Resistance of the wild tomato Solanum habrochaites to Phytophthora infestans is governed by a major gene and polygenes

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. F 1 plants from the crossing were self-pollinated to produce F 2 progenies, and also backcrossed with P r and P S to produce BC 1:r and BC 1: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 makerassisted selection are considered efficient strategies with which to select genotypes that hold P. infestans resistance conferred by polygenes.

Distinct Phyllosphere Microbiome of Wild Tomato Species in Central Peru upon Dysbiosis

“…In addition, the foliar oomycete Phytophthora infestans (Pinf) causes late blight disease in tomatoes. The wild tomato S. habrochaites shows resistance to Pinf, which is likely steered by polygenes [26]. Also in S. chilense Pinf resistance appears to be polygenic and of quantitative nature [53].…”

A draft genome assembly for the heterozygous wild tomato Solanum habrochaites highlights haplotypic structural variations of intracellular immune receptors

“…Many resistance (R) genes identified from this species have been introgressed into the cultivated tomatoes ( Solanum lycopersicum ) (Chaudhary and Atamian, 2017). Novel disease resistance is continuously searched against diverse pathogens, including oomycete Phytophthora infestans (Li et al ., 2011; Nowakowska et al ., 2014; Copati et al ., 2019), fungi Botrytis cinerea (Finkers et al ., 2007) and bacteria Pseudomonas syringae (Bao et al ., 2015; Thapa et al ., 2015).…”

A single cytochrome P450 oxidase from Solanum habrochaites sequentially oxidizes 7‐epi‐zingiberene to derivatives toxic to whiteflies and various microorganisms

“…Thus, the antimicrobial activity of 9H10epoZ does not seem to be specifically directed against tomato pathogens. Quantitative resistance to P. infestans was found in different accessions of S. habrochaites with quantitative trait loci (QTLs) located on chromosomes 11 and 5 (Johnson et al, 2012;Haggard et al, 2013Haggard et al, , 2014Copati et al, 2019). Accession LA2167 was not included in those studies, and it is still unknown whether the quantitative resistance identified there was based on specialized metabolites.…”