Autoria: ARRIELA, D. A. A.; GUIMARÃES, L. M. da S.; RESENDE, M. D. V. de; LIMA NETO, F. P.; SILVA, D. F. S. H. S.; SIQUEIRA, D. L. de; ALFENAS, A. C.

Resumo: Ceratocystis wilt, caused by Ceratocystis fimbriata is one of the most serious limiting factors for mango production in Brazil. Despite efforts in the selection and the identification of mango cultivars resistant to Ceratocystis wilt, the genetic basis of the resistance remains unknown. Therefore, the objective of this study was to understand the inheritance of resistance to C. fimbriata by artificial inoculations of the pathogen in progenies of six commercial varieties of mango using “Tommy Atkins” as the male parent. The cultivars “Keitt”, “Palmer”, “Tommy Atkins” and “Van Dyke” were confirmed as moderately resistant, whereas “Coquinho”, “Espada” and “Haden” were susceptible. The results of the inoculation on the progenies of these cultivars revealed that the resistance in mango is polygenic with a prevalence of genes expressing the effects of dominance and epistasis. The genetic gain with the selection of the 10 more resistant plants was 46%, which indicated a 46% reduction in disease severity. In general, a low frequency of the alleles favorable to disease resistance was observed in the population studied, which suggests the need for the introduction of new sources of genetic materials carrying the genes responsible for resistance.

Ano de publicação: 2016

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Semiárido

Palavras-chave: Ceratocystis wilt, Doença de planta, Espécie exótica, Fungo, Manga, Mangifera Indica, Plant diseases and disorders