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George S. Mahuku Jhon Jaime Riascos 《European journal of plant pathology / European Foundation for Plant Pathology》2004,110(3):253-263
Virulence on a standard set of 12 common bean differential varieties, DNA sequence of repetitive-elements (Rep-PCR) and random amplified microsatellites (RAMS) were used to assess the genetic variability of 200 Colletotrichum lindemuthianum isolates collected from Andean and Mesoamerican bean varieties and regions. High levels of pathotypic (90 pathotypes) and genetic diversity (0.97) were identified among 200 isolates, revealing that C. lindemuthianum is a highly diverse pathogen. Although a significant number of pathotypes were common to Andean and Mesoamerican regions, many more were only found in the Mesoamerican region. Cluster analysis of virulence and molecular data did not separate isolates into groups that were structured with common bean gene pools. No genetic differentiation (G
ST=0.03) was apparent between Andean and Mesoamerican isolates of C. lindemuthianum. The diversity exhibited by C. lindemuthianum does not appear to cluster according to common bean gene pools, and the high diversity found in the Mesoamerican region seems to indicate that C. lindemuthianum originated and was disseminated from this region. Due to the high genetic variation exhibited by C. lindemuthianum, stacking major resistance genes appears to be the best option for developing cultivars with durable anthracnose resistance. 相似文献
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A. Lehtijärvi H. T. Doğmuş‐Lehtijärvi A. G. Aday Kaya S. Ünal S. Woodward 《Forest Pathology》2017,47(6)
Although several Armillaria species have been reported in Turkey, there is little information about their ecology in Turkish forests. In this study, we investigated five forest stands, approximately 5–74 ha in size, in Kastamonu province in the Black Sea Region of Turkey for the presence of Armillaria species in stumps and logs. The stands were mixed Abies nordmanniana ssp. bornmülleriana and Pinus sylvestris forests managed using a selective cuttings system; the proportion of fir in the total number of stems and stumps ranged from 36 to 98%. Based on sequence analysis of the internal transcribed spacer and intergenic spacer regions of the rDNA, all rhizomorphs sampled from the stumps and logs were of Armillaria ostoyae. The size of the genets was estimated with random amplified microsatellites analysis of the isolates and ranged from single stumps to approximately 450 m2. One to seven genets were found in each stand. These results indicate that the genets had arisen from spores and vegetative spread was limited on most sites. 相似文献
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Rebecca Ford Kenny Le Roux Catherine Itman Jan Bert Brouwer Paul W.J. Taylor 《Euphytica》2002,124(3):397-405
Pisum sativum specific sequence tagged microsatellite site primers were used to amplify genomic profiles from 15accessions of P. sativum L. that represented the genetic base of the Australian field pea-breeding program and five accessions of the wild related
species P. fulvum. The STMS primers were used to assess genetic relationships among the Pisum accessions in two ways. Firstly, to produce RAPD-like multiple banding marker profiles using an adapted RAMS method, for
intra- and interspecific diversity analysis. From the 14 flanking primer pairs assessed, 133 markers were obtained. Conservation
and reproducibility of markers among individuals within accessions was demonstrated. The largest distance observed among P. sativumaccessions was 22% and among P.fulvum accessions was 40%, similar to that revealed with other PCR-based methods. The maximum distance between P.sativum and P. fulvum accessions was 46%. Phylogenetic clustering of P. sativum accessions, using the neighbour joining method and based on simple matching distances, was distinct and distant to P. fulvum. Secondly, PCR with a higher annealing temperature and fluorescent labeling identified simple and allelic loci markers useful
for creating agenotype/fingerprint database for P. sativum cultivars. This is the first report to demonstrate the use of Pisum specific STMS sequences for both diversity analysis and genotype identification.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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北半球高卢蜜环菌的遗传多样性与分子鉴定 总被引：6，自引：0，他引：6
从北美、欧洲和中国收集２３个高卢密环菌菌株，ＰＣＲ扩增其rDNA的ＩＧＳ和ＩＴＳ区域，用ＡluI,HaeIII,HinfI和ＴagI四种限制性内切酶进行酶切，同时结合随机扩增微卫生（ＲＡＭＳ）多态性，对北半球的高卢蜜环菌的遗传多样性进行了分析，结果发现了高卢蜜环菌的６种ＩＧＳ－ＲＦＬＰ图谱类型，其中gal(B)和gal(D)是国内外无报道的新的ＩＧＳ－ＲＦＬＰ型，ＲＦＬＰ系统树发现该种有明显的大陆之间的遗传分化，存在中国，欧洲，北美和亚洲４个亚群体，ＲＡＭＳ分析表明北半球高卢蜜环菌存在亚洲，欧洲，北美－中国和北美－欧洲和北美－欧洲等４个高卢蜜环菌发育系，而且不同大陆的高卢蜜环菌具有较近的亲缘关系，而相同大陆的却具有不同的起源，特别是北美的高卢蜜环菌两个发育系异源性很高，北美东部的发育系同欧洲的关系比较近，而北西部的同亚洲关系比较近，同时表明ＲＡＭＳ技术是分析菌物种内遗传多样性的优越方法。 相似文献
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Sari Paavanen-Huhtala Hanna Avikainen Tapani Yli-Mattila 《European journal of plant pathology / European Foundation for Plant Pathology》2000,106(2):187-198
The randomly amplified polymorphic DNA (RAPD) technique was used to develop strain-specific primers for Gliocladium catenulatum strain J1446, which is promising in biological control. One of the primer pairs developed proved to be strain-specific; strain J1446 was differentiated from 16 G. catenulatum strains and six other strains of two Gliocladium species, as well as from Trichoderma virens, and isolates of Nectria spp. and Fusarium spp. Specific primers were also tested with DNA isolated from cucumber leaves, treated or untreated with a solution made from Gliocladium powder. The expected amplification product was produced only from treated leaves. DNA isolated from Gliocladium-treated potato tubers and fungi grown in peat was also used in amplification reactions. Strain-specific primers detected strain J1446 when the amount of DNA was 5pg or more. Some variation between the Gliocladium strains was found by the random amplified microsatellites method (RAMS) and the universally primed polymerase chain reaction method (UP-PCR), but no clear fragments specific to strain J1446 were produced. Cross-blot hybridisation of UP-PCR products differentiated strain J1446 from T. virens, but not from the Gliocladium isolates. The 28S rDNA sequences and -tubulin sequences were identical or very similar in all Gliocladium strains. Thus, it is possible that the Gliocladium strains of the present study are conspecific, which means that a revision in the taxonomy of Gliocladium species may be necessary. 相似文献
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为阐明来自不同寄主的五针松疱锈病菌的关系,了解其遗传多样性水平,并为今后研究该菌内的遗传变异和流行监控提供依据,该文采用RAMS （Random Amplified Microsatellite）标记对吉林、辽宁红松疱锈菌的4个居群和云南、四川华山松疱锈菌3个居群的遗传多样性进行了研究。从18条引物中筛选出5条对全部菌株进行了扩增,共检测到42个可重复的有效位点, 其中多态位点有25个,多态位点比率为59.52%,Nei’s基因多样度指数H=0.252 4,Shannon多样性信息指数Hsp=0.362 7,基因流Nm=0.136 5。分析结果表明:不同寄主来源疱锈菌群的遗传多样性高于同一寄主来源疱锈菌群;同一寄主来源的疱锈菌居群间存在遗传差异,但程度小于居群内。基于遗传距离,用NJ法对各居群间进行聚类分析的系统树显示,来自红松和华山松的疱锈菌形成独立的分支,相互间的遗传距离很大,说明两者在遗传上有显著的异质性。 相似文献
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Séverine Cohen Valérie Allasia Paul Venard Sylvia Notter Christian Vernière Franck Panabières 《European journal of plant pathology / European Foundation for Plant Pathology》2003,109(8):791-805
Isolates of Phytophthora pathogenic to citrus crops on Eastern Corsica and associated with gummosis were identified by PCR-RFLP of internal transcribed spacers (ITS) sequences and characterized by the random amplified microsatellites (RAMS) technique. A sample of 114 isolates collected from diseased trunks and fruits, and from soil, were overwhelmingly Phytophthora citrophthora. Further analysis indicated that the P. citrophthora population was not homogeneous in citrus groves. There were two groups, with a few (4%) atypical isolates in two marginal groups. The major groups have been re-examined in the light of mating behaviour, RFLPs of mitochondrial DNA and sequence comparisons of ITS regions of rDNA. They were found distinct with all these criteria and perhaps constitute distinct taxa. The results indicate that important modifications occurred in the population structure of P. citrophthora over time in Corsican groves. These changes may have impact on the recent outbreaks of gummosis. 相似文献
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