The effect of 6-benzylaminopurine on polymethoxyflavone levels in tangelo Nova fruits and the possible participation of these secondary metabolites in defense mechanisms against Phytophthora citrophthora are studied. The in vitro study of the inhibitory effect of these compounds on fungal growth reveals that nobiletin is the most active agent followed by sinensetin, heptamethoxyflavone, and tangeretin. Treatment with 100 ppm of 6-benzylaminopurine increased the levels of these polymethoxyflavones in this Citrus hybrid and also enhanced the in vivo resistance of the fruit to the fungus by approximately 60%.
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http://dx.doi.org/10.1021/jf011382a | DOI Listing |
Ital J Food Saf
November 2024
Plant Pathology and Postharvest Quality Laboratory, Regional Center for Agronomical Research of Kenitra, Morocco.
Biotic stress significantly challenges the global citrus industry. Major post-harvest issues include diseases caused by , and . The negative impact of chemical fungicides on the environment and health necessitates eco-friendly alternatives.
View Article and Find Full Text PDFFungal Syst Evol
June 2024
Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, Gauteng, South Africa.
The genus contains many destructive and globally important plant pathogens. In the last decade, targeted sampling efforts have resulted in a dramatic increase in the number of known species, as well as a better understanding of their global distribution. Routine activities undertaken in botanical gardens, combined with great numbers of local and international visitors, place botanical gardens at risk to the accidental introduction and establishment of pathogens such as spp.
View Article and Find Full Text PDFMolecules
April 2024
Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland, College of Agriculture, Yangtze University, Jingzhou 434025, China.
The natural pesticide phenazine-1-carboxylic acid (PCA) is known to lack phloem mobility, whereas Metalaxyl is a representative phloem systemic fungicide. In order to endow PCA with phloem mobility and also enhance its antifungal activity, thirty-two phenazine-1-carboxylic acid--phenylalanine esters conjugates were designed and synthesized by conjugating PCA with the active structure -acylalanine methyl ester of Metalaxyl. All target compounds were characterized by H NMR, C NMR and HRMS.
View Article and Find Full Text PDFPlant Dis
June 2024
Department of Microbiology and Plant Pathology, University of California, Riverside, CA 92521.
Isolates of the citrus brown rot pathogens and from the Inland Empire (IE) and Ventura Co. (VE) regions of southern California were evaluated for their sensitivity to ethaboxam, fluopicolide, mandipropamid, and oxathiapiprolin, and the previously published baselines that were generated for Central Valley (CV) isolates of California were expanded. Fungicides were generally more toxic to CV isolates of both species for all four fungicides.
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