PhytopathologyPub Date : 2024-10-01Epub Date: 2024-09-13DOI: 10.1094/PHYTO-11-23-0443-R
Stephen C Boushell, Mengjun Hu
{"title":"Validation of Fungicide Spray Strategies and Selection for Fenhexamid Resistance in <i>Botrytis cinerea</i> on Greenhouse-Grown Grapevines.","authors":"Stephen C Boushell, Mengjun Hu","doi":"10.1094/PHYTO-11-23-0443-R","DOIUrl":"10.1094/PHYTO-11-23-0443-R","url":null,"abstract":"<p><p>In this study, in planta assays were conducted to assess the effects of fungicide spray tactics, such as the reduction of the labeled fungicide dose and mixture with a multisite fungicide, on fungicide resistance selection and disease control using <i>Vitis vinifera</i> 'Cabernet Sauvignon' grown in a greenhouse for 2 years. The entire clusters were inoculated with <i>Botrytis cinerea</i> isolates at varying frequencies of fenhexamid resistance, followed by fungicide sprays and disease and fenhexamid resistance investigations at critical phenological stages. Our findings indicate that the lower dose of the at-risk fungicide, fenhexamid, effectively managed fenhexamid resistance and disease as well as the higher, labeled dose. In addition, a mixture with the multisite fungicide captan generally resulted a net-positive effect on both resistance management and disease control.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2244-2251"},"PeriodicalIF":2.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545200","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":"Effects of Different Light Conditions on Anatomical and Histological Features of Galls in Bacterial Gall Disease of <i>Cerasus</i> × <i>yedoensis</i>.","authors":"Takefumi Ikeda, Misaki Okuda, Makoto Ishihara, Yasuo Kon-No","doi":"10.1094/PHYTO-06-22-0221-R","DOIUrl":"10.1094/PHYTO-06-22-0221-R","url":null,"abstract":"<p><p><i>Cerasus</i> × <i>yedoensis</i> (cherry 'Somei-yoshino' Fujino) is affected by bacterial gall disease caused by <i>Pseudomonas syringae</i> pv. <i>cerasicola</i> (PSC). <i>C.</i> × <i>yedoensis</i> is often infected with PSC under weak light intensity, which indicates that susceptibility of <i>C.</i> × <i>yedoensis</i> to PSC is affected by light. To evaluate the effects of white light intensity and different light qualities, white or blue, on bacterial gall disease development, we quantitatively assessed the anatomical and histological features of bacterial-inoculated sites on branches of 2-year-old potted <i>C</i>. × <i>yedoensis</i> seedlings grown under different light intensities and qualities. The stronger the white light intensity, the less severe the gall symptoms. Gall formation was suppressed more by blue than white light of the same intensity. The validity of a simple gall index for assessing gall development with the naked eye, via quantitative evaluation of gall shape by measuring gall height, width, and volume, showed that the gall index could be used as a practical method for on-site assessments of gall development. The ratio of degeneration area in the gall remained constant, suggesting the presence of some regulatory mechanism preventing PSC from affecting the entire gall within the plant. Microscopy showed that the gall tissue is composed primarily of callus cells and has voids containing gummy material that is exuded from cracks in the gall, and the periderm develops at the gall foot but not at the gall apex, so the cells at the gall apex were necrotic or collapsed.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2196-2206"},"PeriodicalIF":2.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141793095","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 : 2024-10-01Epub Date: 2024-10-16DOI: 10.1094/PHYTO-04-24-0147-R
Yao Xiao, Shatrupa Ray, Saul Burdman, Doron Teper
{"title":"Host-Driven Selection, Revealed by Comparative Analysis of <i>Xanthomonas</i> Type III Secretion Effectoromes, Unveils Novel Recognized Effectors.","authors":"Yao Xiao, Shatrupa Ray, Saul Burdman, Doron Teper","doi":"10.1094/PHYTO-04-24-0147-R","DOIUrl":"10.1094/PHYTO-04-24-0147-R","url":null,"abstract":"<p><p><i>Xanthomonas</i> species are specialized plant pathogens, often exhibiting a narrow host range. They rely on the translocation of effector proteins through the type III secretion system to colonize their respective hosts. The effector arsenal varies among <i>Xanthomonas</i> spp., typically displaying species-specific compositions. This species-specific effector composition, collectively termed the effectorome, is thought to influence host specialization. We determined the plant host-derived effectoromes of more than 300 deposited genomes of <i>Xanthomonas</i> species associated with either <i>Solanaceae</i> or <i>Brassicaceae</i> hosts. Comparative analyses revealed clear species-specific effectorome signatures. However, <i>Solanaceae</i> or <i>Brassicaceae</i> host-associated effectorome signatures were not detected. Nevertheless, host biases in the presence or absence of specific effector classes were observed. To assess whether host-associated effector absence results from selective pressures, we introduced effectors unique to <i>Solanaceae</i> pathogens to <i>X. campestris</i> pv. <i>campestris</i> and effectors unique to <i>Brassicaceae</i> pathogens to <i>X. euvesicatoria</i> pv. <i>euvesicatoria</i> (Xeue) and evaluated if these introductions hindered virulence on their respective hosts. Introducing the effector XopI into <i>X. campestris</i> pv. <i>campestris</i> reduced virulence on white cabbage leaves without affecting localized or systemic colonization. Introducing the XopAC or XopJ5 effectors into Xeue reduced virulence and colonization on tomato but not on pepper. Additionally, XopAC and XopJ5 induced a hypersensitive response on tomato leaves when delivered by Xeue or through <i>Agrobacterium</i>-mediated transient expression, confirming recognition in tomato. This study demonstrates the role of host-derived selection in establishing species-specific effectoromes, identifying XopAC and XopJ5 as recognized effectors in tomato.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2207-2220"},"PeriodicalIF":2.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141971650","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 : 2024-10-01Epub Date: 2024-10-04DOI: 10.1094/PHYTO-01-24-0017-R
Lifang Ye, Weigang Kuang, Lianhu Zhang, Yachun Lin, Yifan Zhang, Xiaotang Sun, Ruqiang Cui
{"title":"Functional Characterization of the Histone Acetyltransferase <i>FcElp3</i> in Lotus Rhizome Rot-Causing Fungus <i>Fusarium commune</i>.","authors":"Lifang Ye, Weigang Kuang, Lianhu Zhang, Yachun Lin, Yifan Zhang, Xiaotang Sun, Ruqiang Cui","doi":"10.1094/PHYTO-01-24-0017-R","DOIUrl":"10.1094/PHYTO-01-24-0017-R","url":null,"abstract":"<p><p><i>Fusarium commune</i> is the main pathogen of lotus rhizome rot, which causes the wilt of many plants. Histone acetyltransferase plays a critical part in the growth and virulence of fungi. In the present study, we identified an FcElp3 in <i>F. commune</i> homologous to histone acetyltransferase Elp3. We further constructed a mutant strain of <i>F. commune</i> to determine the function of FcElp3 in fungal growth and pathogenicity. The results showed that the deletion of FcElp3 resulted in reduced mycelial growth and sporulation. Compared with the wild type, the Δ<i>FcElp3</i> strain showed more tolerance to osmotic stress and cell wall stress responses but was highly sensitive to oxidative stress. The subcellular localization results indicated that FcElp3 was distributed in both the cytoplasm and nucleus. Western blotting showed that FcElp3 was important for acetylation of H3K14 and H4K8. RNA sequencing analysis showed significant transcriptional changes in the Δ<i>FcElp3</i> mutant, with 3,098 genes upregulated and 5,770 genes downregulated. Peroxisome was the most significantly enriched metabolic pathway for downregulated genes. This led to a significant decrease in the expression of the core transcription factor <i>Fcap1</i> involved in the oxidative stress response. Pathogenicity tests revealed that the Δ<i>FcElp3</i> mutant's pathogenicity on lotus was significantly decreased. Together, these findings clearly demonstrated that <i>FcElp3</i> was involved in fungal growth, development, stress response, and pathogenicity via the direct regulation of multiple target genes.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":"2300-2309"},"PeriodicalIF":2.6,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141617064","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 : 2024-09-30DOI: 10.1094/PHYTO-10-23-0391-KC
Liuliu Yang, Yu Sun, Lin Sun, Zehao Wang, Jie Feng, Yue Liang
{"title":"Application of loop-mediated isothermal amplification (LAMP) in plant pathogen detection.","authors":"Liuliu Yang, Yu Sun, Lin Sun, Zehao Wang, Jie Feng, Yue Liang","doi":"10.1094/PHYTO-10-23-0391-KC","DOIUrl":"https://doi.org/10.1094/PHYTO-10-23-0391-KC","url":null,"abstract":"<p><p>Plant diseases impact the production of all kinds of crops, resulting in significant economic losses worldwide. Timely and accurate detection of plant pathogens is crucial for surveillance and management of plant diseases. In recent years, loop-mediated isothermal amplification (LAMP) has become a popular method for pathogen detection and disease diagnosis due to the advantages of its simple instrument requirement and constant reaction temperature. In this review, we provide an overview of current research on LAMP, including the reaction system, design of primers, selection of target regions, visualization of amplicons, and application of LAMP on the detection of all major groups of plant pathogens. We also discuss plant pathogens for which LAMP is yet to be developed, potential improvements of plant disease diagnosis, and disadvantages that need to be considered.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142352511","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 : 2024-09-30DOI: 10.1094/PHYTO-05-24-0162-R
Stephen Muhindi, Wendy Zellner, Shin-Yi Marzano, Jennifer Boldt, Scott Leisner
{"title":"Transient Expression of <i>Nicotiana tabacum</i> Silicon-Induced Histidine-Rich Defensins in <i>Nicotiana benthamiana</i> Limits Necrotic Lesion Development Caused by Phytopathogenic Fungi.","authors":"Stephen Muhindi, Wendy Zellner, Shin-Yi Marzano, Jennifer Boldt, Scott Leisner","doi":"10.1094/PHYTO-05-24-0162-R","DOIUrl":"https://doi.org/10.1094/PHYTO-05-24-0162-R","url":null,"abstract":"<p><p>Silicon (Si) supplementation permits plants to better deter infection. Supplementing hydroponically-propagated <i>Nicotiana tabacum</i> with 1 mM potassium silicate (K<sub>2</sub>SiO<sub>3</sub>) reduced necrotic lesion development on detached leaves by both <i>Botrytis cinerea</i> and <i>Sclerotinia sclerotiorum</i>. Previously, a family of Si-induced genes was identified in <i>N. tabacum</i>. These genes were members of the Solanaceous <i>Histidine-Rich Defensin</i> (HRD) superfamily and were termed NtHRD1s (the first identified family of <i>Nicotiana tabacum</i> Histidine-Rich Defensins). Defensins were originally identified to participate in innate immunity. Thus, the NtHRD1s were tested for antimicrobial effects on plant pathogens. Transient expression of <i>NtHRD1</i> genes within <i>Nicotiana benthamiana</i> leaves restricted the development of necrotic lesions caused by <i>B. cinerea</i> and <i>S. sclerotiorum</i>. Thus, the NtHRD1s may be an additional Si-responsive factor conferring beneficial effects on plants.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142352513","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 : 2024-09-25DOI: 10.1094/PHYTO-04-24-0129-R
Jun-Jun Liu, Richard A Sniezko, Sydney Houston, Genoa Alger, Jodie Krakowski, Anna W Schoettle, Robert Sissons, Arezoo Zamany, Holly Williams, Benjamin Rancourt, Angelia Kegley
{"title":"A New Threat to Limber Pine (<i>Pinus flexilis</i>) Restoration in Alberta and Beyond: First Documentation of a <i>Cronartium ribicola</i> race (<i>vcr4</i>) Virulent to <i>Cr4</i>-Controlled Major Gene Resistance.","authors":"Jun-Jun Liu, Richard A Sniezko, Sydney Houston, Genoa Alger, Jodie Krakowski, Anna W Schoettle, Robert Sissons, Arezoo Zamany, Holly Williams, Benjamin Rancourt, Angelia Kegley","doi":"10.1094/PHYTO-04-24-0129-R","DOIUrl":"https://doi.org/10.1094/PHYTO-04-24-0129-R","url":null,"abstract":"<p><p>The coevolution of virulence reduces the effectiveness of host resistance to pathogens, posing a direct threat to forest species and their key ecosystem functions. This exacerbates the threat to limber pine (<i>Pinus flexilis</i>), an endangered species in Canada due to rapid declines mainly driven by white pine blister rust (WPBR) as caused by <i>Cronartium ribicola</i>. We present the first report on a new <i>C. ribicola</i> virulent race (designated <i>vcr4</i>) that overcomes limber pine major gene (<i>Cr4</i>) resistance (MGR). Field surveys found that three parental trees (pf-503, pf-508 and pf-2015-0070) were cankered with WPBR in Alberta, but their progenies showed MGR-related phenotypic segregation post-inoculation of avirulent race (<i>Avcr4</i>). Genotyping of their progenies using <i>Cr4</i>-linked DNA markers and genome-wide association study (GWAS) provided additional support that these cankered parental trees had <i>Cr4</i>-controlled MGR. To confirm the presence of <i>vcr4</i>, aeciospores were collected from the cankered pf-503 tree to inoculate resistant seedlings that had survived prior inoculation using <i>Avcr4</i> race, as well as seedlings of two US seed parents, one previously confirmed with MGR (<i>Cr4</i>) and one non-MGR, respectively. All inoculated seedlings showed clear stem symptoms, confirming the virulent race is <i>vcr4</i>. These results provide insights into evolution of <i>C. ribicola</i> virulence, and reinforces caution on deployment of <i>Cr4</i>-controlled MGR. The information will be useful for designing a breeding program for durable resistance by layering both R genes with quantitative trait loci (QTLs) for resistance to WPBR in North America.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142352510","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 : 2024-09-25DOI: 10.1094/PHYTO-05-24-0154-R
WenWen Li, FeiFei Liu, ShuaiFei Chen, Michael J Wingfield, Tuan A Duong
{"title":"High genetic diversity and limited regional population differentiation in populations of <i>Calonectria pseudoreteaudii</i> from <i>Eucalyptus</i> plantations.","authors":"WenWen Li, FeiFei Liu, ShuaiFei Chen, Michael J Wingfield, Tuan A Duong","doi":"10.1094/PHYTO-05-24-0154-R","DOIUrl":"https://doi.org/10.1094/PHYTO-05-24-0154-R","url":null,"abstract":"<p><p><i>Calonectria pseudoreteaudii</i> causes a serious and widespread disease known as Calonectria leaf blight in <i>Eucalyptus</i> plantations of southern China. Little is known regarding the population biology or reproductive biology of this pathogen in the affected areas. The aims of this study were to investigate the genetic diversity, population structure and the reproductive mode of <i>C. pseudoreteaudii</i> from affected <i>Eucalyptus</i> plantations of southern China. Ten polymorphic SSR markers were developed for the species, and were used to genotype 311 isolates from eight populations. The mating types of all isolates were identified using the <i>MAT</i> gene primers. The results revealed a high level of genetic diversity of the pathogen in all investigated populations. Of the 90 multilocus genotypes detected, ten were shared between at least two populations. With the exception of one population from HuiZhou, GuangDong (7HZ), the most dominant genotype was shared in seven remaining populations. DAPC and population differentiation analyses showed that the 7HZ population was well differentiated from the others and that there was no significant differentiation between the remaining populations. AMOVA suggested that most molecular variation was within populations (86%). Index of association analysis was consistent with a predominantly asexual life cycle for <i>C. pseudoreteaudii</i> in the studied regions. Although both mating types were detected in seven of the eight populations, the <i>MAT1-1</i>/<i>MAT1-2</i> ratios in these populations deviated significantly from the 1:1 ratio expected in a randomly mating population.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142352512","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":"Unraveling <i>Pinus massoniana</i>'s defense mechanisms against <i>Bursaphelenchus xylophilus</i> under aseptic conditions: A transcriptomic analysis.","authors":"Jinghui Zhu, Kean-Jin Lim, Tianyu Fang, Chen Zhang, Jianren Ye, Li-Hua Zhu","doi":"10.1094/PHYTO-06-24-0180-R","DOIUrl":"https://doi.org/10.1094/PHYTO-06-24-0180-R","url":null,"abstract":"<p><p>Pine wilt disease (PWD) is caused by pine wood nematode (PWN, <i>Bursaphelenchus xylophilus</i>) and significantly impacts pine forest ecosystems globally. This study focuses on <i>Pinus massoniana</i>, an important timber and oleoresin resource in China, and is highly susceptible to PWN. However, the defense mechanism of pine trees in response to PWN remains unclear. Addressing the complexities of PWD, influenced by diverse factors like bacteria, fungi, and environment, we established a reciprocal system between PWN and <i>P. massoniana</i> seedlings under aseptic conditions. Utilizing combined second and third-generation sequencing technologies, we identified 3,718 differentially expressed genes post-PWN infection. Transcript analysis highlighted the activation of defense mechanisms via stilbenes, salicylic acid and jasmonic acid pathways, terpene synthesis, and induction of pathogenesis-related proteins and resistance genes, predominantly at 72 hours post-infection. Notably, terpene synthesis pathways, particularly the mevalonate pathway, were crucial in defense, suggesting their significance in <i>P. massoniana</i>'s response to PWN. This comprehensive transcriptome profiling offers insights into <i>P. massoniana</i>'s intricate defense strategies against PWN under aseptic conditions laid a foundation for future functional analyses of key resistance genes.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142293751","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 : 2024-09-16DOI: 10.1094/PHYTO-02-24-0064-R
Md Musharaf Hossain, Edel Pérez López, Christopher D Todd, Yangdou Wei, Peta C Bonham-Smith
{"title":"<i>Plasmodiophora brassicae</i> effector PbPE23 induces necrotic responses in both host and non-host plants.","authors":"Md Musharaf Hossain, Edel Pérez López, Christopher D Todd, Yangdou Wei, Peta C Bonham-Smith","doi":"10.1094/PHYTO-02-24-0064-R","DOIUrl":"https://doi.org/10.1094/PHYTO-02-24-0064-R","url":null,"abstract":"<p><p><i>Plasmodiophora brassicae</i> is an obligate biotroph that causes clubroot disease in cruciferous plants, including canola and Arabidopsis. In contrast to most known bacterial, oomycete and fungal pathogens that colonize at the host apoplastic space, the protist <i>P. brassicae</i> establishes an intracellular colonization within various types of root cells and secretes a plethora of effector proteins to distinct cellular compartments favourable for survival and growth of the pathogen during pathogenesis. Identification and functional characterization of <i>P. brassicae</i> effectors has been hampered by the limited understanding of this unique pathosystem. Here, we report a <i>P. brassicae</i> effector, PbPE23, containing a Ser/Thr kinase domain, that induces necrosis after heterologous expression by leaf infiltration in both host and non-host plants. While PbPE23 is an active kinase, the kinase activity itself is not required for triggering the necrosis in plants. PbPE23 shows a nucleocytoplasmic localization in <i>Nicotiana benthamiana</i> and its N-terminal <sup>25</sup>TPdPAQKQ<sup>32</sup> sequence, resembling the contiguous hydrophilic TPAP motif and Q-rich region in many Nep1-like proteins (NLPs) from plant-associated microbes, is required for the induction of necrosis. Further, transcript profiling of <i>PbPE23</i> reveals its high expression at the transition stages from primary to secondary infection, suggesting its potential involvement in the development of clubroot disease.</p>","PeriodicalId":20410,"journal":{"name":"Phytopathology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142293749","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}