REACTION OF BANANA CULTIVARS TO THE Meloidogyne javanica X Fusarium oxysporum f. sp. cubense COMPLEX

Abstract

The interaction Fusarium oxysporum f. sp. cubense (Foc) x nematode and the genetic variability of Foc are the main problems with potential to affect the use of resistant varieties in the management of the Panama disease. The objective of this work was to evaluate the interaction between Foc and Meloidogyne javanica on the banana of the Prata Anã, Grande Naine and BRS Princesa cultivars. The experiment was conducted in a randomized block design, with six treatments and ten replications, which differed in the inoculation time of each pathogen. Simultaneous inoculation with Foc and M. javanica, inoculation with Foc one week before inoculation with M. javanica, and inoculation with M. javanica one week before inoculation with Foc. In addition to the controls, Foc isolated, M. javanica isolated, and cultivars without the pathogens. The seedlings were transplanted in 3-liter pots with sterile soil infested with 40 grams of Foc inoculum at the concentration of 1x10 6 CFU/gram and 1000 eggs and J2 of M. javanica. At the end of 56 days, the treatments with 'Grande Naine' presented the highest reproduction factors of M. javanica. In the 'Prata Anã' no interaction was observed between Foc x M. javanica. The treatments with simultaneous inoculation of the two pathogens, and with Foc a week before, in the 'BRS Princesa', presented the highest external disease indices (DI), which promoted the highest AUDPC. The highest internal DI were observed in the treatments Foc+Mj+Grande Naine, Foc+Mj+BRS Princesa, Mj+Grande Naine+Foc and Foc+BRS Princesa+Mj. The simultaneous presence of M. javanica and Foc increases the severity of the Panama disease in Grande Naine and BRS Princesa cultivars. Keywords: Musa spp.. Fusarium wilt. Root-knot nematodes. Interaction. Panama disease. REAÇÃO DE CULTIVARES DE BANANEIRA AO COMPLEXO Meloidogyne javanica X Fusarium oxysporum f. sp. cubense RESUMO -A interação Fusarium oxysporum f. sp. cubense (Foc) x nematoide e a variabilidade genética de Foc são os principais problemas com potencial de afetar o uso de variedades resistentes no manejo do mal-do-Panamá. O objetivo do trabalho foi avaliar a interação entre Foc e Meloidogyne javanica sobre as cultivares de bananeiras, Prata Anã, Grande Naine e BRS Princesa. O experimento foi conduzido em DBC, com seis tratamentos e dez repetições, os quais se diferenciaram no tempo de inoculação de cada patógeno. Inoculação simultânea de Foc e M. javanica, inoculação de Foc uma semana antes de M. javanica e inoculação de M. javanica uma semana antes de Foc. Além dos controles, Foc isolado, M. javanica isolado e cultivares sem patógenos. As mudas foram transplantadas em vasos de três litros com solo estéril infestado com 40 gramas de inóculo de Foc na concentração de 1x106UFC/grama e 1000 ovos e J2 de M. javanica. Ao final de 56 dias, os tratamentos em 'Grande Naine' apresentaram os maiores fatores de reprodução de M. javanica. Em 'Prata Anã' não foi observado interação entre Foc x M. javanica. Os tratamentos com inoculação simultânea dos dois patógenos e com Foc uma ...

Interaction between Fusarium oxysporum f. sp. cubense and Radopholus similis can lead to changes in the resistance of banana cultivars to Fusarium wilt

“…In addition to the variants that exist in the Foc population, the interaction of the fungal pathogens with nematodes may interfere with the expression and durability of resistance to FW. The breakdown of resistance is not only related to the damage caused by the nematodes that allow the pathogen to enter the roots, but also to the production and secretion of proteins associated with the pathogenicity that interfere with gene expression and the cell metabolism of the host plant (Davis et al 2000;Hussey et al 2002;Davis et al 2004;Rocha et al 2018). Previous studies assessed the effects of the interactions between Foc and R. similis in banana cultivars using susceptible and moderately susceptible cultivars to FW.…”

REACTION OF PASSION FRUIT GENOTYPES TO THE COMPLEX Meloidogyne incognita AND Fusarium solani

“…Then, 40 mL of sterilized distilled water were added to the Petri dishes and, with the aid of a brush, the conidia were disaggregated. The suspension was filtered in a sterilized gauze, and the concentration of spores was calibrated in a hemacytometer to 1×10 6 spores/mL (CARVALHO, et al, 2021;ROCHA, et al, 2018;SILVA, et al, 2013).…”

“…Regarding the interaction Fusarium -Meloidogyne, several studies already confirmed that the nematode makes the plants more prone to infection by the fungus (ROCHA, et al, 2018, GOMES, et al, 2011PEREIRA, 2008). There are still no consistent results showing the interaction between M. incognita and F. solani in passion fruit crops.…”

“…Several studies show that the reaction of plants to fungi can be changed when plants are infected with Meloidogyne spp. (ROCHA, et al, 2018;ABD-EL-FATTAH et al, 2012;CARNEIRO;RAMALHO;PEREIRA, 2010). The presence of this nematode can increase damages in species susceptible to fungi and changes the phenotype of resistance in resistant species to a phenotype of susceptibility (FISCHER et al, 2010).…”

Efeito das concentrações de farinha de cascas de banana e de sacarose nas características físicas e químicas de bolos

“…É a segunda fruta mais consumida do planeta (Handique et al, 2019), sendo a Índia o maior produtor, com 1/3 do total da produção mundial (Ghag & Ganapathi, 2019). O Brasil é o quinto maior produtor (Rocha et al, 2018), com uma produção em 2017 de 6,735 milhões de toneladas em uma área de 468,754 mil hectares (Instituto Brasileiro de Geografia e Estatística, 2019). Atualmente, a safra brasileira é baseada em cultivares do subgrupo Prata, com destaque para o clone Prata Anã (AAB), Gorutuba e Catarina (Rocha et al, 2018), sendo que no Acre as cultivares predominantes são Prata Comum, D'Angola (conhecida regionalmente como banana-comprida), Maçã e Pacovan, além das cultivares que foram recomendadas pela Embrapa Acre: Thap Maeo, Maravilha, Preciosa, Pacovan Ken e Japira (Sá et al, 2016).…”