ビワがんしゅ病に関する研究 : 第1報ビワがんしゅ病菌ファージの寄生性と形態

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Fifty one isolates of Pseudomonas eriobotryae phages were obtained from the canker-infected loquat plant (Eriobotrya japonica Lind.) which were collected from various localities of loquat cultivation areas in Japan. These phages originated from the blight-infected bud, from the halo lesions of the leaf, and from the canker twigs were designated as EP_1, EP_2, and EP_3 respectively. The phage particles of both EP_1 and EP_2 are tadpole-shaped, and consist of a polyhedral head attached with long tail. EP_1 phage has a head of 105 nm in diameter with a tail of 170 nm in length and 31 nm in width, while EP_2 phage consists of a head of 92 nm in diameter with a tail of 118 nm in length and 27 nm in width. On the other hand, the shape of EP_3 phage is much different from that of above two phages, and consists of a polyhedral head of 92 nm in diameter with an extremely short tail of 17 nm in length and 22 nm in width. Forty nine species (55 isolates) of pathogenic bacteria including 41 species of pseudomonads were tested on the susceptibility to each phages by means of the drop method. The host range of EP_1 phage was strictly specific for P. eriobotryae, while others were non-specific. EP_2 phage attacked P. ovalis and EP_3 phage attacked P. striafaciens, P. mori, and P. flura, besides P. eriobotryae. Most of the isolates of P. mori were susceptible to EP_3, but any kinds of P. mori phage did not attack P. eriobotryae isolates. All the 123 isolates of P. eriobotryae were classified on the bases of their susceptibility to EP_1, EP_2, and EP_3 phages as follows: strain I ; isolates which are susceptible to only EP_1 but not to EP_2 and EP_3 strain II ; isolates which are susceptible to only EP_2 but not to EP_1 and EP_3 strain III ; isolates which are susceptible to only EP_3 but not to EP_1 and EP_2 strain IV ; isolates which are susceptible to both EP_2 and EP_3 but not to EP_1 strain V ; isolates which are resistant to all of three phages These strains seem to be different in their distribution patterns: the isolates belonging to strain I and III were widely distributed in Japan, and those belonging to strain II and IV were found to be distributed only in the intensivly cultivated area in Nakasaki Prefecture.
日本植物病理学会の論文
1974-12-25

ビワがんしゅ病に関する研究 : 第1報ビワがんしゅ病菌ファージの寄生性と形態

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ビワがんしゅ病に関する研究 : 第1報 ビワがんしゅ病菌ファージの寄生性と形態

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ビワがんしゅ病に関する研究 : 第1報ビワがんしゅ病菌ファージの寄生性と形態