Factors affecting expression of resistance in pepper (Capsicum annuum) to blight caused by Phytophthora capsici in screening trials

Reifschneidbr, Francisco J. B.; Filho, Adalberto Corrêa Café; Rego, A. M.

doi:10.1111/j.1365-3059.1986.tb02042.x

Cited by 42 publications

(50 citation statements)

References 2 publications

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“…This result agrees with observations of Reifschneider et al (1986) and Echer (2001) about adult plant resistance to P. capsici. Phosphite enhanced resistance to P. capsici of Nathalie and Reinger hybrids up to equivalent CM 328 and 334 level.…”

Section: Resultssupporting

confidence: 83%

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Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Sala

Costa²,

Echer

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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Phosphite has been recommended to enhance plant resistance against Phytophthora. This work evaluated the response of hot and sweet pepper (Capsicum annuum L.) to Phytophthora capsici from juvenile up to the adult stage following treatment with phosphite. Sweet pepper hybrids considered to be resistant to P. capsici, like Reinger, Nathalie and Athenas, were evaluated. The susceptible checks were hybrid Magali R and cvs.

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Section: Resultssupporting

confidence: 83%

“…Sweet and hot pepper resistance screening to P. capsici is highly dependent on plant age. Inoculation made at seedling stage may breakdown the resistance (Reifschneider et al, 1986;Echer, 2001). Adult plant resistance to Phytophthora is shown only after 60 days of age.…”

Section: Introductionmentioning

confidence: 99%

Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Sala

Costa²,

Echer

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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“…The spatial distribution of P. capsici isolates differing in virulence will also dictate how resistant varieties should be deployed (Foster and Hausbeck 2010). Previous studies have reported differences in virulence and pathogenicity among P. capsici isolates on vegetable hosts (Kim and Hwang 1992;Oelke and Bosland 2003;Palloix et al 1988;Reifschneider et al 1986;Ristaino 1990). Isolate virulence responses vary by host.…”

Section: Introductionmentioning

confidence: 97%

Differences in virulence of Phytophthora capsici isolates from a worldwide collection on host fruits

2011

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Phytophthora capsici causes root, crown, and fruit rot of vegetable and tropical hosts. Cucumber, zucchini, tomato, and pepper fruits were inoculated using 6-mm-diameter agar plugs of P. capsici, incubated in clear plastic boxes at room temperature (25±2°C and 100% relative humidity), and virulence was estimated by measuring the lesion diameter, pathogen growth diameter, and pathogen sporulation density three (cucumber, zucchini) or four (tomato, pepper) days later. When isolates were grouped by genetic cluster, significant differences in virulence were observed on cucumber and zucchini, with isolates belonging to genetic cluster five causing larger lesions than isolates from genetic cluster six. On tomato, no significant differences were observed for isolates grouped by genetic cluster, but isolates from vegetable crops were generally more virulent than isolates from tropical hosts. Isolates from fabaceous hosts sporulated better on cucumber fruits than isolates from solanaceous hosts. Isolates from vegetable hosts sporulated better on zucchini than isolates from tropical hosts. No significant differences in lesion diameter were noted on pepper when isolates were grouped by host family of origin or genetic cluster, but differences in pathogen sporulation were apparent by host family. Our findings suggest that isolate characteristics such as host family of origin and genetic cluster membership may be used to guide initial isolate selection for cucurbit fruit resistance screening. Final isolate selection should incorporate the phenotypic and genetic diversity of P. capsici, including isolates with differing virulence to the host organ of interest.

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“…x Phytophthora parasitica (Bowman & Graham, 1996); Capsicum annuun x Phytophthora capsici (Reifschneider et al, 1986); Passiflora edulis f. flavicarpa x Phytophthora nicotianae var. nicotianae (Cole et al, 1992), como sendo um dos fatores que afetam a expressão da resistência dos genótipos ao patógeno.…”

Section: Idade Das Plântulasunclassified

Avaliação de métodos, concentrações de inóculo e idade das plântulas para inoculação de Phytophthora palmivora em mamoeiro

Santos¹,

Luz²

2011

Trop. plant pathol.

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RESUMOForam realizados três experimentos em delineamento inteiramente casualizado com 10 repetições por tratamento para avaliar três métodos de inoculação de Phytophthora palmivora, cinco concentrações de inóculo e quatro idades de plântulas de mamoeiro, visando testar a resistência à podridão-do-pé. No experimento 1 foram testados: três genótipos -Golden, Kapoho Solo e Calimosa, aos 60 dias após a semeadura; três métodos de inoculação -deposição de 1 mL do inóculo no substrato encharcado (DSE), idem sem encharcamento (DSS) e imersão do sistema radicular em 200 mL de suspensão de zoósporos (ISR) e cinco concentrações de inóculo 5x10 3 5 zoósporos/mL). No experimento 3, o efeito da inoculação em diferentes idades das plântulas foi testado, inoculando-se plântulas dos três genótipos aos 45, 60, 75 e 90 dias após a semeadura, pelo método DSS com 5x10 4 zoósporos/mL. O tempo médio de sobrevivência (dias) das plantas após a inoculação foi avaliado e as médias comparadas pelo teste de Tukey (p>0,05). Assim, concluiu-se que o método DSS, as concentrações 5x10 4 ou 10 5 zoósporos/mL e plântulas com 60 dias de idade pós-semeadura podem ser utilizados na avaliação de resistência do mamoeiro a P. palmivora. Palavras-chave: Carica papaya, Peronosporales, método de inoculação, podridão-do-pé e dos frutos. ABSTRACT Evaluation of inoculation methods, inoculum concentrations and seedling age for Phytophthora palmivora inoculation on papayaA set of three experiments were conducted in a completely randomized design with 10 replications/treatment aimed at evaluating inoculation methods, inoculum concentrations and seedling age to establish an effective methodology for evaluating papaya accesses for resistance to P. palmivora. In experiment 1, 60 days-old seedlings of three genotypes (Golden, Kapoho Solo and Calimosa) were inoculated using three methods -deposition of 1 mL of zoospore suspension around seedlings planted on wet (DSW) and dry substrate (DDS), and immersion of the seedling root system in 200 mL of the inoculum suspension for 20 minutes (IRS) -and five inoculum concentrations 5x10 3 , 10 4 , 5x10 4 , 10 5 and 5x10 5 zoospores/mL; in experiment two, two genotypes (Golden and Kapoho Solo), two inoculation methods (DSE and DSS) and three inoculum concentrations (10 4 , 5x10 4 and 10 5 ) were tested. Experiment three was aimed at selecting an adequate seedling age. Three papaya genotypes at ages of 45, 60, 75 and 90 days were inoculated through the DSS method using the inoculum concentration of 5x10 4 zoospores/mL and 25 seedlings/treatment. In all experiments the mean number of days of seedling survival after inoculation (days) was utilized for treatment comparisons using Tukey's statistical test (p>0,05). Results of the experiments have indicated that the DDS method of inoculation, the use of 60 day-old seedlings and application of a suspension of 10 5 or 5x10 4 zoospores/mL are adequate for accessing papaya seedling resistance against P. palmivora.

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Factors affecting expression of resistance in pepper (Capsicum annuum) to blight caused by Phytophthora capsici in screening trials

Cited by 42 publications

References 2 publications

Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici

Differences in virulence of Phytophthora capsici isolates from a worldwide collection on host fruits

Avaliação de métodos, concentrações de inóculo e idade das plântulas para inoculação de Phytophthora palmivora em mamoeiro

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