Inheritance of resistance to Phytophthora infestans (Peronosporales, Pythiaceae) in a new source of resistance in tomato (Solanum sp. (formerly Lycopersicon sp.), Solanales, Solanaceae)

Abstract

In Brazil, no commercial tomato (Solanum lycopersicum L. formerly Lycopersicon esculentum Mill.) varieties are available which are resistant to the late blight, one of the most important tomato diseases, produced by the phytopathogenic oomycete Phytophthora infestans. The wild tomato (Solanum habrochaites Knapp & Spooner, formerly Lycopersicon hirsutum Dunal) shows resistance to P. infestans, because of which we investigated an interspecific cross between S. lycopersicum cv. Santa Clara and S. habrochaites accession BGH 6902 maintained at the Horticultural Germplasm Bank at the Federal University of Viçosa (Banco de Germoplasma de Horticultura (BGH), Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brazil) The genitors, F 1 , F 2 , BC 1 and BC 2 were used to study the inheritance of resistance to P. infestans and to estimate the genetic parameters associated with resistance. Analysis of the area under the disease progress curve (AUDPC) indicated that inheritance is polygenic and that dominance controls character, whereas mean analysis showed that the additive effect was the most important. Although the character presents variability, the heritability is low which generates the need to better control the environment to obtain success with the selection.

The inheritance of late blight resistance derived from Solanum habrochaites

“…An interspecific F 1 progeny (S. lycopersicum L. cv. Santa Clara x S. habrochaites f. glabratum) accession BGH 6902 exhibited resistance to numerous P.infestans isolates under field conditions of Viçosa, MG state (Abreu et al 2008). The purpose of the present study was to study the inheritance of resistance to late blight in the inbred line '163A' originated from the interspesific cross between S. lycopersicum L.cv.…”

“…The characterization of over than 350 tomato accessions of the BGH (http://www. bgh.ufv.br) resulted in define many resistance sources as well as to Tuta absoluta (Moreira et al 2005, Oliveira et al 2009), potyvirus (Zucchini yellow mosaic virus, ZYMV and Pepper yellow mosaic virus, PepYMV) (Moura et al 2005, Juhász et al 2008, whitefly (Bemisia tabaci biotype B) (Fernandes et al 2009), Phytophthora infestans (Abreu et al 2008) and geminivirus (Tomato yellow spot virus, ToYSV) (Aguilera et al 2008). …”

Agrupamento de curvas de progresso de requeima, em tomateiro originado de cruzamento interespecífico

“…Em relação à qualidade desse modelo, Souza (2006) Testemunha resistente (Abreu et al, 2008;Fiorini et al, 2010), S. habrochaites Knapp & Spooner.…”

“…Não há genótipos com boas características agronômicas e comerciais que apresentem nível satisfatório de resistência à requeima (Mizubuti, 2005), e a resistência a diversos patógenos é comumente encontrada em espécies silvestres, como Solanum habrochaites f. glabratum (Laterrot, 2000;Abreu et al 2008).…”

“…Abreu et al (2008), e, nas gerações F 5 e F 8 , selecionadas como fonte de resistência à requeima (Abreu, 2005;Fiorini et al, 2010). O acesso BGH 1497 destacouse, entre 72 genótipos de tomateiro avaliados, por possuir bom nível de resistência à requeima (Fiorini et al, 2010).…”