Mycobiota associated with insect galleries in walnut with thousand cankers disease reveals a potential natural enemy against Geosmithia morbida.
Fungal Biol
; 122(4): 241-253, 2018 04.
Article
em En
| MEDLINE
| ID: mdl-29551198
ABSTRACT
Thousand Cankers Disease (TCD) affects Juglans and Pterocarya species. This disease poses not only a major threat to the nut and timber industries but also to native stands of walnut trees. Galleries created by Pityophthorus juglandis (vector) are colonized by the fungus Geosmithia morbida (causal agent of necrosis). It is unknown if other fungi colonizing these galleries might act antagonistically towards G. morbida. The objectives of this study were to (1) characterize the fungal community associated with TCD-infected trees and (2) develop a pilot study addressing their potential antagonism towards G. morbida. We collected non-Geosmithia fungi from ten TCD-infected walnut trees from California and Tennessee. Four hundred and fifty-seven isolates, representing sixty-five Operational Taxonomic Units (99 % ITS similarity) were obtained. Fungal communities were found to be highly diverse. Ophiostoma dominated the communities associated with TCD-compromised trees from California, whereas Trichoderma dominated TCD-compromised trees in Tennessee. Six Trichoderma isolates showed varying levels of antagonism against three isolates of G. morbida, suggesting potential applications for the biological control of TCD. Furthermore, results from this study contribute to the growing knowledge about the observed differential disease development between the western and eastern USA and could overall impact our understanding of TCD etiology.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
/
Trichoderma
/
Juglans
/
Gorgulhos
/
Ophiostoma
/
Micobioma
/
Hypocreales
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
País/Região como assunto:
America do norte
Idioma:
En
Revista:
Fungal Biol
Assunto da revista:
MICROBIOLOGIA
Ano de publicação:
2018
Tipo de documento:
Article