Blandón-Díaz, Jorge Ulises
(2011).
Insights into population structure and epidemiology of Phytophthora infestans from Nicaragua.
Diss. (sammanfattning/summary)
Uppsala :
Sveriges lantbruksuniv.,
Acta Universitatis Agriculturae Sueciae, 1652-6880
; 2011:36
ISBN 978-91-576-7581-1
[Doctoral thesis]
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Abstract
Late blight caused by Phytophthora infestans (Mont) de Bary is a constraint to both potato and tomato crops in the northern highlands of Nicaragua. This thesis describes studies on population structure and epidemiology of P. infestans from Nicaragua.
The genotypic and phenotypic variation in isolates of P. infestans collected in potato and tomato growing areas of northern Nicaragua were analyzed using genotypic (SSR fingerprinting and mtDNA haplotyping) and phenotypic markers (mating type, virulence and fungicide sensitivity). Genotypic markers revealed no polymorphism among the P. infestans isolates tested. Phenotypic variation was observed. Nicaraguan population of P. infestans is dominated by a clonal lineage of the A2 mating type, Ia mtDNA haplotype and no evidence of genetic population differentiation among potato and tomato isolates was found.
The aggressiveness of P. infestans isolates sampled from potato and tomato fields was determined through cross-inoculations experiments. Potato and tomato isolates both had a shorter LP, higher SP, and were more aggressive on tomato leaflets compared to potato ones.
The adequacy of the late blight simulation model LATEBLIGHT (version LB2004) was evaluated under Nicaraguan conditions. During 2007-2008 field experiments were conducted in Nicaragua. The simulation model was considered adequate as it accurately predicted high disease severity in susceptible cultivars without fungicide sprays, and demonstrated a decrease in the disease progress curves with additional fungicide applications, similar to that observed in the field plots. The quantitative relationship between host resistance and the need for fungicide was also investigated using simulations performed with LATEBLIGHT, as well as field trials.
Authors/Creators: | Blandón-Díaz, Jorge Ulises | ||||||||||
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Title: | Insights into population structure and epidemiology of Phytophthora infestans from Nicaragua | ||||||||||
Series Name/Journal: | Acta Universitatis Agriculturae Sueciae | ||||||||||
Year of publishing : | 20 April 2011 | ||||||||||
Number: | 2011:36 | ||||||||||
Number of Pages: | 74 | ||||||||||
Papers/manuscripts: |
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Place of Publication: | Uppsala | ||||||||||
Publisher: | Dept. of Forest Mycology and Pathology, Swedish University of Agricultural Sciences | ||||||||||
ISBN for printed version: | 978-91-576-7581-1 | ||||||||||
ISSN: | 1652-6880 | ||||||||||
Language: | English | ||||||||||
Publication Type: | Doctoral thesis | ||||||||||
Full Text Status: | Public | ||||||||||
Subjects: | Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Plant and forest protection (A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science | ||||||||||
Agrovoc terms: | phytophthora infestans, solanum tuberosum, lycopersicon esculentum, blight, plant diseases, epidemiology, genotypes, host pathogen relations, disease resistance, simulation models, nicaragua | ||||||||||
Keywords: | Phytophthora infestans diversity, Epidemiology, LATEBLIGHT simulation model | ||||||||||
URN:NBN: | urn:nbn:se:slu:epsilon-e-59 | ||||||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-59 | ||||||||||
ID Code: | 8080 | ||||||||||
Department: | (NL, NJ) > Dept. of Forest Mycology and Plant Pathology (S) > Dept. of Forest Mycology and Plant Pathology | ||||||||||
External funders: | Swedish International Development Cooperation Agency | ||||||||||
Deposited By: | Insights i JU Blandón-Díaz | ||||||||||
Deposited On: | 26 Apr 2011 13:53 | ||||||||||
Metadata Last Modified: | 02 Dec 2014 10:45 |
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