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1.
[目的]对在辽宁部分地区采集的番茄细菌性病害病原菌进行鉴定.[方法]对病原菌进行革兰氏染色、培养性状、生理生化特性、16S rRNA基因序列测定以及hrpZpst基因特异性扩增.[结果]鉴定该病原菌为丁香假单胞杆菌番茄致病变种[Pseudomonas syringae pv.tomato (Okabe) Young,Dye & Wilkie].[结论]利用hrpZpst基因特异性扩增可以快速鉴定病原菌.  相似文献   

2.
保护地栽培面积的增加使果蔬病害的防治难度加大,生物防治手段越来越受到青睐。采用平板对峙法、扫描电镜法、5.8S rDNA-ITS序列分析及系统发育树构建对一株从草炭土中分离的菌株进行研究。该菌对番茄灰霉病、番茄叶霉病、番茄绵疫病、番茄黄萎病、番茄枯萎病、杨树烂皮病、杨树枯萎病和黑穗醋栗叶斑病均有抑制作用。扫描电镜显示,该生防菌对番茄灰霉病具有明显抑制作用。5.8S rDNA-ITS序列分析及系统发育树构建表明该菌为淡色生赤壳菌,为果蔬病害的生物防治提供了新的选择。  相似文献   

3.
王志  鲍秀芬 《微生物学杂志》1995,15(2):53-54,60
应用梧宁霉素防治番茄灰霉病的研究初报王志,鲍秀芬,宗玉丽(辽宁省微生物研究所朝阳.122000〕番茄灰霉病(灰葡萄抱,BotrytisCinereaPer’s)是近年来温室、大棚番茄的一种主要病害,其发病率高、危害严重。目前防治该病主要应用化学农药,...  相似文献   

4.
侧孢芽孢杆菌Bl13对番茄早疫病防治效果及机制   总被引:2,自引:0,他引:2  
以对番茄早疫病原菌有良好拮抗效果的侧孢芽孢杆菌Bl13为研究对象,采用盆栽试验,通过测定番茄株高、茎粗、番茄早疫病病情指数、叶片内防御酶活性以及根区土壤微生物多样性、微生物群落结构组成等指标,探究侧孢芽孢杆菌Bl13防治番茄早疫病的效果及机制。结果表明: 接种Bl13可显著降低番茄早疫病的病情指数,提高叶片内多酚氧化酶(PPO)、过氧化物酶(POD)等防御酶活性,降低病害对植物地上部分及根系生长发育的影响。同时,改善番茄根区土壤微生物群落结构,使芽孢杆菌属、假单胞菌属等常见有益菌属相对丰度显著提高,油壶菌属、血赤壳属相对丰度显著降低。侧孢芽孢杆菌Bl13可通过提高番茄叶片内防御酶活性并增加根区中有益微生物的数量来增强植物对番茄早疫病的抗性,从而实现对番茄早疫病的防治。  相似文献   

5.
葫芦岛市保护地番茄灰霉病的发生和防治齐素芳,王宏,马宗超(葫芦岛市植保站,125000)番茄灰霉病在保护地的番茄栽培中,已成为一个主要的病害。据我们调查,保护地番茄一般发病果率为20%,重病果率高达80%以上。该病流行年份发病面积约达50-70%,成...  相似文献   

6.
番茄灰霉病害及其微生物防治的研究进展   总被引:1,自引:0,他引:1  
综述了番茄灰霉病的病害,并从国内外拮抗菌以及内生菌的筛选和利用等方面概述了番茄灰霉病微生物防治的研究进展,提出了目前番茄灰霉病微生物防治的问题及今后的应用前景。  相似文献   

7.
[目的]新发恶性外来入侵物种番茄潜叶蛾的入侵对我国番茄产业的安全生产造成了极大威胁。本文利用@RISK模型对化学防治、生物防治和理化诱控3种不同防治场景下我国番茄产业的潜在经济损失和投入防治后可挽回的经济损失进行综合评估,结果可为我国番茄潜叶蛾综合防治体系的构建提供参考。[方法]基于国内外文献收集到的番茄潜叶蛾危害数据(危害率、番茄产量损失率、防治成本和防治效果),结合全国农产品商务信息公共服务平台、FAO获得我国番茄的种植面积、产量及价格等相关数据,利用@RISK模型对不防治场景和3种不同防治场景下的番茄产业的经济损失进行评估。[结果]番茄潜叶蛾在不防治场景下每年给我国番茄产业造成的经济损失总量在(8226165.67~41903398.26)万元,在化学防治(使用合成杀虫剂)、生物防治(释放天敌昆虫和微生物制剂)和理化诱控(基于灯光和合成性信息素的诱杀产品)3种不同防治场景下能有效挽回经济损失,分别为89.83%、87.90%和89.19%。[结论]基于不同的防治场景能够有效挽回番茄潜叶蛾造成的经济损失,面对该害虫在我国的严峻扩散形势,建议各级政府和行业部门应高度重视并进一步加强番茄潜叶蛾的防控,保障我国番茄产业的安全生产。  相似文献   

8.
[背景]番茄青枯病是由青枯劳尔氏菌(Ralstonia solanacearum)引起的一种土传细菌性病害,该病原菌严重影响番茄的生产。[目的]筛选番茄青枯病的生防细菌,并将其用于病害防治。[方法]采用抑菌圈法、琼脂扩散法从湖南衡阳青枯病发病田的健康番茄根际土壤筛选对青枯劳尔氏菌具有较强拮抗能力的菌株,通过形态学观察、生理生化试验、16S rRNA基因和gyrA基因测序分析确定其分类地位;以单因素试验和正交试验对发酵条件进行优化;通过田间小区试验初探其防效。[结果]筛选的菌株TR-1被初步鉴定为贝莱斯芽孢杆菌(Bacillus velezensislezensis);菌株TR-1最佳培养基配方(g/L):可溶性淀粉20.0,大豆蛋白胨10.0,磷酸氢二钾5.0;最佳发酵条件:pH6.0-7.0,温度30-33℃,摇床转速160 r/min,发酵时长48 h,优化后TR-1无菌发酵上清液对青枯菌抑菌圈直径达2.95 cm,约为优化前的2倍;其田间小区防效为60.30%。[结论]通过对菌株TR-1发酵条件进行优化可大大提升其发酵液抑菌效果,而且菌株TR-1在田间小区试验中对番茄青枯病防效优...  相似文献   

9.
赵建  黄建国  袁玲  时安东  杜如万  刑小军 《生态学报》2014,34(23):7093-7100
为了研发对番茄灰霉病高效、稳定、安全的生物农药,试验利用自主分离获得的寡雄腐霉菌株制备发酵液,采用盆栽试验研究寡雄腐霉发酵液对番茄生长的影响和对灰霉病的防治效果及机制,并在大田生产中验证其生防效果。结果表明,盆栽试验中,寡雄腐霉发酵液促进健康番茄植株生长,植株总生物量和根系生物量分别增加9.5%和15.4%,提高了植株叶绿素含量、根系活力及氮、磷、钾吸收量,并使带病番茄植株的发病率和病情指数分别降低57.2%和60.3%,相对防治效果达60.3%,施用寡雄腐霉发酵液对番茄叶片细胞膜具有保护性,降低丙二醛含量,提高病原性相关酶""超氧化物歧化酶、多酚氧化酶和苯丙氨酸解氨酶活性。后续田间试验中寡雄腐霉发酵液对番茄灰霉病的防治效果达71.2%。说明寡雄腐霉发酵液能有效防治番茄灰霉病,还具有促进番茄生长的作用,并且可诱导番茄植株对病原菌的防御作用,应用前景广泛。  相似文献   

10.
本研究以樱桃番茄成熟红果为样本,以极细链格孢菌为指示菌筛选得到一株对番茄采后病原菌有抑制作用的菌株KL-1。通过平板拮抗试验研究了菌株KL-1对番茄采后常见病原真菌极细链格孢菌、黑曲霉、青霉菌、尖侧多隔孢霉、拟康宁木霉、盐生枝孢霉、子囊菌、胶孢炭疽菌等八种病原菌的抑制作用,同时通过形态学、生理生化及16S rDNA分子生物学特征对菌株进行了鉴定,并对其基本生物学特性进行了研究。结果表明:菌株KL-1对于七种病原菌极细链格孢菌、黑曲霉、青霉菌、拟康宁木霉、盐生枝孢霉、子囊菌和胶孢炭疽菌均有明显的抑制作用,其中对黑曲霉的抑制率最大为81%,对其他六种病原菌抑制率也均高于70%,对尖侧多隔孢霉的抑制率为0,说明菌株KL-1可以抑制番茄多种常见病原真菌,具有开发为生防制剂的潜力。经鉴定KL-1为解淀粉芽孢杆菌(Bacillus amyloliquefaciens);该菌培养9 h内生长最旺盛,最适生长pH为7.0,最适生长温度为37℃。  相似文献   

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12.
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.  相似文献   

13.
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.  相似文献   

14.
The fossil record of bryophytes is generally poor and infertile plants attributable to liverworts and mosses could also be thalloid vascular plant gametophytes or herbaceous lycophytes respectively. The paucity of the bryophytic record could be the result of relatively rapid degradation of bryophytic material in comparison to that of vascular plants, the absence of lignified cells in bryophytes sustaining this belief. However, certain organs of bryophytes are as robust as those of vascular plants (e.g. spores) and the hydroxybenzofuran polymers produced by some mosses could be of similar preservational resistance to lignins. A simplistic experiment to test the relative resistance to decay of bryophytic material has been undertaken. Its findings suggest that bryophytic plant material has a similar preservational potential to that of a selected vascular plant, particularly in organic rich sediments. This result may be construed to imply that bryophytes were indeed less abundant in the preservational environments of the Coal Measures than might be expected on the basis of current palaeoenvironmental reconstructions.  相似文献   

15.
Highlights
1. Class-switch recombination was mimicked in hybridomas through a controllable expression system of activation-induced cytidine deaminase.
2. IgG antibodies were generated through this system in an anti-Flu B IgM hybridoma 7G1.
3. IgG1 and IgG2a subtypes of 7G1 present improved antiviral activity in vitro and in vivo.  相似文献   

16.
Highlights
1. The structure of glycoprotein Gc, responsible for mediating membrane fusion between cell and CCHFV, is revealed, but many more mysteries remain.
2. Why do only antibodies against Gc have neutralizing effect, but not the one against Gn?
3. Why can NAbs against Gc only be protective in the animals in preventive settings, but not in the therapeutic administration?  相似文献   

17.
Highlights:
The biosensor reported in our study can monitor SARS-CoV-2 Mpro activity in living cells instead of in vitro solutions.
The biosensor reported in our study is sensitive and easy to operate.
It is suitable for high-throughput screening.
It has the potential to be used in small animal models.  相似文献   

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<正>Dear Editor,Noroviruses are positive-sense, single-stranded RNA viruses belonging to Caliciviridae and account for more than 50%of all acute gastroenteritis (AGE) outbreaks worldwide and cause an estimated 200,000 deaths per year among children\5 years of age, primarily in developing countries (Hall et al. 2012; Glass et al. 2009). The norovirus genome contains three open reading frames (ORFs).  相似文献   

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