Premium
Induction of systemic disease resistance and pathogen defence responses in Asparagus officinalis inoculated with nonpathogenic strains of Fusarium oxysporum
Author(s) -
He C. Y.,
Hsiang T.,
Wolyn D. J.
Publication year - 2002
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1046/j.1365-3059.2002.00682.x
Subject(s) - biology , fusarium oxysporum , asparagus , inoculation , phenylalanine ammonia lyase , microbiology and biotechnology , plant disease resistance , officinalis , fusarium oxysporum f.sp. lycopersici , pathogen , germination , botany , horticulture , fusarium wilt , peroxidase , enzyme , biochemistry , gene
The ability of nonpathogenic isolates of Fusarium oxysporum (np Fo ) to induce systemic resistance and defence responses against subsequent challenge with a pathogenic strain of F. oxysporum f. sp. asparagi ( Foa ) was examined in Asparagus officinalis . In a split‐root experiment, roots inoculated with np Fo exhibited a hypersensitive response and those subsequently inoculated with Foa displayed resistance. Induction of systemic resistance in np Fo ‐treated plants led to significantly fewer necrotic lesions ( P = 0·05) and reduced Foa disease severity compared with plants not treated with np Fo . In hyphal‐sandwich root inoculation experiments, activities of peroxidase and phenylalanine ammonia‐lyase and lignin content were higher in np Fo ‐treated plants and increased more rapidly than in np Fo ‐untreated plants after Foa inoculation. Antifungal activity (inhibition of fungal spore germination and germ‐tube growth) from exudates of roots inoculated with Foa were observed for np Fo ‐treated plants but not for np Fo ‐untreated plants. Thus, isolates of np Fo may function as inducers of systemic acquired resistance (SAR) and defence responses against Foa invasion in A. officinalis .