Abstract
The objective of this study was to estimate genetic parameters and quantify the correlations between late blight (LB) resistance and fruit quality traits in 220 families F2:3, under tropical field conditions. The families were arranged in randomized blocks in field trials, with six resistant inbred lines used as control, in plots of five plants. It evaluated the severity in the middle of the epidemy, final severity, area under the curve of progress of late blight, pH, total soluble solids, titratable acidity and flavor. There is genetic variability for epidemiological variables and total soluble solids. Heritabilities, obtained by parent-offspring regression, were high and indicated the possibility of satisfactory genetics gains and success in the introgression of resistance alleles. The correlations were negative, of high to intermediate magnitude, among the variables area under the curve of progress of late blight, total soluble solids and total titratable acidity.
Highlights
Late blight (LB) caused by the oomycete Phytophthora infestans (Mont.) de Bary, is the most destructive disease in the cultivated tomato, Solanum lycopersicum L. [1]
Coefficients of experimental variation of high values were estimated for Y50, YMAX and area under the disease progress curve (AUDPC) (Table 1)
Because it is an average value between two trials, high estimates can be due to climatic differences between the periods of evaluation of severity in each trial
Summary
Late blight (LB) caused by the oomycete Phytophthora infestans (Mont.) de Bary, is the most destructive disease in the cultivated tomato, Solanum lycopersicum L. [1]. Late blight (LB) caused by the oomycete Phytophthora infestans (Mont.) de Bary, is the most destructive disease in the cultivated tomato, Solanum lycopersicum L. LB can attack tomato aerial parts, causing necrosis of leaves and stems, fruit losses and eventually plant death. Control methods of this disease include cultural. (2014) Genetic Parameters and Correlation between Tomato Late Blight Field Resistance and Fruit Quality. Cultivars with genetic resistance are a desirable alternative in reducing the environmental and economic fungicide spray coast [3]. The resistance alleles both qualitative and quantitative resistance were in wild species, such as Solanum pimpinellifolium L. The introduction of exotic alleles in elite cultivars may lead to increase in the expression of the undesirable agronomic traits, due to the genetic linkage drag [8]
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