Effect of acibenzolar-S-methyl and Saccharomyces cerevisiae on the activation of Eucalyptus defences against rust
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Data
2009-01-01
Autores
Boava, Leonardo Pires [UNESP]
Kuhn, Odair J.
Pascholati, Sergio Florentino
Di Piero, Robson M.
Furtado, Edson Luiz [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
CSIRO Publishing
Resumo
Tree defence mechanisms against the fungus Puccinia psidii were examined by comparing the activities of defence-related enzymes (chitinase, peroxidase and phenylalanine ammonia-lyase) of two Eucalyptus grandis x E. urophylla (urograndis) hybrids, previously classified as either susceptible to rust (VR hybrid) or moderately resistant to rust (C0 hybrid). Furthermore, the potential of disease control by artificial activation of host defences using either acibenzolar-S-methyl (ASM) or Saccharomyces cerevisiae extract was also investigated. Greenhouse inoculation trials revealed that the C0 hybrid had lower disease severity than the VR hybrid but following foliar applications of either ASM or S. cerevisiae extract treatment, disease severity (evaluated at 15 days after inoculation) was reduced in both hybrids. This enhanced resistance was associated with the induction of a hypersensitive reaction which appeared to be effective in controlling rust in both clones. The activity of all enzymes differed between clones and inducer treatment. The role of the defence-related enzymes in imparting resistance to eucalypt hybrids against rust is discussed.
Descrição
Palavras-chave
Myrtaceae rust
Como citar
Australasian Plant Pathology. Collingwood: Csiro Publishing, v. 38, n. 6, p. 594-602, 2009.