Changes in the susceptibility of mulberry leaves applied differing amounts of fertilizer to phytopathogenic fungi.
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Changes in the susceptibility of mulberry leaves to phytopathogenic fungi by applying varying amounts of fertilizer to the plants were studied. The fertilized leaves of two cultivars were inoculated with two strong pathogenic fungi, Colletotrichum dematium and Myrothecium roridum M9403, and four weak pathogenic fungi, C. acutatum, Glomerella cingulata, Fusarium solani and M. roridum M9623. Susceptibility to weak pathogenic isolates of a susceptible cultivar (cv. Ochii) and a recommended cultivar (cv. Shin-ichinose) tended to increase proportionately to the amount of fertilization, suggesting that excessively-fertilized plants are more liable to suffer fungal infection of the leaves. Although every leaf of cv. Ochii was susceptible to the strong pathogenic isolates regardless of the amount of fertilizer applied, the susceptibility of cv. Shin-ichinose leaves increased as they were fertilized both excessively and deficiently. Hence, appropriate fertilization can reduce the occurrence of the disease caused by phytopathogenic fungi, even those fungi having strong pathogenicity. When phytoalexins induced in the leaves grown in each strength of fertilized soil were extracted and quantified using TLC-bioassay methods, the amount of phytoalexins increased as less fertilizer was applied. This change of phytoalexins amount tended to coincide with the degree of resistance of the leaves against weak pathogenic isolates. Thus, phytoalexins induced in the leaves may function as a resistant factor against weak pathogens.
- 社団法人 日本蚕糸学会の論文
社団法人 日本蚕糸学会 | 論文
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