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• W2803728362 abstract "The cultivated tomato, Solanum lycopersicum L., is the most valuable vegetable crop worldwide and ranks sixth among all crops. Besides its production value, the tomato is used as a model plant for crop research. However, the tomato is susceptible to over 200 diseases, which can lead to loss of productivity due to crop damage and disease management. One of the most devastating diseases of tomato is late blight (LB), caused by the oomycete Phytophthora infestans (Mont.) de Bary, which can destroy an unprotected crop in 7 – 10 days. Currently the most common method of controlling LB is through the frequent use of fungicides. However, changes in the pathogen have resulted in development of isolates which can overcome these fungicides. An alternative form of disease control is through host resistance of the crop, which can help reduce or eliminate the use of fungicides, leading to lower production costs and reduced environmental impacts. Very little LB resistance has been observed in the cultivated tomato; however, strong resistance exists in related wild species of tomato, including its closest relative, S. pimpinellifolium. Several LB-resistance genes have already been identified and introgressed into cultivated lines and commercial cultivars of tomato; however, isolates of P. infestans have since been identified which can overcome each of the known resistance genes, driving the need to identify new sources of LB resistance.A recent screening of 67 S. pimpinellifolium accessions identified 12 accessions with nearly complete LB resistance under greenhouse or field conditions. In the present study, two of those accessions, PI 270441 and PI 270442, were hybridized with an elite tomato breeding line, Fla. 8059, to create two distinct genetic and breeding populations, which were evaluated for genetic inheritance of LB resistance. Heritability (h2) was measured/estimated using the response to selection equation and generation means analysis (GMA) for the PI 270441 population, and parent-offspring correlation analysis, response to selection, and GMA for the PI 270442 population. Heritability for the PI 270441 population was estimated to range from 0.76 – 0.78 while that for PI 270442 was estimated between 0.60 – 0.86. These moderately high levels of heritability suggest that PI 270441 and PI 270442 could be valuable resources for breeders looking to incorporate LB resistance into the cultivated tomato.Studies were also conducted to identify and map quantitative trait loci (QTLs) conferring LB resistance in these accessions. A trait-based analysis was performed by selecting individuals with extreme resistance and susceptibility in F2 populations for marker genotyping and QTL analysis. Initially, a total of 4,430 single nucleotide polymorphism (SNP) markers were identified for use in the two populations. For the population derived from PI 270441, 201 SNP markers were used to generate a linkage map and conduct QTL analysis employing 83 F2 individuals. Four QTLs associated with the LB-resistant wild parent and two associated…" @default.
• W2803728362 created "2018-06-01" @default.
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• W2803728362 date "2015-11-16" @default.
• W2803728362 modified "2023-09-23" @default.
• W2803728362 title "Identification and mapping of new late blight resistance genes in the tomato wild species Solanum pimpinellifolium" @default.
• W2803728362 hasPublicationYear "2015" @default.
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