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Intra‐racial variation in Phytophthora infestans and adaptation to field resistance for potato blight
Author(s) -
CATEN C. E.
Publication year - 1974
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1974.tb01402.x
Subject(s) - phytophthora infestans , biology , blight , subculture (biology) , race (biology) , pathogen , horticulture , botany , cultivar , resistance (ecology) , agronomy , microbiology and biotechnology
SUMMARY Strains of Phytophthora infestans of the same race ( P 4 ) isolated from a range of R 0 potato varieties differed markedly in their rate of growth on agar but differences in growth rate were not related to variety of origin. Two isolates from each of the varieties Duke of York, Majestic and Arran Consul were grown for six successive subcultures on tubers of these three varieties. The six isolates differed in aggressiveness as shown by their growth on individual varieties. There was a marked difference in growth rate between alternate subcultures which is attributed to the use of too long an incubation period. Analysis of the data for subcultures 1, 3 and 5 revealed a significant interaction between isolates and varieties which reflected the enhanced growth of five of the isolates on the variety from which they had been obtained. Serial subculture on potato tubers of the same variety had no general or specific effect on the aggressiveness of the isolates. It is concluded that strains of P. infestans of the same race may be differentially adapted to the variety on which they are growing in the field. Differential interactions between pathogen biotypes and non‐immune hosts are considered to be widespread in host‐pathogen systems.