Data/hora: 05/06/2024 09:02:14

Biblioteca(s): | Embrapa Hortaliças.
Data corrente: | 26/10/2023
Data da última atualização: | 26/10/2023
Autoria: | BORGES, R. C. F.; FONSECA, M. E. N.; BOITEUX, L. S.; SANTOS, M. do D. M.; VELOSO, J. S.; AGUIAR, F. M.; REIS, A.
Afiliação: | RAFAELA CRISTINA FERREIRA BORGES, UNIVERSIDADE DE BRASÍLIA; MARIA ESTHER DE N FONSECA BOITEUX, CNPH; LEONARDO SILVA BOITEUX, CNPH; MARIA DO DESTERRO MENDES SANTOS, UNIVERSIDADE DE BRASÍLIA; JOSIENE SILVA VELOSO, UNIVERSIDADE DE BRASÍLIA; FREDERICK MENDES AGUIAR, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL REI; AILTON REIS, CNPH.
Título: | Powdery mildew of chayote (Sechium edule) caused by Podosphaera xanthii race 2 in Brazil
Ano de publicação: | 2023
Fonte/Imprenta: | Journal of Phytopathology, v. 171, p. 583-588, 2023.
DOI: | DOI: 10.1111/jph.13211
Idioma: | Inglês
Conteúdo: | The causal agent of chayote (Sechium edule) powdery mildew (PM) was identified in Brazil. Microscopic examinations revealed hyaline and ovoid conidia, borne in chains and displaying distinctive extra-vacuolar fibrosin bodies. Morphology agreed to the standard description of the anamorph of Podosphaera xanthii. To confirm this identification, genomic DNA was extracted from field isolates and used in PCR assays with ITS primers. Amplicons were Sanger-sequenced and the nucleotide alignments of all isolates displayed identity levels above 97% with P. xanthii isolates in GenBank database. Phylogenetic analyses indicated only P. xanthii isolates as the PM-inducing pathogens in chayote. Inoculation assays were performed using chayote, zucchini and a set of muskmelon differential cultigens for determination of the physiological races of P. xanthii. All chayote isolates were pathogenic to chayote and zucchini seedlings. Five isolates were also pathogenic to the muskmelon cultigens ?Hale's Best Jumbo?, ?Védrantais?, ?PMR-45? and ?Edisto 47?, whereas ?PMR-5? was asymptomatic during the experimental period. The virulence profile of chayote-infecting isolates allowed their classification as P. xanthii race 2. To the best of our knowledge, this is the first worldwide report of P. xanthii race 2 in chayote. This report has relevant epidemiological and disease management implications, allowing more sustainable chayote cultivation under tropical and subtropical conditions.
Thesagro: | Chuchu; Oídio.
Thesaurus Nal: | Sechium.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Hortaliças (CNPH)
Exemplares: | CNPH - (41915-1) - UPC - AP - DD -  -  -  - DIS