Overwintering Hosts, Compatibility Types, and Races of<i>Phytophthora infestans</i>on Tomato in Southern California

Vartanian, V. G.; Endo, Romeu Munashi

doi:10.1094/pd-69-516

Cited by 34 publications

(17 citation statements)

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“…This study also demonstrated that the incidence and severity of infection were higher on climbing nightshade young plants, grown from seed, than on mature plants, under greenhouse conditions. However, the study should be repeated on whole plants under field conditions for confirmation, Vartanian and Endo (1985) demonstrated that 11 solanaceous plant species were susceptible to P. infestans in the greenhouse, but only tomato, potato, and S. sarrachoides became infected under field study conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The occurrence of new genotypes of the pathogen on potato, tomato, and hairy nightshade raises concerns about the potential of the new genotypes to infect other related plant species and provide new sources of inoculum of the pathogen. While Vartanian and Endo (1985) determined that 11 solanaceous plant species were susceptible to tomato strains race 1 (Tl) and race 2 (TO), no recent investigations on alternative hosts for this disease in Canada have been published. To better understand this situation, three genotypes of P. injestans (US-1, US-8, and US-11) were used to assess the response of 10 different plant hosts or potential hosts to late blight.…”

Section: Introductionmentioning

confidence: 99%

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Response of solanaceous cultivated plants and weed species to inoculation with A1 or A2 mating type strains ofPhytophthora infestans

Platt¹

1999

Canadian Journal of Plant Pathology

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Hypersensitive response symptoms of late blight were induced when sporangia of Phytophthora infestans were inoculated on discs of excised leaf tissues of black nightshade, eggplant, green pepper, and tobacco. No symptoms due to disease or hypersensitive response were observed in stem piece tissues of these plant species, suggesting that these four are nonhosts for late blight. The Al (US-1), the A2 (US-8), and the more recent Al mating type (US-ll) strains infected both leaf and stem tissues of climbing and hairy nightshade, potato, and tomato but only leaf tissues of petunia. This is the first report of the new strains of P. infe stans causing late blight symptoms on climbing nightshade and petunia in Canada. Based on infection levels, infection rates, and spore production, the US-8 and US-ll genotypes were similar and both were more aggressive than the US-1 genotype. Disease severity and sporulation were greater on potato inoculated with US-1 than for the other host plants and were the least on petunia. All susceptible plants were infected at about the same level with US-8, except for petunia, which had a much lower level of infection. Spore production for US-8 was less on tomato and petunia than on the other plants. Infection levels and spore production by US-ll on tomato were as great as or greater than on potato. These results demonstrate that the new strains of P. infestans, US-8 and US-ll, are generally more aggressive than the previous predominating strain, US-1, and that climbing and hairy nightshade and petunia may harbour late blight, while black nightshade, eggplant, green pepper, and tobacco plants do not.Key words: late blight, host range.Résumé : Des symptömes dus a la reaction d'hypersensibilité (RH) causée par Ie mildiou ont été observes lorsque des sporanges de Phytophthora infestans ont été inoculées a des disques foliaires provenant de plants de morelle noire, d'aubergine, de poivron ou de tabac. Par ailleurs, aucuns symptömes dus a la maladie ou a la RH n'ont été observes sur des tissus de tiges provenant des mêmes plantes, ce qui laisse penser qu'aucune des quatre espèces ne constitue un höte pour l'agent du mildiou. La souche de type sexuel Al (US-l), celle de type sexuel A2 (US-8), ainsi que la récente souche de type Al (US-ll) ont infecté les feuilles et les tiges de morelle douce-amère, de morelle poilue, de pomme de terre et de tomate, mais seulement les feuilles de Petunia. Ces résultats sont les premiers a rapporter des symptömes de mildiou cause par les nouvelles souches de P. infestans sur morelle douce-amère et sur Petunia au Canada. Sur la base des niveaux et taux d'infection, et de la production de spores, les genotypes US-8 et US-ll ont donné des résultats similaires, et étaient plus aggressifs que Ie genotype US-l. La sévérité de la maladie et la sporulation étaient plus importantes chez la pomme de terre inoculée avec US-l que sur les autres plantes hötes, et les moins importantes chez Petunia. Toutes les plantes sensibles avaient des niveaux d'infection similaires avec US-8, ...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Response of solanaceous cultivated plants and weed species to inoculation with A1 or A2 mating type strains ofPhytophthora infestans

Platt¹

1999

Canadian Journal of Plant Pathology

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“…Clinton was the first to observe oogonia with amphigynous antheridia and oospores in pure culture of a single strain of P. infestans (Clinton, 1911). Self-fertile isolates of P. infestans have been identified among field isolates in Japan (Mosa et al, 1989), Canada , England and Wales (Tantius et al, 1986;Fyfe and Shaw, 1992), Mexico (Gallegly and Galindo, 1958;Galindo and Gallegly, 1960;Niederhauser, 1961;Goodwin et al, 1992b), and several locations in the United States (Vartanian and Endo, 1985;Miller et al, 1997).…”

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confidence: 99%

Self-Fertility in Two Clonal Lineages ofPhytophthora infestans

Smart

Willmann

Mayton

et al. 1998

Fungal Genetics and Biology

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“…Meiosis would seem to be more accurate in 550 than in Ca65. Perhaps selection in a predominantly sexual population in central Mexico (550) has maintained accurate division at meiosis in the 550 lineage; in populations thought to be predominantly asexual from California (Ca65) (Vartanian and Endo, 1985), such selection may have been relaxed.…”

Section: Nontriploid Offspring With Extra Allelesmentioning

confidence: 99%

The Detection of Nonhybrid, Trisomic, and Triploid Offspring in Sexual Progeny of a Mating of Phytophthora infestans

Carter

Buck

Archer

et al. 1999

Fungal Genetics and Biology

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Overwintering Hosts, Compatibility Types, and Races ofPhytophthora infestanson Tomato in Southern California

Cited by 34 publications

References 0 publications

Response of solanaceous cultivated plants and weed species to inoculation with A1 or A2 mating type strains ofPhytophthora infestans

Response of solanaceous cultivated plants and weed species to inoculation with A1 or A2 mating type strains ofPhytophthora infestans

Self-Fertility in Two Clonal Lineages ofPhytophthora infestans

The Detection of Nonhybrid, Trisomic, and Triploid Offspring in Sexual Progeny of a Mating of Phytophthora infestans

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