Reaction to late blight in response to nitrogen management in Argentine potato cultivars |
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| Affiliation: | 1. Facultad de Ciencias Agrarias, UNMdP, CC 276, Ruta Nacional 226 km 73,5, 7620 Balcarce, Argentina;2. INTA, Balcarce Experimental Station, CC 276, Ruta Nacional 226 km 73,5, Balcarce, Argentina;3. Instituto de Investigaciones Biológicas, UNMdP-CONICET, CC 1245 Funes 3250, Mar del Plata, Argentina;1. CIRAD, PERSYST, UPR AIDA, Montpellier, France;2. BIOPASS, ISRA-IRD-UCAD, Campus de Bel-Air, Dakar, Senegal;3. CIRAD, PERSYST, UPR HORTSYS, Montpellier, France;4. IITA, Benin Station, Cotonou, Benin;5. UAC, FSA, Cotonou, Benin;6. INRAB, PCM, Cotonou, Benin;7. UGB, UFR S2ATA, Saint-Louis, Senegal;8. UCAD, FST, Dakar, Senegal;9. IER, CRRA de Sotuba, Bamako, Mali;10. ISRA, CDH, Dakar, Senegal;11. AFRICARICE, Cotonou, Benin;12. CSE, Dakar, Senegal;1. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China;2. Shandong Key Laboratory of Plant Virology, Institute of Plant Protection, Shandong Academy of Agricultural Sciences, Jinan 250100, China;3. Department of Entomology, Plant Pathology and Nematology, University of Idaho, Moscow, ID 83844, USA;1. Wageningen UR Livestock Research, P.O. Box 338, 6700 AH Wageningen, The Netherlands;2. Wageningen University, Farm Technology Group, P.O. Box 16, 6700 AA Wageningen, The Netherlands;1. South China Agricultural University, College of Animal Science, South China Agricultural University, Wushan Avenue, Tianhe District, Guangzhou, 510642, China;2. SCAU-UniOil Feeding Oil &Fat Research Centre, Guangzhou, 510642, China;1. University of Florida, IFAS, Environmental Horticulture Dept., 1549 Fifield Hall, Gainesville, FL 32611, United States;2. University of Florida, IFAS, Soil and Water Sciences Dept., 2181 McCarty Hall, Gainesville, FL 32611, United States;3. University of Connecticut, Department of Plant Science and Landscape Architecture, 1376 Storrs Rd, Unit 4067, Storrs, CT 06269, United States |
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| Abstract: | The objective of this study was to evaluate the reaction to late blight of two potato cultivars in response to nitrogen (N) management under field and in Vitro conditions. In Balcarce trial a reduction in phenols with the addition of excess N was found. Despite the reduction of the concentration of phenols no differences in the relative area under disease progress curve (rAUDPC) were observed between N levels. In Tafí del Valle, the rAUDPC denoted an interaction between cultivar and N level. In Frital, the N0 showed lower rAUDPC than N optimal (Opt) and N excessive (Exc) treatments. In contrast, no differences in rAUDPC between N levels on Pampeana were found. In the detached leaf test, no significant differences between N levels were observed in the threshold of severity of disease and the lesion growth rate. In conclusion, excessive N fertilization did not increase the susceptibility to late blight in this study. |
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