4.0 Article

Volatile Metabolomics from Cashew Leaves: Assessment of Resistance Biomarkers Associated with Black Mold (Pilgeriella anacardii Arx & Muller)

Journal

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 33, Issue 12, Pages 1423-1440

Publisher

SOC BRASILEIRA QUIMICA
DOI: 10.21577/0103-5053.20220078

Keywords

Anacardium occidentale; resistance; susceptibility; Pilgeriella anacardii; chemometric analysis; biomarkers

Funding

  1. National Council for Scientific and Technological Development (CNPq, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
  2. National Institute of Science and Technology-INCT BioNat, Brazil [465637/2014-0]
  3. Coordination for the Improvement of Higher Education Personnel (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES) [001]

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This study analyzed the volatile organic compounds (VOCs) in leaves of cashew clones resistant and susceptible to black mold disease and identified chemical compounds associated with resistance. The results showed that the leaves of resistant clones contained specific alcohols and aldehydes, as well as other potential chemical biomarkers for cashew resistance.
Black mold, a disease caused by the fungus Pilgeriella anacardii Arx & Muller, affects cashews (Anacarditan occidentale). Some cashew clones are more resistant to the pathogen; however, little is known about the chemical profile responsible for this trait. The investigation of volatile organic compounds (VOCs) from leaves of dwarf cashew clones resistant (BRS 226 and BRS 265) and susceptible (CCP 76 and BRS 189) to the pathogen was carried out. Leaves were collected during the months of disease incidence and decline (March to July 2019, Brazil), and VOCs were analyzed by gas chromatography-mass spectrometry (GC-MS) combined with chemometric tools. The GC-MS analysis tentatively identified 96 compounds. Partial least squares discriminant analysis (PLS -DA), orthogonal partial least squares discriminant analysis (OPLS-DA), hierarchical cluster analysis (HCA), and ROC curves analysis were useful in dividing VOCs into distinct resistance and associated chemical susceptibility groups for different clones. The VOCs in the leaves of the resistant clones were identified as alcohols and aldehydes containing six carbons: (E)-hex-2-enal, hex-3-en-1-ol, (Z)-hex-2-en-1-ol, (E)-hex-2-en-1-ol, and hexan-1-ol. Moreover, alpha-pinene, pseudolimonene, alpha-phellandrene, beta-myrcene, sylvestrene, beta-cis-ocimene, methyl salicylate, myrtenol, alpha-copaene, gamma-muurolene, germacrene D, valencene, and germacrene B were also detected in these samples and may be candidate chemical biomarkers for cashew resistance to P anacardii.

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