能形成菌丝的cph1 efg1突变株和crk1则无毒性。

The results indicate that the presence of GSH increased the expression of exoY、exoS、phzA1 and gacA,while no difference was observed with others virulence factor genes tested.PAO1 produced markedly less pyocyanin than the wild type strain PAOIP＜0.01Treating with GSH, the PCN production of PAOI(△gshB was increased from 0.47μg/mL to 1.73μg/mL (P＜0.01),the PCN production of PAO1 increased from 1.3μg/mL to 1.9μg/mL(P＜0.05),this result indicates that GSH upregulates PCN production.

结果发现，GSH对启动子库中exoS、exoY、phzA1和gacA等致病性因子的表达有促进作用，对其余测试过的致病性因子则没有明显影响；铜绿假单胞菌分泌的重要致病因子绿脓菌素(pyocyanin，PCN)的含量，在PAO1中远低于PAO1P＜0.01加入GSH后，PCN平均含量在PAO1(△gshB中从0.47μg/mL提高到1.73μg/mL，差异十分显著(P＜0.01)，在PAO1中从1.3μg/mL提高到1.9μg/mL，差异显著(P＜0.05)，表明GSH对铜绿假单胞菌生产PCN有促进作用。

It was showed that the growth speed of hypha, sclerotinia production and the pathogenicity of strains had little relation with host and geographical location. The ability of oxalic acid production of strains had positive relation with the pathogenicity. In order to study the nutrition aptness, 8 kinds of culture mediums were tested and the result showed that S.

sclerotinia不同菌株菌丝的生长速度、菌核产量、致病力与其地理来源和寄主来源关系不大，对12个代表菌株的草酸产生能力的测定表明，菌株的草酸产生能力和病菌的致病性基本呈正相关，致病力较强的菌株草酸产生能力较强；采用8种培养基对代表菌株营养条件进行了研究，结果表明核盘菌S。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。