馬鈴薯の疫病抵抗性に関する研究 : II.疫病菌新系統の発生と馬鈴薯種間雑種の自然発病の様相について

概要

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Field infection of 15 demissulee-hydrids and progeny of 48005-3 x Voran has heen observed In parallel with artificial inoculation test with common strain of Phytophthora ilefestans in 1954. Among 15 deinissum-hybrids, four seedling varieties, viz. 529-1, 48005-46, 48005-59 and 48005-83 were found to have lower resistance to P. infesta,es through the artificial inoculation on leaves with common strain H_1 These seedling varieties with the exception of 529-1 gave varying degrees of field infection and it has been observed that the infection was due to the appearance of new pathogenic strain H_2. As to the seedlings of 48005-3XVoran the same result was obtained ; those resistant to strain Hi became spontaneously iufected by late August, showing. quite various degrees of infection. The variation in the degree of field infection may be partly due to the so called partial resistance and since little is known on the nature of partial resistance further study will be required in order to clarify the problem of endless host-parasite competition.
日本育種学会の論文
1956-06-30