Resistance to aspergillus flavus and aspergillus parasiticus in almond advanced selections and cultivars and its interaction with the aflatoxin biocontrol strategy

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cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationUniversity of Córdobaen
cg.contributor.affiliationCalifornia State Universityen
cg.contributor.affiliationUniversity of California-Davis Kearney Agricultural Research and Extension Centeren
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.affiliationUniversity of Californiaen
cg.contributor.crpAgriculture for Nutrition and Health
cg.contributor.donorFICYT foundationen
cg.contributor.donorCalifornia Pistachio Research Boarden
cg.contributor.donorCitoliva Foundationen
cg.contributor.donorGovernment of Spainen
cg.contributor.donorAlmond Board of Californiaen
cg.creator.identifierAlejandro Ortega-Beltran: 0000-0003-3747-8094
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1094/pdis-05-21-0892-reen
cg.identifier.iitathemePLANT PRODUCTION & HEALTH
cg.isijournalISI Journalen
cg.issn0191-2917en
cg.issue2en
cg.journalPlant Diseaseen
cg.reviewStatusPeer Reviewen
cg.subject.iitaAGRONOMYen
cg.subject.iitaDISEASE CONTROLen
cg.subject.iitaFOOD SECURITYen
cg.subject.iitaPLANT DISEASESen
cg.subject.iitaPLANT HEALTHen
cg.subject.iitaPLANT PRODUCTIONen
cg.subject.impactAreaNutrition, health and food security
cg.subject.sdgSDG 2 - Zero hungeren
cg.volume106en
dc.contributor.authorMoral, J.en
dc.contributor.authorGarcia-Lopez, M.T.en
dc.contributor.authorGordon, A.en
dc.contributor.authorOrtega Beltran, A.en
dc.contributor.authorPuckett, R.D.en
dc.contributor.authorTomari, R.en
dc.contributor.authorGradziel, T.M.en
dc.contributor.authorMichailides, T.en
dc.date.accessioned2022-05-05T12:39:06Zen
dc.date.available2022-05-05T12:39:06Zen
dc.identifier.urihttps://hdl.handle.net/10568/119476
dc.titleResistance to aspergillus flavus and aspergillus parasiticus in almond advanced selections and cultivars and its interaction with the aflatoxin biocontrol strategyen
dcterms.abstractAflatoxin contamination of almond kernels, caused by Aspergillus flavus and A. parasiticus, is a severe concern for growers because of its high toxicity. In California, the global leader of almond production, aflatoxin can be managed by applying the biological control strain AF36 of A. flavus and selecting resistant cultivars. Here, we classified the almond genotypes by K-Means cluster analysis into three groups (susceptible [S], moderately susceptible [MS], or resistant [R]) based on aflatoxin content of inoculated kernels. The protective effects of the shell and seedcoat in preventing aflatoxin contamination were also examined. The presence of intact shells reduced aflatoxin contamination >100-fold. The seedcoat provided a layer of protection but not complete protection. In kernel inoculation assays, none of the studied almond genotypes showed a total resistance to the pathogen. However, nine traditional cultivars and four advanced selections were classified as R. Because these advanced selections contained germplasm derived from peach, we compared the kernel resistance of three peach cultivars to that shown by kernels of an R (Sonora) and an S (Carmel) almond cultivar and five pistachio cultivars. Overall, peach kernels were significantly more resistant to the pathogen than almond kernels, which were more resistant than pistachio kernels. Finally, we studied the combined effect of the cultivar resistance and the biocontrol strain AF36 in limiting aflatoxin contamination. For this, we coinoculated almond kernels of R Sonora and S Carmel with AF36 72 h before or 48 h after inoculating with an aflatoxin-producing strain of A. flavus. The percentage of aflatoxin reduction by AF36 strain was greater in kernels of Carmel (98%) than in those of Sonora (83%). Cultivar resistance also affected the kernel colonization by the biological control strain. AF36 strain limited aflatoxin contamination in almond kernels even when applied 48 h after the aflatoxin-producing strain. Our results show that biocontrol combined with the use of cultivars with resistance to aflatoxin contamination can result in a more robust protection strategy than the use of either practice in isolation.en
dcterms.accessRightsLimited Access
dcterms.audienceScientistsen
dcterms.available2022-02-05
dcterms.bibliographicCitationMoral, J., Garcia-Lopez, M.T., Gordon, A., Ortega-Beltran, A., Puckett, R.D., Tomari, R., ... & Michailides, T. (2022). Resistance to aspergillus flavus and aspergillus parasiticus in almond advanced selections and cultivars and its interaction with the aflatoxin biocontrol strategy. Plant Disease, 106(2), 504-509.en
dcterms.extent504-509en
dcterms.issued2022-02-01
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherScientific Societiesen
dcterms.subjectaflatoxinsen
dcterms.subjectalmondsen
dcterms.subjectaspergillus flavusen
dcterms.subjectaspergillus parasiticusen
dcterms.subjectcultivarsen
dcterms.subjectdisease resistanceen
dcterms.typeJournal Article

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