メロンがんしゅ病病原放線菌の分類学的性質

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The pathogenic actin om ycete isolates causing root tumor of melon were characterized with morphological, cultural and physiological properties. The causal actinomycete had true mycelia, and the mycelial filaments tended to remain intact and was not fragmentary. The actinomycete did not produce sclerotia, pycnidia and sporangia, but it was characterized by formation of pseudosporangia. The spores were produced in chains on aerial mycelia. The color of mature sporulated aerial myceria was in the gray series. The spore surface was smooth, and morphology of the spore chains was retinaculum-apertum. Whole cell hydrolysates of the actinomycete contained LL-diaminopimelic acid (A_2pm) but not meso-A_2pm. Diagnostically important sugars were not detected. These results indicated that this causal actinomycete was belonged to cell wall type I, and to be assigned to the genus Streptomyces. The present pathogen was able to grow at the range of 15-40℃ and pH 4.5-10.0, with the best growth at 27-35℃ and pH 6.5-7.7. It utilized D-glucose and 13 other carbohydrates as the carbon sources but not D-mannitol, D-sorbitol, salicin and cellulose. The actinomycete was negative in melanoid pigment formation, xantine dissolution and hydrogen sulfide production, whereas it was positive in gelatin liquefaction, milk decomposition, starch hydrolysis, nitrate reduction and calcium malate dissolution. The highest concentration of NaCl to allow growth was 4 %. In comparison of ten physiological characteristics and the pathogenicity to melon, there was no Streptomyces species that were identical with the present actinomycete. As the result, the actinomycete causing root tumor of melon is Streptomyces sp.
日本植物病理学会の論文
1991-10-25

メロンがんしゅ病病原放線菌の分類学的性質

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