Subtopic Deep Dive
Oxalic Acid in Plant-Fungal Interactions
Research Guide
What is Oxalic Acid in Plant-Fungal Interactions?
Oxalic acid is a key pathogenicity factor secreted by necrotrophic fungi like Sclerotinia sclerotiorum that modulates host pH, chelates calcium, and suppresses plant oxidative bursts to promote infection.
Sclerotinia sclerotiorum relies on oxalic acid production for virulence, as shown by pac1 mutants lacking oxalate synthesis and exhibiting reduced pathogenicity (Rollins, 2003, 290 citations). This compound suppresses the host oxidative burst, enabling fungal colonization (Cessna et al., 2000, 552 citations). Over 10 papers from the list detail its roles in redox manipulation and defense evasion (Williams et al., 2011, 458 citations).
Why It Matters
Oxalic acid enables Sclerotinia sclerotiorum to infect over 400 crop species, causing billions in annual losses in soybeans, canola, and beans. Detoxification strategies, like germin enzymes, offer non-GMO resistance by neutralizing oxalate's pH modulation and calcium chelation (Cessna et al., 2000). Williams et al. (2011) showed oxalate manipulates host redox for necrosis, guiding targeted breeding. Rollins (2003) mutants confirm oxalate essentiality, supporting antifungal development.
Key Research Challenges
Oxalate Detoxification Mechanisms
Plants struggle to neutralize fungal oxalate without compromising calcium homeostasis. Germin-like proteins degrade oxalate but vary across crops (Cessna et al., 2000). Breeding for high-expression detoxifiers risks growth defects (Williams et al., 2011).
Redox Manipulation by OA
Oxalate alters host ROS balance to favor necrosis over defense. Fungal pac1 mutants restore plant oxidative bursts but retain partial virulence (Rollins, 2003). Quantifying redox shifts during infection remains technically challenging (Williams et al., 2011).
Host Range Virulence Factors
Sclerotinia uses oxalate synergistically with effectors across diverse hosts. Genomic analyses reveal conserved oxalate genes but variable regulation (Amselem et al., 2011, 1053 citations). Predicting host-specific virulence needs better effector-oxalate interaction maps (Guyon et al., 2014).
Essential Papers
Genomic Analysis of the Necrotrophic Fungal Pathogens Sclerotinia sclerotiorum and Botrytis cinerea
Joëlle Amselem, Christina A. Cuomo, J.A.L. van Kan et al. · 2011 · PLoS Genetics · 1.1K citations
Sclerotinia sclerotiorum and Botrytis cinerea are closely related necrotrophic plant pathogenic fungi notable for their wide host ranges and environmental persistence. These attributes have made th...
Oxalic Acid, a Pathogenicity Factor for <i>Sclerotinia sclerotiorum</i>, Suppresses the Oxidative Burst of the Host Plant
Stephen G. Cessna, Valerie E. Sears, Martin B. Dickman et al. · 2000 · The Plant Cell · 552 citations
Effective pathogenesis by the fungus Sclerotinia sclerotiorum requires the secretion of oxalic acid. Studies were conducted to determine whether oxalate aids pathogen compatibility by modulating th...
Tipping the Balance: Sclerotinia sclerotiorum Secreted Oxalic Acid Suppresses Host Defenses by Manipulating the Host Redox Environment
Brett Williams, Mehdi Kabbage, Hyo-Jin Kim et al. · 2011 · PLoS Pathogens · 458 citations
Sclerotinia sclerotiorum is a necrotrophic ascomycete fungus with an extremely broad host range. This pathogen produces the non-specific phytotoxin and key pathogenicity factor, oxalic acid (OA). O...
Disease Resistance Mechanisms in Plants
Ethan Andersen, Shaukat Ali, Emmanuel Byamukama et al. · 2018 · Genes · 426 citations
Plants have developed a complex defense system against diverse pests and pathogens. Once pathogens overcome mechanical barriers to infection, plant receptors initiate signaling pathways driving the...
The <i>Sclerotinia sclerotiorum pac1</i> Gene Is Required for Sclerotial Development and Virulence
Jeffrey A. Rollins · 2003 · Molecular Plant-Microbe Interactions · 290 citations
The synergistic activities of oxalic acid and endopolygalacturonases are thought to be essential for full virulence of Sclerotinia sclerotiorum and other oxalate-producing plant pathogens. Both oxa...
<i>Arabidopsis</i>RECEPTOR-LIKE PROTEIN30 and Receptor-Like Kinase SUPPRESSOR OF BIR1-1/EVERSHED Mediate Innate Immunity to Necrotrophic Fungi
Weiguo Zhang, Malou Fraiture, Dagmar Kolb et al. · 2013 · The Plant Cell · 284 citations
Abstract Effective plant defense strategies rely in part on the perception of non-self determinants, so-called microbe-associated molecular patterns (MAMPs), by transmembrane pattern recognition re...
Cell Death Control: The Interplay of Apoptosis and Autophagy in the Pathogenicity of Sclerotinia sclerotiorum
Mehdi Kabbage, Brett Williams, Martin B. Dickman · 2013 · PLoS Pathogens · 281 citations
Programmed cell death is characterized by a cascade of tightly controlled events that culminate in the orchestrated death of the cell. In multicellular organisms autophagy and apoptosis are recogni...
Reading Guide
Foundational Papers
Start with Cessna et al. (2000, 552 citations) for core oxidative burst suppression mechanism, then Rollins (2003, 290 citations) for pac1 mutant evidence of oxalate essentiality, followed by Amselem et al. (2011, 1053 citations) for genomic context.
Recent Advances
Study Williams et al. (2011, 458 citations) for redox environment manipulation; Guyon et al. (2014) for effector-oxalate synergies; Yang et al. (2017, 237 citations) for cerato-platanin contributions.
Core Methods
Oxalate quantification via HPLC; pac1 knockout mutagenesis; H2DCF-DA probes for ROS; germin overexpression for detoxification assays.
How PapersFlow Helps You Research Oxalic Acid in Plant-Fungal Interactions
Discover & Search
Research Agent uses searchPapers and citationGraph on 'oxalic acid Sclerotinia virulence' to map 1053-citation Amselem et al. (2011) as hub, revealing pac1 connections (Rollins, 2003). exaSearch uncovers oxalate redox papers; findSimilarPapers expands to Botrytis analogs.
Analyze & Verify
Analysis Agent applies readPaperContent to Cessna et al. (2000) for oxidative burst assays, then verifyResponse (CoVe) cross-checks claims against Williams et al. (2011). runPythonAnalysis plots oxalate concentration vs. ROS suppression from extracted data, with GRADE scoring evidence strength.
Synthesize & Write
Synthesis Agent detects gaps in oxalate detoxification across crops, flagging contradictions between Rollins (2003) mutants and wild-type virulence. Writing Agent uses latexEditText for methods sections, latexSyncCitations for 10-paper bibliographies, and exportMermaid for oxalate-pathway diagrams.
Use Cases
"Plot oxalate production vs. lesion size in Sclerotinia pac1 mutants from Rollins 2003."
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas/matplotlib on extracted tables) → matplotlib plot of concentration-lesion correlation.
"Write LaTeX review on oxalate suppression of plant oxidative burst citing Cessna 2000."
Synthesis Agent → gap detection → Writing Agent → latexEditText → latexSyncCitations (Cessna/Williams) → latexCompile → PDF with formatted equations.
"Find GitHub repos analyzing Sclerotinia oxalate genomics from Amselem 2011."
Research Agent → paperExtractUrls (Amselem) → Code Discovery → paperFindGithubRepo → githubRepoInspect → list of 5 analysis scripts for genomic data.
Automated Workflows
Deep Research workflow scans 50+ Sclerotinia papers via citationGraph from Amselem et al. (2011), producing structured oxalate virulence report with GRADE scores. DeepScan applies 7-step CoVe to verify Cessna et al. (2000) burst suppression claims against mutants (Rollins, 2003). Theorizer generates hypotheses on oxalate-effectors synergy from Guyon et al. (2014) secretome data.
Frequently Asked Questions
What defines oxalic acid's role in plant-fungal interactions?
Oxalic acid acts as a pathogenicity factor for Sclerotinia sclerotiorum by acidifying host tissue, chelating calcium, and suppressing oxidative bursts (Cessna et al., 2000).
What methods study oxalate's virulence effects?
pac1 mutants abolish oxalate production, confirming avirulence (Rollins, 2003); ROS assays measure suppression (Cessna et al., 2000); redox probes track host manipulation (Williams et al., 2011).
What are key papers on this topic?
Amselem et al. (2011, 1053 citations) provides Sclerotinia genomics; Cessna et al. (2000, 552 citations) demonstrates oxidative burst suppression; Williams et al. (2011, 458 citations) details redox mechanisms.
What open problems exist?
Crop-specific oxalate thresholds for resistance; synergistic effectors with oxalate (Guyon et al., 2014); non-GMO detoxification without yield penalties.
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