期刊
PLANT PATHOLOGY
卷 51, 期 2, 页码 225-230出版社
WILEY-BLACKWELL
DOI: 10.1046/j.1365-3059.2002.00682.x
关键词
asparagus; defence responses; Fusarium crown and root rot; Fusarium oxysporum f. sp asparagi; systemic acquired resistance
The ability of nonpathogenic isolates of Fusarium oxysporum (npFo) 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 npFo exhibited a hypersensitive response and those subsequently inoculated with Foa displayed resistance. Induction of systemic resistance in npFo-treated plants led to significantly fewer necrotic lesions (P = 0.05) and reduced Foa disease severity compared with plants not treated with npFo. In hyphal-sandwich root inoculation experiments, activities of peroxidase and phenylalanine ammonia-lyase and lignin content were higher in npFo-treated plants and increased more rapidly than in npFo-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 npFo-treated plants but not for npFo-untreated plants. Thus, isolates of npFo may function as inducers of systemic acquired resistance (SAR) and defence responses against Foa invasion in A. officinalis.
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