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   susceptible 在 植物保护 分类中 的翻译结果: 查询用时:0.013秒
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感染性疾病及传染病
皮肤病与性病
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susceptible
相关语句
  敏感
    Using real-time quantitative PCR, mRNA expression levels of CYP6AE12 and CYP9A18 were compared between the resistant strain YS-FP (derived from a susceptible strain YS through laboratory selection) and the YS strain respectively.
    用实时定量PCR技术分析了这2个基因在棉铃虫YS敏感品系和YS-FP抗性品系(由氰戊菊酯加辛硫磷混剂筛选YS品系而得)6龄幼虫脂肪体和中肠中mRNA的表达水平。
短句来源
    Susceptible Helicoverpa armigera (Hubner) strain was used as the insect hosts to study the effect of transgenic Cry1 A+CpTI cotton on the development of the parasitoid, Microplitis mediator (Haliday).
    以多年饲养的敏感棉铃虫为寄主,在室内研究了转Cry1A+CpTI双价基因抗虫棉对中红侧沟茧蜂的影响。
    Successive generation screenings were conducted for the resistance of striped stem borer Chilo suppressalis (Walker) to cry1Ab (after 10 generations selection, cry1Ab-R) and cry1Ac (after 7 generations selection, cry1Ac-R) reared on synthetic diets separately containing sublethal dosages of the two toxic proteins. The results showed that, in comparison with the susceptible strain (reared on the diet without toxic protein), the resistance of C.
    取食分别用含亚致死剂量的cry1Ab和cry1Ac毒蛋白的人工饲料饲喂二化螟(Chilo suppressalis)进行继代抗性筛选,cry1Ac筛选了7代、cry1Ab筛选了10代后,与敏感品系相比,cry1Ab-R筛选品系对 cry1Ab的敏感性下降1.54倍,cry1Ac-R筛选品系对cry1Ac的敏感性下降3.38倍。
    as fed on cry 1 Ab diet, the larval survival of cry 1 Ab- R slrain was much more higher than that of susceptible strain, while there was no significant difference between the larval survivals of cry 1 Ac- R strain and susceptible strain, as fed on cry1 Ac diel.
    cry1Ab-R筛选品系取食含cry1Ab的饲料后,幼虫存活率与敏感品系相比明显增加,但取食含 cry1Ac饲料后,cry1Ac—R筛选品系与敏感品系的幼虫存活率差异不显著。
    Differential proteomic analysis of Bt Cry1Ac toxin-resistant and susceptible BTI-Tn-5B1-4 cells
    Bt Cry1Ac毒素筛选的粉纹夜蛾离体抗性细胞与敏感细胞蛋白质组的差异分析
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  感病
    A Comparative Study on the Variation of Peroxidase Isoenzyme in Seveval Susceptible Plants
    几种植物感病后过氧化物酶同工酶变化的比较研究
短句来源
    Induced-resistance effects were investigated after treated 7days on resistant cultivar and susceptible cultivar,and the results showed that the effective percentage was 30.43% and 21.21% respectively.
    处理7 d后SA在抗病品种和感病品种上表现出的诱抗效果分别达30.43%和21.21%。
短句来源
    With a F2 population derived from 66 ×A18 as materials,polymorphism between resistant and susceptible bulk of cucumber anthracnose were studied using BSA method and AFLP technology. A codominant AFLP marker,E24M48-251 bp/245 bp,was screened.
    以黄瓜抗炭疽病母本66和感炭疽病父本A18及其F2代分离群体为试材,采用BSA法和AFLP技术建立了对炭疽病的抗病组和感病组,AFLP引物组合E24M48在抗感组间表现多态性,且呈共显性。
短句来源
    While in same disease grade of the resistant and susceptible inbred lines,there was no obvious difference on RBSDV concentration(F=0.775,P=0.598).
    而相同病级的抗病、感病和中抗玉米自交系叶片内的RBSDV浓度无显著差异(F=0.775,P=0.598);
短句来源
    The results of this study showed that there were significant differences among the 9 lines,in which lines of 85198 and 203 were susceptible to bacterial wilt,whereas lines of 47254,51255,7585,and 85254 showed resistance to bacterial wilt.
    结果表明:这9个品系的抗性水平存在显著差异,85198和203为感病品系,47254,51255,7585和85254为抗病品系。
短句来源
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    A Comparative Study on the Variation of Peroxidase Isoenzyme in Seveval Susceptible Plants
    几种植物病后过氧化物酶同工酶变化的比较研究
短句来源
    STUDIES ON RESISTANCE OF RICE VARIETY, NJ14,TO BROWN PLANTHOPPER,NILAPARVATA LUGENS (Stal) Ⅱ. DIFFERNT UTILIZATION OF FREE AMINO ACIDS IN RESISTANT AND SUSCEPTIBLE RICE
    水稻品种南京14号对褐飞虱抗性的研究──Ⅱ.褐飞虱对抗水稻品神叶鞘内游离氨基酸的利用差异
短句来源
    RAPD markers OPAI17-1550 and OPAI13-900,linked to anti-black-spot disease gene locus,were successfully converted into SCAR markers named SAI17-1570 and SAI13-292 respectively by sequencing and designing of primers. SAI17-1570 and SAI13292 were validated in the resistant、susceptible pools and F1 population.
    通过测序和引物设计,将与美洲黑杨抗黑斑病基因相连锁的RAPD标记OPAI17-1550和OPAI13-900成功地转化成显性SCAR标记(SAI17-1570)和共显性SCAR标记(SAI13-292),并对、抗病池和F1代91个无性系进行了SCAR标记检测。
短句来源
    Induced-resistance effects were investigated after treated 7days on resistant cultivar and susceptible cultivar,and the results showed that the effective percentage was 30.43% and 21.21% respectively.
    处理7 d后SA在抗病品种和病品种上表现出的诱抗效果分别达30.43%和21.21%。
短句来源
    With a F2 population derived from 66 ×A18 as materials,polymorphism between resistant and susceptible bulk of cucumber anthracnose were studied using BSA method and AFLP technology. A codominant AFLP marker,E24M48-251 bp/245 bp,was screened.
    以黄瓜抗炭疽病母本66和炭疽病父本A18及其F2代分离群体为试材,采用BSA法和AFLP技术建立了对炭疽病的抗病组和病组,AFLP引物组合E24M48在抗组间表现多态性,且呈共显性。
短句来源
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  “susceptible”译为未确定词的双语例句
    Therefore, PCA=10(INR=5.0) might be a threshold in determining "responders" to discriminate the resistant and susceptible rodent administrated by 4.0 mg/kg bromadiolone. Conclusion BCR might be applicable method to monitor the resistance against anticoagulant rodenticides of commensal rodents.
    结论以区分剂量4.0mg/kg溴敌隆作用后,PCA=10(或INR=5.0)作为阈值来区分黄胸鼠抗药性与敏感性个体,是准确、简便、易行的抗药性测定方法。
短句来源
    Additionally,tricin(500μg/ml) significantly inhibited oviposition and feeding of the brown planthopper females in choice tests when spread on susceptible rice plant(TN1).
    用500μg/ml的麦黄酮溶液涂抹到对褐飞虱敏感的水稻品种TN1植株上对褐飞虱雌成虫有明显的拒食作用和忌避产卵作用。
短句来源
    Lambda-cyhalothrin showed LD_ 50 value of 0.9672 μg/larva at F_1 generation and decreased gradually in onward generations,resulting in LD_ 50 value of 0.0325 μg/larva at F_ 43 generation by using topical application,and the resistance level of the non-selected strain decreased from 4 836.0-fold to 162.5-fold compared with the susceptible strain.
    用点滴法测定不同世代3龄幼虫抗性结果为:室内F1代LD50值为0.9672μg/头,抗性倍数为4836.0倍,以后各世代逐渐降低,至F43代LD50值为0.0325μg/头,抗性倍数为162.5倍,抗性水平下降了29.8倍。
短句来源
    In leaf dipping bioassay,lambda-cyhalothrin exhibited LC_ 50 value of 185.6 mg/L at F_1 generation and decreased gradually to onward generations with LC_ 50 value of 9.2 mg/L at F_ 43 generation. Correspondingly,the resistance level of the non-selected strain decreased from 964.7-fold to 47.8-fold compared with the susceptible strain.
    用浸叶法测定不同世代3龄幼虫抗性结果为:室内F1代LC50值为185.6mg/L,抗性倍数为964.7倍,以后各世代也逐渐降低,至F43代LC50值为9.2mg/L,抗性倍数为47.8倍,抗性水平下降了20.2倍。
短句来源
    Random Amplified Polymorphic DNA (RAPD) and Simple Sequence Repeat (SSR) was employed as tools to detect molecular markers linked to Fusarium wilt resistant gene in the watermelon wild germplasm (Citrullus lanatus var. citroides). From screening the Fusarium wilt resistance of F_2 population consisted by the introgression of Fusarium wilt resistant gene from PI296341 into the susceptible inbred 97103 by using root- dip inoculation, the pools of Fusarium wilt resistance and susceptibility were estabhshed.
    运用随机扩增多态性DNA(Random amplified polymorphic DNA,RAPD)与简单重复序列(Simple sequence repeat,SSR)技术,采用混合分组分析(bulked segregant analysis,BSA)方法进行了西瓜野生种质(Citrullus lanatus var.citroides)PI296341抗枯萎病基因连锁的分子标记研究.
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  susceptible
This paper considers an SIRS epidemic model that incorporates constant immigration rate, a general population-size dependent contact rate and proportional transfer rate from the infective class to susceptible class.
      
An improved susceptible-infected-susceptible (SIS) model in the local-world evolving network model is presented to study the epidemic spreading behavior with time delay, which is added into the infected phase.
      
Biocides should be introduced into systems susceptible to biocorrosion at the start of their exploitation, otherwise higher concentrations or synergistic compositions have to be used.
      
A microbial association in the culture medium averaging 106 yeast cells/l and 108 bacterial cells/l is more susceptible to technogenic impacts and seasonal fluctuations.
      
However, cells subjected to oxidative stress are significantly less susceptible to the reactivating effect as compared to their UV-irradiated or heated counterparts.
      
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The headblight or scab of wheat caused by Gibberella zeae (Schw.) Petch.has in recent years become more prevalent in the rice-wheat growing area ofEastern China with two heavy epidemics in 1952 and in 1954.It was reportedfrom this area that wheat varieties showed marked differences in their susceptibilityto headblight and that native varieties in general were less susceptible than theimproved ones.It was also reported that the degree of susceptibility appeared tobe related to the stage of host development.In...

The headblight or scab of wheat caused by Gibberella zeae (Schw.) Petch.has in recent years become more prevalent in the rice-wheat growing area ofEastern China with two heavy epidemics in 1952 and in 1954.It was reportedfrom this area that wheat varieties showed marked differences in their susceptibilityto headblight and that native varieties in general were less susceptible than theimproved ones.It was also reported that the degree of susceptibility appeared tobe related to the stage of host development.In 1952,varieties with earlier date ofheading were generally less susceptible than those which headed late. Varietal tests for the headblight resistance were made in Nanking in 1952and 1954.In 1952,235 varieties and hybrids were studied for their resistance toscab under natural conditions in the field.Great differences were found in theirdegree of infection,although none of them was immune.The percentages of in-fected heads ranged from 0.9 to 89.1 with most of them having 10 to 40% infec-tion.No definite correlation was seen between the percentage of infection andthe date of heading or of maturing.In 1954,tests on varietal resistance to scabwere again made with 40 varieties and hybrids including those being relatively lesssusceptible in the previous test.Attempts were made to induce epidemics in thefield by means of artificial inoculation.Results indicated that both mycelial andconidial suspensions were similarly effective for artificial inoculation.The averagepercentages of infected heads in the inoculated plots ranged from 4.2 to 77.7 incontrast to the uninoculated plots where the average percentages of infected headsbeing only trace to 7.1 with one variety not infected. From the experimental results obtained in 1952 and 1954,it was found thatrelative stability in resistance to headblight existed among different wheat varie-ties,although there was great variation in varietal resistance due to the effect ofenvironmental factors.Two hybrids,"5201" and "5204",were found to be muchmore resistant than all other varieties tested in both years.Hybrid "5204" gave ??0.9% of infected heads in 1952 and 3.4% in 1954,and hybrid "5201" gave5.5 and 9.0% of infected heads in the respective years.Both hybrids also possessother desirable characteristics such as early maturity,relative high yield,stiffystems,and high resistance to the stripe rust. Greenhouse studies were made in 1954 with two susceptible varieties ofwheat for testing their susceptibility to headblight at six different stages of deve-lopment from shooting to hard dough.Results indicated that the plant was sus-ceptible at all these stages of development with a tendency of being more heavilyinfected toward maturity.It was also observed that temperature had obvious effecton the degree of infection.Plants inoculated at flowering stage were more heavilyinfected when kept at 25℃ after inoculation than when kept at 15℃.However,the inoculated plants kept at 25℃ during the day and at 15℃ at night resultedin a degree of infection similar to those kept at 25℃ all the time.

(一)小麦赤微病在苏、浙、皖的稻麦两熟地区经常严重发生,1952及1954年两度猖獗流行,造成苏南及浙江地区小麦生产上的严重损失。通过调查,发现各地小麦品种对病害的反应确有显著差异。地方品种,一般发病较轻,而改良品种如“2905”、“2419”、“玉皮”、“矮立多”等,常常严重地感染病害。(二)1952年在自然情况下,观察此较235个小麦品种结果,虽没有一个品种不发病,但品种间的发病率相差极大,自0.9%至89.1%,而不同品种感染程度的轻重与抽穗期及成熟期的早迟关系不大。(三)1954年大田人工接种结果,效果显著,供试40个品种接种区的最高发病率达77.7%,而自然感染区的最高发病率只有7.1%。在接种试验中,初步证明:(1)大量有效的病原体与适合病害发生的气候因子同是病害流行的主要条件;(2)接种方法,用菌丝体接种与用分生孢子接种的效果,并无多大差别;(3)品种的抽穗先后,与发病轻重无一定关系。(四)温室试验指出,小麦自抽穗至糊熟各期麦穗被害率相似,但小穗的被害率在抽穗期最低,开花以后,有愈近成熟感染程度愈重的趋势。(五)开花期接种后的小麦,置於25℃的麦穗被害率和置於15℃的相似,但前者的小穗被害率此后...

(一)小麦赤微病在苏、浙、皖的稻麦两熟地区经常严重发生,1952及1954年两度猖獗流行,造成苏南及浙江地区小麦生产上的严重损失。通过调查,发现各地小麦品种对病害的反应确有显著差异。地方品种,一般发病较轻,而改良品种如“2905”、“2419”、“玉皮”、“矮立多”等,常常严重地感染病害。(二)1952年在自然情况下,观察此较235个小麦品种结果,虽没有一个品种不发病,但品种间的发病率相差极大,自0.9%至89.1%,而不同品种感染程度的轻重与抽穗期及成熟期的早迟关系不大。(三)1954年大田人工接种结果,效果显著,供试40个品种接种区的最高发病率达77.7%,而自然感染区的最高发病率只有7.1%。在接种试验中,初步证明:(1)大量有效的病原体与适合病害发生的气候因子同是病害流行的主要条件;(2)接种方法,用菌丝体接种与用分生孢子接种的效果,并无多大差别;(3)品种的抽穗先后,与发病轻重无一定关系。(四)温室试验指出,小麦自抽穗至糊熟各期麦穗被害率相似,但小穗的被害率在抽穗期最低,开花以后,有愈近成熟感染程度愈重的趋势。(五)开花期接种后的小麦,置於25℃的麦穗被害率和置於15℃的相似,但前者的小穗被害率此后者高。日间25℃和夜间15℃交替的变温处理,发病情形与始终置於25℃的相近。(六)不同小麦品种对于赤微病具有相对稳定的抵抗性或感染性。“5201”及“5204”等杂交系,在自然感染和人工接种情形下,发病都很轻微,并且具有早熟、丰产、秆硬和高度抵抗条锈等优良特性。

Among collections chiefly from North China,different races of Pucciniaglumarum were identified by means of differential hosts used by Gassner & Straibor a set of improved varieties of wheat grown in China. Among 14 improved varieties,marked differences in resistance to stripe rustwere observed.Li-Yung I was resistant to 40 out of 50 collections of striperust,with unstable reactions to 7 collections; Nanking 4197 was resistant to 37 ??collections with unstable reactions to 9 collections; while Yechao 35368 and...

Among collections chiefly from North China,different races of Pucciniaglumarum were identified by means of differential hosts used by Gassner & Straibor a set of improved varieties of wheat grown in China. Among 14 improved varieties,marked differences in resistance to stripe rustwere observed.Li-Yung I was resistant to 40 out of 50 collections of striperust,with unstable reactions to 7 collections; Nanking 4197 was resistant to 37 ??collections with unstable reactions to 9 collections; while Yechao 35368 and Ye-Ta 1885 were susceptible to all except 5 collections from FJymus ckinense.Theinstability of varietal reactions is one of the principal obstacles in identification.As a consequence,tests with 6 improved varieties including Early Premium,Pi-Ma 1,etc.,only 21 out of 50 stripe rust collections could be differentiated into10 distinctly different races (Y 1 to Y10).However,there were great differencesin pathogenicity among different races so far identified.All the 6 improvedvarieties were resistant to race Y 1 and susceptible to race Y 2.The virulenceof other races differed from one another also pronouncedly. Races Y2,Y3,Y4,Y5 ,Y6,Y7 ,and Y8 were collected from wheat; Y 9 andY10 from Agropyron spp.; and Y1 was collected mainly from Elymus chinense(including 1 collection from wheat).Races Y 1,Y 3.Y 4,Y 5,Y 7,Y 8,Y 9,Y 10were found in Hopeh; Y 1,Y 2,Y 6,Y 7 in Shansi; and Y 6 in Shantung. All collections could be readily grouped into 16 different forms if the highestreaction type was taken as a basis for identification (this method of groupingwas adopted by Fang et al).Comparing the results with that of Fang et al,itappeared that reactions of certain varieties,such as Early Premium,Li-Yung 1 tocollections from North China were distinctly different from their reactions tocollections from East China.This suggested strongly that races of stripe rustorganism between these two regions might be quite different. All wheat varieties tested were found to be resistant to stripe rust collectionsfrom Elymus chinense.whereas collections from Elymus sibiricus and Agropyronspp.were capable of attacking many wheat varieties. Single spore infection of stripe rust frequently resulted in sporulation on thewhole leaf blade.This is definitely much more systemic than infections of eitherstem rust or leaf rust organism.Inoculations with single uredospores and mono-uredospore lines often produced mixtures of infection types ranging from resistantto susceptible on same leaf blades.This is analogous to "X" type reactions re-ported in stem rust and leaf rust literature; therefore,"X" type reaction shouldalso be recognized in the study of stripe rust.

1950年以来自华北以及少数其他地区搜集的条銹菌种,不論在Gassner和Straib所用的鑒定寄主或在国內推广品种上鑒定,都可区分出許多不同的类型。所用14个推广品种对于这些条绣菌种的抗病性有着很大的差別;其中以驪英1号最抗病,对50个菌种中的40个菌种是抵抗的,对7个菌种反应不稳定;金大4197次之,对37个菌种是抵抗的,9个菌种反映不稳定;燕交35368及燕大1885除了对5个碱草(Elymus chin-ense)条銹菌种抵抗外,对其他所有菌种的反应都是感染型。品种反应的不稳定,是鑒定工作中的主要困难。加根据早洋麦、农大3号、碧螞1号、碧螞4号、驪英3号、玉皮麦等6个品种的稳定反应加以分析,仅能將50个菌种中的21个区分成10个显著不同的类型。这6个品种对第一类型均为抵抗,对第二类型均为感染,其他类型的致病力介于二者之間。在这10个类型中,类型Y_2,Y_3,Y_4,Y_5,Y_6,Y_7,Y_8采自小麦;类型Y_9,Y_(10)采自Agropyron spp.;类型Y_1主要采自Elymuschinense(包括一个小麦菌种)。河北出現的类型有Y_1,Y_3,Y_4,Y_5,Y_7,Y_8,Y_9,...

1950年以来自华北以及少数其他地区搜集的条銹菌种,不論在Gassner和Straib所用的鑒定寄主或在国內推广品种上鑒定,都可区分出許多不同的类型。所用14个推广品种对于这些条绣菌种的抗病性有着很大的差別;其中以驪英1号最抗病,对50个菌种中的40个菌种是抵抗的,对7个菌种反应不稳定;金大4197次之,对37个菌种是抵抗的,9个菌种反映不稳定;燕交35368及燕大1885除了对5个碱草(Elymus chin-ense)条銹菌种抵抗外,对其他所有菌种的反应都是感染型。品种反应的不稳定,是鑒定工作中的主要困难。加根据早洋麦、农大3号、碧螞1号、碧螞4号、驪英3号、玉皮麦等6个品种的稳定反应加以分析,仅能將50个菌种中的21个区分成10个显著不同的类型。这6个品种对第一类型均为抵抗,对第二类型均为感染,其他类型的致病力介于二者之間。在这10个类型中,类型Y_2,Y_3,Y_4,Y_5,Y_6,Y_7,Y_8采自小麦;类型Y_9,Y_(10)采自Agropyron spp.;类型Y_1主要采自Elymuschinense(包括一个小麦菌种)。河北出現的类型有Y_1,Y_3,Y_4,Y_5,Y_7,Y_8,Y_9,Y_(10);山西出現有类型Y_1,Y_2,Y_6,Y_7;山东出現有类型Y_6。品种不稳定反应除通过选擇反应較为稳定的品种来克服外,同时还須严格掌握温室条件。如以品种的最高反应为标准(如方中达、陈迺用所采用),則可將上面50个菌种分成16个不同的类型。与华东的結果比較,許多品种如早洋麦、驪英1号等对兩个地区条銹病菌的反应适相反,表明华东和华北条锈菌的致病力可能有很大的差別。Elymus chinense的条銹菌与小麦条绣菌的致病力有極大差异,所测定的小麦品种对前者均抵抗。Elymus sibiricus和Agropyron spp.的条绣菌則能正常侵染多种小麦品种的幼苗。条銹菌在小麦叶片內能适当的扩展,較秆銹菌和叶銹菌更有系統性,單孢子接种約在二星期左右可蔓延到整个叶片。同一叶片上常出現抗病和感病的反应,用單孢及單孢菌系接种,得出同样結果。条绣菌的鑒定标准中除了原有的反应型外,还应加入混合型“X”一項。

In recent years,a new disease of the foxtail millet (Setaria italica (L.) Beauv.)has been reported to occur in epiphytotic scale in most of the millet growning areasof North China.On account of the brilliant red pigmentation of the infected plant,the disease is generally referred to by the farmers as the red-leaf disease.However,the symptoms on the millet plants varied with different varieties.In general,thecharacteristic symptom exhibited on the "purple-stem" varieties was the the redden-ing of the leaf blade,leaf...

In recent years,a new disease of the foxtail millet (Setaria italica (L.) Beauv.)has been reported to occur in epiphytotic scale in most of the millet growning areasof North China.On account of the brilliant red pigmentation of the infected plant,the disease is generally referred to by the farmers as the red-leaf disease.However,the symptoms on the millet plants varied with different varieties.In general,thecharacteristic symptom exhibited on the "purple-stem" varieties was the the redden-ing of the leaf blade,leaf sheath and spike,particularly the bristle,while that onthe "green-stem" varieties was the yellowing of the leaf blade.In all instances,thediscoloration was usually accompanied by shortening of internode,stunting of thewhole plant.wrinkling of leaf surface,slight waviness of leaf margin,deformationof spike and underdevelopment of root systems.Plants infected at an early stagewere severely stunted and on heads were produced. It has been demonstrated that the red-leaf disease of the foxtail millet was causedby a virus readily transmitted by at least three different species of grain-infestingaphids:corn aphid,Rhopalostiphum maidis Fitch;grain aphid,Macrosiphum granari-um Kirby;and green-bug,Toxoptera graminum Rond.Tests with non-viruliferouscorn aphid eliminated the possibility of direct aphid injury as the cause of the disease. ??The virus was not transmissible by mechanical inoculation,by seeds nor through thesoil. Studies on the mode of transmission of red-leaf virus by corn aphid indicatedthat the virus was persistent in its insect vector and could infect in succession aseries of at least 27 tested millet seedlings.The aphid was unable to acquire thevirus in a 5-minute feedling period on the virus source but was able to pick up thevirus in 10-minute period.The 8-hour acquisition feeding period was optimum forthis aphid.The testing feeding period was found to be not more than 5 minutesand a 4-hour period of confinement on the diseased plant was ample for the aphidto cause maximum infection.Attempts to transmit the virus with cotton aphid.Aphisgossypii Gloner peach aphid,Aphis persicae Sehult and soybean aphid,Aphis glycinesMats,have given negative results.The incubation period for symptoms of the red-leaf virus in foxtail millet ranged from 10 to 32 days with the model period beingbetween 14 to 20 days. Under natural conditions,certain cultivated cereals and grass weeds showed thesymptoms resembling the red-leaf disease of foxtail millet.Among them,were ZeaMays L.,Panicum miliaceum L.,Setaria lutescens (Weigel) Hubb.,S.viridis (L.)Beauv.,Digitaria sanguinalis (L.) Scop.Echinochloa crusgalli (L.) Roem.,Eragrostiscilianensis (All.) Link,E.pilosa (L.) Beauv.,Arundinella anomala Steud,Spodiopogonsibiricus (Steud.) Trin.,Bothruochloa ischaemum (L.) Keng.,Capillipedium parviflor-um (R.Br.) Stapf and Poa practensis L..Artificial inoculation with the corn aphidproved that the first six named plant species,including the two cereals,were susce-ptible to the red-leaf virus and they produced,in all cases,the typical symptoms.Tests with the rest sexen grass weeds are in progress. The results of disease control experiments by timely spraying with an insecticide,E605,under field conditions were inconsistent.Among the 349 foxtail millet varie-ties of foxtail millet examined in the experimental field,nine of them were foundto be highly torelant to and suffered only very slightly from the attack of the red-leaf virus.These varieties were,however,succeptible in aphid transmission experiments. Available evidences point to the conclusion that the red-leaf virus of the foxtail millet herin reported is quite different from all the previously described cereal viruses.Among the cereal virus that closely resembles the red-leaf virus is the yellow-dwarfvirus reported by Oswald tnd Hauston.These two viruses are similar in the follow-ing respects:both are transmissible by the same species of aphids (Rhopalosiphummaidis,Microsiphum graminium andToxoptera granarium) and neither virus can betransferred mechanically.But they differ strikingly from each other in their hostranges.According to Oswald and Hauston,there were 19 of 55 grasses tested thatappeared to be immune from the yellow-dwarf virus.Digitaria sanguinalis,Echino-chloa crus-galli Setaria viridis and Zea Mays were among the immune hosts.On thecontary,all these four gramineous plants were found to be extremely susceptible tothe red-leaf virus both under natural condition and in artificial inoculation experi-ments.Accordingly,the red-leaf,a persistent aphid borne virus affecting the foxtailmillet,is herein reported as a new virus of the cereals.

小米红叶病是在我国华北分布普遍和为害严重的一种小米病害。病害的症状,在紫杆的小米品种上面,主要的是叶片、叶鞘和穗变紅;在青杆品种上面是叶片黄化。無論如何,紫杆和青杆品种病株除变色外,都可随伴各种畸形,包括植株矮化、叶面绉折、叶綠波状、穗变形和根系發育不良。紅叶病是一个借蚜虫傳播的病毒病害衩籽痢⒙蟪す苎梁吐蠖硌辆軅鞑ゲ『?其中以玉米蚜为最重要。曾經测定玉米蚜在病株上面吸食获得病毒和在健株上面吸食所需最短的时間;带毒玉米蚜的数目和傳病效能的关系谐嵫梁腿舫婢軅鞑 S锰已痢⒋蠖寡梁兔扪羵鞑∥椿竦谜慕Y果。紫杆品种感病后,仅表皮細胞、叶毛細胞和泡状細胞变成紅化,其下层的組織不紅化。叶綠素逐漸消失,但消失过程相当的慢。在病害最末期,維管束內的靱皮細胞少数的坏死,导水管內可能充塞有棕色胶質物,其它細胞無显著的变化。檢查病叶未發現有細胞內含体。用带毒蚜虫作人工接种,証知小米紅叶病病毒能侵染玉米和黍。这两种作物在自然环境下均發生紅叶病。在自然环境下,有以下的禾谷类杂草紅化:金狗尾、青狗尾、馬唐、大画眉草、画眉草、稗、野牯草、大油芒、白羊草、細柄草和六月禾。用玉米蚜作人工接种証明稗、青狗尾、金狗尾、馬唐、六月禾和大油...

小米红叶病是在我国华北分布普遍和为害严重的一种小米病害。病害的症状,在紫杆的小米品种上面,主要的是叶片、叶鞘和穗变紅;在青杆品种上面是叶片黄化。無論如何,紫杆和青杆品种病株除变色外,都可随伴各种畸形,包括植株矮化、叶面绉折、叶綠波状、穗变形和根系發育不良。紅叶病是一个借蚜虫傳播的病毒病害衩籽痢⒙蟪す苎梁吐蠖硌辆軅鞑ゲ『?其中以玉米蚜为最重要。曾經测定玉米蚜在病株上面吸食获得病毒和在健株上面吸食所需最短的时間;带毒玉米蚜的数目和傳病效能的关系谐嵫梁腿舫婢軅鞑 S锰已痢⒋蠖寡梁兔扪羵鞑∥椿竦谜慕Y果。紫杆品种感病后,仅表皮細胞、叶毛細胞和泡状細胞变成紅化,其下层的組織不紅化。叶綠素逐漸消失,但消失过程相当的慢。在病害最末期,維管束內的靱皮細胞少数的坏死,导水管內可能充塞有棕色胶質物,其它細胞無显著的变化。檢查病叶未發現有細胞內含体。用带毒蚜虫作人工接种,証知小米紅叶病病毒能侵染玉米和黍。这两种作物在自然环境下均發生紅叶病。在自然环境下,有以下的禾谷类杂草紅化:金狗尾、青狗尾、馬唐、大画眉草、画眉草、稗、野牯草、大油芒、白羊草、細柄草和六月禾。用玉米蚜作人工接种証明稗、青狗尾、金狗尾、馬唐、六月禾和大油芒均感染小米紅叶病病毒。其它紅化杂草和接种試驗,正在进行中。紅叶病病毒对小米植株所产生的影响,因植株發育的阶段不同而輕重有所差异,植株感病愈早病害愈剧烈。用杀虫剂E605在田間噴射小米防治紅叶病,未能表現药剂有防病的效能,在田間观察349个品种,选得9个高度耐病和农艺性状优良的品种。抗病选种可能是当前防治小米紅叶病最有效的防治措施。根据病原的傳染方法,寄主范围和所表現的症状,小米紅叶病病毒和以往所报道的禾本科植物的病毒病害的病毒均不相同,因此它是禾谷类作物的一个新的病毒。

 
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