Defense response genes co-localize with quantitative disease resistance loci in pepper

2001 ◽  
Vol 103 (6-7) ◽  
pp. 920-929 ◽  
Author(s):  
S. Pflieger ◽  
A. Palloix ◽  
C. Caranta ◽  
A. Blattes ◽  
V. Lefebvre
Keyword(s):  
Disease Resistance ◽  
Defense Response ◽  
Quantitative Disease Resistance ◽  
Defense Response Genes

scholarly journals Expression polymorphism at theARPC4locus links the actin cytoskeleton with quantitative disease resistance toSclerotinia sclerotioruminArabidopsis thaliana

2018 ◽  
Vol 222 (1) ◽  
pp. 480-496 ◽  
Author(s):  
Thomas Badet ◽  
Ophélie Léger ◽  
Marielle Barascud ◽  
Derry Voisin ◽  
Pierre Sadon ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Actin Cytoskeleton ◽  
Quantitative Disease Resistance ◽  
Expression Polymorphism

BnaMPK6 is a determinant of quantitative disease resistance against Sclerotinia sclerotiorum in oilseed rape

Plant Science ◽  
2020 ◽  
Vol 291 ◽  
pp. 110362
Author(s):  
Zheng Wang ◽  
Feng-Yun Zhao ◽  
Min-Qiang Tang ◽  
Ting Chen ◽  
Ling-Li Bao ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Oilseed Rape ◽  
Sclerotinia Sclerotiorum ◽  
Quantitative Disease Resistance

scholarly journals Chitinase Gene Positively Regulates Hypersensitive and Defense Responses of Pepper to Colletotrichum acutatum Infection

2020 ◽  
Vol 21 (18) ◽  
pp. 6624 ◽  
Author(s):  
Muhammad Ali ◽  
Quan-Hui Li ◽  
Tao Zou ◽  
Ai-Min Wei ◽  
Ganbat Gombojab ◽  
...  
Keyword(s):  
Defense Response ◽  
Defense Responses ◽  
Chitinase Gene ◽  
Colletotrichum Acutatum ◽  
Basal Resistance ◽  
Chitin Binding Domain ◽  
Pepper Leaves ◽  
Defense Response Genes ◽  
Chitinase Genes ◽  
Pepper Plants

Anthracnose caused by Colletotrichum acutatum is one of the most devastating fungal diseases of pepper (Capsicum annuum L.). The utilization of chitin-binding proteins or chitinase genes is the best option to control this disease. A chitin-binding domain (CBD) has been shown to be crucial for the innate immunity of plants and activates the hypersensitive response (HR). The CaChiIII7 chitinase gene has been identified and isolated from pepper plants. CaChiIII7 has repeated CBDs that encode a chitinase enzyme that is transcriptionally stimulated by C. acutatum infection. The knockdown of CaChiIII7 in pepper plants confers increased hypersensitivity to C. acutatum, resulting in its proliferation in infected leaves and an attenuation of the defense response genes CaPR1, CaPR5, and SAR8.2 in the CaChiIII7-silenced pepper plants. Additionally, H2O2 accumulation, conductivity, proline biosynthesis, and root activity were distinctly reduced in CaChiIII7-silenced plants. Subcellular localization analyses indicated that the CaChiIII7 protein is located in the plasma membrane and cytoplasm of plant cells. The transient expression of CaChiIII7 increases the basal resistance to C. acutatum by significantly expressing several defense response genes and the HR in pepper leaves, accompanied by an induction of H2O2 biosynthesis. These findings demonstrate that CaChiIII7 plays a prominent role in plant defense in response to pathogen infection.

Systemic expression of defense response genes in wheat spikes as a response to Fusarium graminearum infection

2001 ◽  
Vol 58 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Clara Pritsch ◽  
Carroll P. Vance ◽  
William R. Bushnell ◽  
David A. Somers ◽  
Thomas M. Hohn ◽  
...  
Keyword(s):  
Fusarium Graminearum ◽  
Defense Response ◽  
Defense Response Genes

scholarly journals Robustness of plant quantitative disease resistance is provided by a decentralized immune network

2020 ◽  
Vol 117 (30) ◽  
pp. 18099-18109 ◽  
Author(s):  
Florent Delplace ◽  
Carine Huard-Chauveau ◽  
Ullrich Dubiella ◽  
Mehdi Khafif ◽  
Eva Alvarez ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Xanthomonas Campestris ◽  
Mutational Analysis ◽  
Molecular Networks ◽  
Integrative Approach ◽  
Immune Network ◽  
Functional Modules ◽  
Limited Information ◽  
Quantitative Disease Resistance ◽  
Gene Modules

Quantitative disease resistance (QDR) represents the predominant form of resistance in natural populations and crops. Surprisingly, very limited information exists on the biomolecular network of the signaling machineries underlying this form of plant immunity. This lack of information may result from its complex and quantitative nature. Here, we used an integrative approach including genomics, network reconstruction, and mutational analysis to identify and validate molecular networks that control QDR inArabidopsis thalianain response to the bacterial pathogenXanthomonas campestris. To tackle this challenge, we first performed a transcriptomic analysis focused on the early stages of infection and using transgenic lines deregulated for the expression ofRKS1, a gene underlying a QTL conferring quantitative and broad-spectrum resistance toX.campestris.RKS1-dependent gene expression was shown to involve multiple cellular activities (signaling, transport, and metabolism processes), mainly distinct from effector-triggered immunity (ETI) and pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) responses already characterized inA.thaliana. Protein–protein interaction network reconstitution then revealed a highly interconnected and distributed RKS1-dependent network, organized in five gene modules. Finally, knockout mutants for 41 genes belonging to the different functional modules of the network revealed that 76% of the genes and all gene modules participate partially in RKS1-mediated resistance. However, these functional modules exhibit differential robustness to genetic mutations, indicating that, within the decentralized structure of the QDR network, some modules are more resilient than others. In conclusion, our work sheds light on the complexity of QDR and provides comprehensive understanding of a QDR immune network.

scholarly journals A New Catalog of Structural Variants in 1,301 A. thaliana Lines from Africa, Eurasia, and North America Reveals a Signature of Balancing Selection at Defense Response Genes

2020 ◽  
Author(s):  
Mehmet Göktay ◽  
Andrea Fulgione ◽  
Angela M Hancock
Keyword(s):  
North America ◽  
Defense Response ◽  
Balancing Selection ◽  
Natural Populations ◽  
Housekeeping Genes ◽  
Intermediate Frequency ◽  
Genomic Variation ◽  
Nucleotide Polymorphisms ◽  
Structural Variants ◽  
Defense Response Genes

Abstract Genomic variation in the model plant Arabidopsis thaliana has been extensively used to understand evolutionary processes in natural populations, mainly focusing on single-nucleotide polymorphisms. Conversely, structural variation has been largely ignored in spite of its potential to dramatically affect phenotype. Here, we identify 155,440 indels and structural variants ranging in size from 1 bp to 10 kb, including presence/absence variants (PAVs), inversions, and tandem duplications in 1,301 A. thaliana natural accessions from Morocco, Madeira, Europe, Asia, and North America. We show evidence for strong purifying selection on PAVs in genes, in particular for housekeeping genes and homeobox genes, and we find that PAVs are concentrated in defense-related genes (R-genes, secondary metabolites) and F-box genes. This implies the presence of a “core” genome underlying basic cellular processes and a “flexible” genome that includes genes that may be important in spatially or temporally varying selection. Further, we find an excess of intermediate frequency PAVs in defense response genes in nearly all populations studied, consistent with a history of balancing selection on this class of genes. Finally, we find that PAVs in genes involved in the cold requirement for flowering (vernalization) and drought response are strongly associated with temperature at the sites of origin.

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