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Herbicide 2,4-dichlorophenoxyacetic acid interferes with MAP kinase signaling in Fusarium graminearum and is inhibitory to fungal growth and pathogenesis

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Stress Biology 2023年第1期3卷 345-361页

作者： Kaili Duan Qifang Shen Yu Wang Ping Xiang Yutong Shi Chenfei Yang Cong Jiang Guanghui Wang Jin-Rong Xu Xue Zhang State Key Laboratory of Crop Stress Biology for Arid Areas College of Plant ProtectionNorthwest A&F UniversityYangling 712100ShaanxiChina Department of Botany and Plant Pathology Purdue UniversityWest LafayetteIN 47907USA

Plant hormones are important for regulating growth,development,and plant-pathogen *** of them are inhibitory to growth of fungal pathogens but the underlying mechanism is not *** this study,we found that hyphal growth of Fusarium graminearum was significantly reduced by high concentrations of IAA and its metabolically stable analogue 2,4-dichlorophenoxyacetic acid(2,4-D).Besides inhibitory effects on growth rate,treatments with 2,4-D also caused significant reduction in conidiation,conidium germination,and germ tube *** with 2,4-D had no obvious effect on sexual reproduction but significantly reduced TRI gene expression,toxisome formation,and DON *** importantly,treatments with 2,4-D were inhibitory to infection structure formation and pathogenesis at concentrations higher than 100μ*** presence of 1000μM 2,4-D almost completely inhibited plant infection and invasive *** ***,2,4-D induced ROS accumulation and FgHog1 activation but reduced the phosphorylation level of Gpmk1 MAP *** analysis showed that the accumulation of a number of metabolites such as glycerol and arabitol was increased by 2,4-D treatment in the wild type but not in the Fghog1 *** expressing the dominant active FgPBS2^(S451D T455D) allele were less sensitive to 2,4-D and had elevated levels of intracellular glycerol and arabitol induced by 2,4-D in *** together,our results showed that treatments with 2,4-D interfere with two important MAP kinase pathways and are inhibitory to hyphal growth,DON biosynthesis,and plant infection in ***.

关键词： fungal pathogenesis MAP kinase pathways 2,4-D,Fusarium graminearum

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Proteomics analysis of the phytopathogenic fungus Sclerotinia sclerotiorum:a narrative review

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Journal of Bio-X Research 2022年第3期5卷 112-117页

作者： Oluwatobi Sarah Otun Ikechukwu Achilonu Khayalethu Ntushelo Department of Molecular and Cell Biology University of Witwatersrand Department of Agriculture and Animal Health Science CampusUniversity of South AfricaJohannesburgSouth Africa

Sclerotinia sclerotiorum(Lib.)de Bary is a necrotrophic plant pathogen that causes cottony rot,watery soft rot,stem rot,white mold,and other disease symptoms in over 700 plant hosts around the *** of economically important crops,the lack of resistant cultivars,and the general challenge of controlling diseases caused by this broad-based pathogen call for continued ***,in recent years,mass spectrometry-based proteomics analyses have been used to acquire a fundamental and in-depth molecular understanding of this fungal *** this review,we describe the characteristics of the Sclerotinia sclerotiorum pathogen and examine its virulence factors,secreted proteins,and host suppression ***,we review recent proteomics studies and extrapolate their primary findings for the identification and functional characterization of Sclerotinia sclerotiorum ***,we discuss key findings that shape the understanding of the virulent factors and pathogenesis of Sclerotinia sclerotiorum and outline directions for future proteomic investigations of plant pathogens.

关键词： fungal pathogenesis mass spectrometry-based proteomics plant pathogen Sclerotinia sclerotiorum virulent proteins

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Analysis of Transcriptome Changes Induced by Ptr ToxA in Wheat Provides Insights into the Mechanisms of Plant Susceptibility

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Molecular Plant 2009年第5期2卷 1067-1083页

作者： Iovanna Pandelova Melania F. Betts Viola A. Manning Larry J. Wilhelm Todd C. Mockler Lynda M. Ciuffetti Department of Botany and Plant Pathology and Center for Genome Research and Biocomputing Oregon State University Corvallis OR 97331 USA

To obtain greater insight into the molecular events underlying plant disease susceptibility, we studied transcriptome changes induced by a host-selective toxin of Pyrenophora tritici-repentis, Ptr ToxA （ToxA）, on its host plant, wheat. Transcriptional profiling of ToxA-treated leaves of a ToxA-sensitive wheat cultivar was performed using the GeneChip Wheat Genome Array. An improved and up-to-date annotation of the wheat microarray was generated and a new tool for array data analysis （BRAT） was developed, and both are available for public use via a web-based interface. Our data indicate that massive transcriptional reprogramming occurs due to ToxA treatment, including cellular responses typically associated with defense. In addition, this study supports previous results indicating that ToxA-induced cell death is triggered by impairment of the photosynthetic machinery and accumulation of reactive oxygen species. Based on results of this study, we propose that ToxA acts as both an elicitor and a virulence factor.

关键词： Gene expression transcriptome analysis defense responses fungal pathogenesis plant-microbe interactions host-selective toxin.

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