PhytopathologyPub Date : 2024-09-01Epub Date: 2024-08-20DOI: 10.1094/PHYTO-03-24-0090-R
Johanna Wesche, Peishan Wu, Chao-Xi Luo, James E Faust, Guido Schnabel
{"title":"Bioproducts of <i>Pseudomonas chlororaphis</i> Suppress DMI Fungicide-Induced <i>CsCYP51A</i> and <i>CsCYP51B</i> Gene Expression in <i>Colletotrichum siamense</i> and Generate Synergistic Effects with Metconazole and Propiconazole.","authors":"Johanna Wesche, Peishan Wu, Chao-Xi Luo, James E Faust, Guido Schnabel","doi":"10.1094/PHYTO-03-24-0090-R","DOIUrl":"10.1094/PHYTO-03-24-0090-R","url":null,"abstract":"<p><p>Mixtures of fungicides with different modes of action are commonly used as disease and resistance management tools, but little is known of mixtures of natural and synthetic products. In this study, mixtures of metabolites from the rhizobacterium <i>Pseudomonas chlororaphis</i> strain ASF009 formulated as Howler EVO with below-label rates (50 µg/ml) of conventional sterol demethylation inhibitor (DMI) fungicides were investigated for control of anthracnose of cherry (<i>Prunus avium</i>) caused by <i>Colletotrichum siamense</i>. Howler mixed with metconazole or propiconazole synergistically reduced disease severity through lesion growth. Real-time PCR showed that difenoconazole, flutriafol, metconazole, and propiconazole induced the expression of DMI target genes <i>CsCYP51A</i> and <i>CsCYP51B</i> in <i>C. siamense</i>. The addition of Howler completely suppressed the DMI fungicide-induced expression of both <i>CYP51</i> genes. We hypothesize that the downregulation of DMI fungicide-induced expression of the DMI target genes may, at least in part, explain the synergism observed in detached fruit assays.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2064-2070"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141296625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-10DOI: 10.1094/PHYTO-10-23-0394-KC
Chris Massman, Hannah M Rivedal, Seth J Dorman, K Christy Tanner, Chance Fredrickson, Todd N Temple, Scott Fisk, Laura Helgerson, Patrick M Hayes
{"title":"Yellow Dwarf Virus Resistance in Barley: Phenotyping, Remote Imagery, and Virus-Vector Characterization.","authors":"Chris Massman, Hannah M Rivedal, Seth J Dorman, K Christy Tanner, Chance Fredrickson, Todd N Temple, Scott Fisk, Laura Helgerson, Patrick M Hayes","doi":"10.1094/PHYTO-10-23-0394-KC","DOIUrl":"10.1094/PHYTO-10-23-0394-KC","url":null,"abstract":"<p><p>Yellow dwarf viruses (YDVs) spread by aphids are some of the most economically important barley (<i>Hordeum vulgare</i>) virus-vector complexes worldwide. Detection and control of these viruses are critical components in the production of barley, wheat, and numerous other grasses of agricultural importance. Genetic control of plant diseases is often preferable to chemical control to reduce the environmental and economic cost of foliar insecticides. Accordingly, the objectives of this work were to (i) screen a barley population for resistance to YDVs under natural infection using phenotypic assessment of disease symptoms, (ii) implement drone imagery to further assess resistance and test its utility as a disease screening tool, (iii) identify the prevailing virus and vector types in the experimental environment, and (iv) perform a genome-wide association study to identify genomic regions associated with measured traits. Significant genetic differences were found in a population of 192 barley inbred lines regarding their YDV symptom severity, and symptoms were moderately to highly correlated with grain yield. The YDV severity measured with aerial imaging was highly correlated with on-the-ground estimates (<i>r</i> = 0.65). Three aphid species vectoring three YDV species were identified with no apparent genotypic influence on their distribution. A quantitative trait locus impacting YDV resistance was detected on chromosome 2H, albeit undetected using aerial imaging. However, quantitative trait loci for canopy cover and mean normalized difference vegetation index were successfully mapped using the drone. This work provides a framework for utilizing drone imagery in future resistance breeding efforts for YDVs in cereals and grasses, as well as in other virus-vector disease complexes.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2084-2095"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141446870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-16DOI: 10.1094/PHYTO-08-23-0270-R
Chauncy Hinshaw, Margarita M López-Uribe, Cristina Rosa
{"title":"Plant Virus Impacts on Yield and Plant-Pollinator Interactions Are Phylogenetically Modulated Independently of Domestication in <i>Cucurbita</i> spp.","authors":"Chauncy Hinshaw, Margarita M López-Uribe, Cristina Rosa","doi":"10.1094/PHYTO-08-23-0270-R","DOIUrl":"10.1094/PHYTO-08-23-0270-R","url":null,"abstract":"<p><p>Plant defenses are conserved among closely related species, but domestication can alter host genotypes through artificial selection with potential losses in host defenses. Therefore, both domestication and host phylogenetic structure may influence plant virus infection outcomes. Here, we examined the association of phylogeny and domestication with the fitness of infected plants. We inoculated three pairs of domesticated and wild/noncultivated squash (<i>Cucurbita</i> spp.) with a combination of two viruses commonly found to coinfect cucurbits, zucchini yellow mosaic virus and squash mosaic virus, and recorded fitness traits related to flowers, pollination, fruit, and seed viability in the field over 2 separate years. In an additional field experiment, we recorded the relative abundance of both viruses via RT-qPCR. We found a gradient of susceptibility across the six tested lineages, and phylogenetic structure, but not domestication, contributed to differences in infection outcomes and impacts on several fitness traits, including fruit number, fruit weight, and germination. Plant virus infection also impacted the quantity and quality of floral rewards and visitation rates of specialist bee pollinators. There were no detectable differences in viral load between the six host taxa for either virus individually or the ratio of zucchini yellow mosaic virus to squash mosaic virus. Our results highlight the importance of phylogenetic structure in predicting host susceptibility to disease across wild and domesticated plants and the ability of several hosts to maintain fitness in the field despite infection. Broader consequences of plant pathogens for beneficial insects, such as pollinators, should also be considered in future research.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2182-2191"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141262682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-23DOI: 10.1094/PHYTO-01-24-0013-R
Yuliang Yun, Qiong Yu, Zhaolei Yang, Xueke An, Dehao Li, Jinglong Huang, Dashuai Zheng, Qiang Feng, Dexin Ma
{"title":"Research on a Method for Identification of Peanut Pests and Diseases Based on a Lightweight LSCDNet Model.","authors":"Yuliang Yun, Qiong Yu, Zhaolei Yang, Xueke An, Dehao Li, Jinglong Huang, Dashuai Zheng, Qiang Feng, Dexin Ma","doi":"10.1094/PHYTO-01-24-0013-R","DOIUrl":"10.1094/PHYTO-01-24-0013-R","url":null,"abstract":"<p><p>Timely and accurate identification of peanut pests and diseases, coupled with effective countermeasures, is pivotal for ensuring high-quality and efficient peanut production. Despite the prevalence of pests and diseases in peanut cultivation, challenges such as minute disease spots, the elusive nature of pests, and intricate environmental conditions often lead to diminished identification accuracy and efficiency. Moreover, continuous monitoring of peanut health in real-world agricultural settings demands solutions that are computationally efficient. Traditional deep learning models often require substantial computational resources, limiting their practical applicability. In response to these challenges, we introduce LSCDNet (Lightweight Sandglass and Coordinate Attention Network), a streamlined model derived from DenseNet. LSCDNet preserves only the transition layers to reduce feature map dimensionality, simplifying the model's complexity. The inclusion of a sandglass block bolsters features extraction capabilities, mitigating potential information loss due to dimensionality reduction. Additionally, the incorporation of coordinate attention addresses issues related to positional information loss during feature extraction. Experimental results showcase that LSCDNet achieved impressive metrics with accuracy, precision, recall, and Fl score of 96.67, 98.05, 95.56, and 96.79%, respectively, while maintaining a compact parameter count of merely 0.59 million. When compared with established models such as MobileNetV1, MobileNetV2, NASNetMobile, DenseNet-121, InceptionV3, and X-ception, LSCDNet outperformed with accuracy gains of 2.65, 4.87, 8.71, 5.04, 6.32, and 8.2%, respectively, accompanied by substantially fewer parameters. Lastly, we deployed the LSCDNet model on Raspberry Pi for practical testing and application and achieved an average recognition accuracy of 85.36%, thereby meeting real-world operational requirements.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2162-2175"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141173813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"<i>Rmg10</i>, a Novel Wheat Blast Resistance Gene Derived from <i>Aegilops tauschii</i>.","authors":"Motohiro Yoshioka, Masahiro Kishii, Pawan Kumar Singh, Yoshihiro Inoue, Trinh Thi Phuong Vy, Yukio Tosa, Soichiro Asuke","doi":"10.1094/PHYTO-01-24-0018-R","DOIUrl":"10.1094/PHYTO-01-24-0018-R","url":null,"abstract":"<p><p>Wheat blast, caused by <i>Pyricularia oryzae</i> (syn. <i>Magnaporthe oryzae</i>) pathotype <i>Triticum</i> (MoT), is a devastating disease that can result in up to 100% yield loss in affected fields. To find new resistance genes against wheat blast, we screened 199 accessions of <i>Aegilops tauschii</i>, the D genome progenitor of common wheat (<i>Triticum aestivum</i>), by seedling inoculation assays with Brazilian MoT isolate Br48 and found 14 resistant accessions. A synthetic hexaploid wheat line (Ldn/KU-2097) derived from a cross between the <i>T. turgidum</i> 'Langdon' (Ldn) and resistant <i>A. tauschii</i> accession KU-2097 exhibited resistance in seedlings and spikes against Br48. In an F<sub>2</sub> population derived from 'Chinese Spring' × Ldn/KU-2097, resistant and susceptible individuals segregated in a 3:1 ratio, suggesting that the resistance from KU-2097 is controlled by a single dominant gene. We designated this gene <i>Rmg10</i>. Genetic mapping using an F<sub>2:3</sub> population from the same cross mapped the <i>RMG10</i> locus to the short arm of chromosome 2D. <i>Rmg10</i> was ineffective against Bangladesh isolates but effective against Brazilian isolates. Field tests in Bolivia showed increased spike resistance in a synthetic octaploid wheat line produced from a cross between common wheat cultivar 'Gladius' and KU-2097. These results suggest that <i>Rmg10</i> would be beneficial in farmers' fields in South America.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2113-2120"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141318126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-17DOI: 10.1094/PHYTO-03-24-0080-R
Abeer Alnasrawi, Payal Sanadhya, Lei Zhang, Cynthia Gleason, Kallahan Minor, Devany Crippen, Fiona L Goggin
{"title":"The Effects of <i>Bacillus subtilis</i> Expressing a Plant Elicitor Peptide on Nematode Infection on Soybean.","authors":"Abeer Alnasrawi, Payal Sanadhya, Lei Zhang, Cynthia Gleason, Kallahan Minor, Devany Crippen, Fiona L Goggin","doi":"10.1094/PHYTO-03-24-0080-R","DOIUrl":"10.1094/PHYTO-03-24-0080-R","url":null,"abstract":"<p><p>There is a pressing need to develop alternative management strategies for the soybean cyst nematode (<i>Heterodera glycines</i>), the most costly pathogen to soybeans. Plant elicitor peptides (PEPs), which are produced by plants in response to stress and stimulate broad-spectrum disease resistance, were previously shown to reduce soybean cyst nematode infection on soybeans when applied as a seed treatment. Here, we introduce an alternative method to deliver PEPs to soybean using a common plant growth-promoting rhizobacterium, <i>Bacillus subtilis</i>, as a bacterial expression system. Similar to the empty vector control, <i>B. subtilis</i> engineered to express a PEP from soybean (GmPEP3) was able to colonize soybean roots and persisted on roots more than a month after treatment. Compared with water or the empty vector control, plants that received a seed treatment with <i>B. subtilis</i> expressing GmPEP3 (B.+GmPEP3) were significantly taller early in vegetative growth (V1 stage) and had lower chlorophyll content in the reproductive stage (R3/R4); these results suggest that GmPEP3 may hasten growth and subsequent senescence. When plants were inoculated with soybean cyst nematode at the V1 stage, those pretreated with B.+GmPEP3 supported significantly fewer nematode eggs at the reproductive stage (R3/R4) than plants treated with water or the empty vector. The effects of B.+GmPEP3 on nematode infection and plant growth appeared to be due primarily to the peptide itself because no significant differences were observed between plants treated with water or with <i>B. subtilis</i> expressing the empty vector. These results indicate the ability of <i>B. subtilis</i> to deliver defense activators for nematode management on soybean.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2143-2150"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141238199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-13DOI: 10.1094/PHYTO-01-24-0019-R
Natalia Moroz, Benjamin Colvin, Samodya Jayasinghe, Cynthia Gleason, Kiwamu Tanaka
{"title":"Phytocytokine StPep1-Secreting Bacteria Suppress Potato Powdery Scab Disease.","authors":"Natalia Moroz, Benjamin Colvin, Samodya Jayasinghe, Cynthia Gleason, Kiwamu Tanaka","doi":"10.1094/PHYTO-01-24-0019-R","DOIUrl":"10.1094/PHYTO-01-24-0019-R","url":null,"abstract":"<p><p>Powdery scab is an important potato disease caused by the soilborne pathogen <i>Spongospora subterranea</i> f. sp. <i>subterranea</i>. Currently, reliable chemical control and resistant cultivars for powdery scab are unavailable. As an alternative control strategy, we propose a novel approach involving the effective delivery of a phytocytokine to plant roots by the rhizobacterium <i>Bacillus subtilis</i>. The modified strain is designed to secrete the plant elicitor peptide StPep1. In our experiments employing a hairy root system, we observed a significant reduction in powdery scab pathogen infection when we directly applied the StPep1 peptide. Furthermore, our pot assay, which involved pretreating potato roots with StPep1-secreting <i>B. subtilis</i>, demonstrated a substantial decrease in disease symptoms, including reduced root galling and fewer tuber lesions. These findings underscore the potential of engineered bacteria as a promising strategy for safeguarding plants against powdery scab.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2055-2063"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-10DOI: 10.1094/PHYTO-01-24-0005-R
Deanna L Funnell-Harris, Scott E Sattler, Ruth Dill-Macky, Stephen N Wegulo, Zachary T Duray, Patrick M O'Neill, Tammy Gries, Steven D Masterson, Robert A Graybosch, Robert B Mitchell
{"title":"Responses of Wheat (<i>Triticum aestivum</i>) Constitutively Expressing Four Different Monolignol Biosynthetic Genes to Fusarium Head Blight Caused by <i>Fusarium graminearum</i>.","authors":"Deanna L Funnell-Harris, Scott E Sattler, Ruth Dill-Macky, Stephen N Wegulo, Zachary T Duray, Patrick M O'Neill, Tammy Gries, Steven D Masterson, Robert A Graybosch, Robert B Mitchell","doi":"10.1094/PHYTO-01-24-0005-R","DOIUrl":"10.1094/PHYTO-01-24-0005-R","url":null,"abstract":"<p><p>The Fusarium head blight (FHB) pathogen <i>Fusarium graminearum</i> produces the trichothecene mycotoxin deoxynivalenol and reduces wheat yield and grain quality. Spring wheat (<i>Triticum aestivum</i>) genotype CB037 was transformed with constitutive expression (CE) constructs containing sorghum (<i>Sorghum bicolor</i>) genes encoding monolignol biosynthetic enzymes caffeoyl coenzyme A (CoA) 3-<i>O</i>-methyltransferase (<i>SbCCoAOMT</i>), 4-coumarate-CoA ligase (<i>Sb4CL</i>), or coumaroyl shikimate 3-hydroxylase (<i>SbC3'H</i>) or monolignol pathway transcriptional activator <i>SbMyb60</i>. Spring wheats were screened for type I (resistance to initial infection, using spray inoculations) and type II (resistance to spread within the spike, using single-floret inoculations) resistances in the field (spray) and greenhouse (spray and single floret). Following field inoculations, disease index, percentage of <i>Fusarium</i>-damaged kernels (FDK), and deoxynivalenol measurements of CE plants were similar to or greater than those of CB037. For greenhouse inoculations, the area under the disease progress curve (AUDPC) and FDK were determined. Following screens, focus was placed on two each of <i>SbC3'H</i> and <i>SbCCoAOMT</i> CE lines because of trends toward a decreased AUDPC and FDK observed following single-floret inoculations. These four lines were as susceptible as CB037 following spray inoculations. However, single-floret inoculations showed that these CE lines had a significantly reduced AUDPC (<i>P</i> < 0.01) and FDK (<i>P</i> ≤ 0.02) compared with CB037, indicating improved type II resistance. None of these CE lines had increased acid detergent lignin compared with CB037, indicating that lignin concentration may not be a major factor in FHB resistance. The <i>SbC3'H</i> and <i>SbCCoAOMT</i> CE lines are valuable for investigating phenylpropanoid-based resistance to FHB.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2096-2112"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141321447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-17DOI: 10.1094/PHYTO-04-24-0141-SC
Rekha Rana, Prabhu B Patil
{"title":"<i>Xanthomonas sontii</i>, and Not <i>X. sacchari</i>, Is the Predominant Vertically Transmitted Core Rice Seed Endophyte.","authors":"Rekha Rana, Prabhu B Patil","doi":"10.1094/PHYTO-04-24-0141-SC","DOIUrl":"10.1094/PHYTO-04-24-0141-SC","url":null,"abstract":"<p><p>Seed endophytes, particularly the abundant, core, and vertically transmitted species, are major areas of focus in host microbiome studies. Apart from being the first members to colonize, they accompany the plant throughout its development stages and to the next generation. Recently published studies have reported the keystone species to be <i>Xanthomonas sacchari</i>, a core endophyte that is vertically transmitted in rice with probiotic properties. Furthermore, the <i>Xanthomonas</i> species was reported to be involved in the assembly of beneficial bacteria after early inoculation in rice seeds. However, the strains discussed in these studies were misclassified as <i>X. sacchari</i>, a well-known pathogen of sugarcane. By including nonpathogenic <i>Xanthomonas</i> species with plant-protective functions reported from rice seeds, we have correctly established the phylogenetic and taxonomic identity of the keystone species as <i>X. sontii</i>. This will enable researchers to use the correct reference or lab strain of <i>X. sontii</i> for further systematic and in-depth studies as a model endophyte in plant-microbe interactions apart from its exploitation in seed health.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2017-2023"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141451261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PhytopathologyPub Date : 2024-09-01Epub Date: 2024-09-16DOI: 10.1094/PHYTO-11-23-0449-R
Apekshya Parajuli, Aastha Subedi, Sujan Timilsina, Gerald V Minsavage, Lawrence Kenyon, Jaw-Rong Chen, Erica M Goss, Mathews L Paret, Jeffrey B Jones
{"title":"Phenotypic and Genetic Diversity of Xanthomonads Isolated from Pepper (<i>Capsicum</i> spp.) in Taiwan from 1989 to 2019.","authors":"Apekshya Parajuli, Aastha Subedi, Sujan Timilsina, Gerald V Minsavage, Lawrence Kenyon, Jaw-Rong Chen, Erica M Goss, Mathews L Paret, Jeffrey B Jones","doi":"10.1094/PHYTO-11-23-0449-R","DOIUrl":"10.1094/PHYTO-11-23-0449-R","url":null,"abstract":"<p><p>Bacterial spot caused by <i>Xanthomonas</i> spp. is an economically important disease of pepper causing significant yield losses in Taiwan. Monitoring the pathogen population on a continuous basis is necessary for developing disease management strategies. We analyzed a collection of xanthomonad strains isolated from pepper in Taiwan between 1989 and 2019. Among the sequenced genomes, 65 were identified as <i>Xanthomonas euvesicatoria</i>, and 10 were <i>X. perforans</i>. Thirty-five <i>X. euvesicatoria</i> and 10 <i>X. perforans</i> strains were copper tolerant, whereas only four <i>X. euvesicatoria</i> and none of the <i>X. perforans</i> strains were tolerant to streptomycin. Nine <i>X. euvesicatoria</i> strains were amylolytic, which is considered an unusual characteristic for <i>X. euvesicatoria</i>. Bayesian analysis of the population structure based on core gene single-nucleotide polymorphisms clustered the strains into five clusters for <i>X. euvesicatoria</i> and three clusters for <i>X. perforans</i>. One <i>X. perforans</i> cluster, designated as TP-2019, appears to be a novel genetic cluster based on core genes, accessory gene content, and effector profile. This knowledge of pathogen diversity with whole genomic information will be useful in future comparative studies and in improving breeding programs to develop disease-resistant cultivars and other disease management options.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2033-2044"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141176239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}