Abstract
This work aimed to study the inheritance of resistance to Phytophthora infestans in tomato plants, using the maximum likelihood estimation function. The susceptible cultivar Santa Clara (Solanum lycopersicum) was used as the female genitor and the P. infestans resistant S. habrochaites f. glabratum accession (BGH 6902) as the male genitor. F1 plants from the crossing were self-pollinated to produce F2 progenies, and also backcrossed with PR and PS to produce BC1:R and BC1:S generations, respectively. The tomato plants were inoculated 50 days after transplanting. Disease severity was evaluated via a diagrammatic scale. Comparison of the genetic models created using the maximum likelihood function revealed that the inheritance of resistance to P. infestans in S. habrochaites is conferred by a major gene with additive and dominance effects, polygenes with additive effects, plus the environmental effect. Vertical resistance can be explored using genes with major effects. Programs of recurrent and maker-assisted selection are considered efficient strategies with which to select genotypes that hold P. infestans resistance conferred by polygenes.
Highlights
Tomato crops are largely recognized for their socioeconomic and nutritional importance worldwide
P. infestans RESISTANCE IN S. habrochaites emergence of more virulent isolates of the pathogen, that are resistant to existing fungicides, as well as growing concerns regarding environmental safety, the introduction of resistance genes in tomato plants seems to be the most promising pathogencontrol strategy (Park et al 2005)
The aim of the present work was to study the mixed inheritance of resistance to P. infestans in tomato plants using a method based on maximum likelihood estimators (MLEs) to model and estimate parameters related to major genes and polygenes
Summary
Tomato crops are largely recognized for their socioeconomic and nutritional importance worldwide. Commercial tomato production is subjected to high economic and financial risk, especially considering the large number of diseases that affect tomato plants. Among these diseases, Management strategies for P. infestans in tomato crops often involve the application of large amounts of fungicides. P. infestans RESISTANCE IN S. habrochaites emergence of more virulent isolates of the pathogen, that are resistant to existing fungicides, as well as growing concerns regarding environmental safety, the introduction of resistance genes in tomato plants seems to be the most promising pathogencontrol strategy (Park et al 2005). The use of P. infestans resistant cultivars/accessions minimizes fungicide application, both reducing costs and making the pathogen management easier, not to mention being a more environmentally friendly alternative. Understanding P. infestans resistance gene inheritance mode regarding the expression of a character, plays an important role in directing breeding program activities and in achieving genetic gains (Batista et al 2017)
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