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Reactions of potato cultivars to Synchytrium endobioticum and implications for minimum tuber numbers in wart susceptibility tests
Author(s) -
BROWNING I. A.
Publication year - 1996
Publication title -
eppo bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.327
H-Index - 36
eISSN - 1365-2338
pISSN - 0250-8052
DOI - 10.1111/j.1365-2338.1996.tb01539.x
Subject(s) - cultivar , biology , horticulture , sporangium , root crops , botany , spore
Results of wart susceptibility tests on cultivars submitted for UK National List Trials in 1984/1994 are analysed. In cultivars classified as Resistance Group 2 (RG2), the percentage of individual tubers giving RG2 reactions ranged from 1.5 to 76. For most such cultivars (87%), less than 50% of tubers gave RG2 reactions. The percentage of tubers giving susceptible reactions in cultivars classified as susceptible ranged from 10 to 100. For most susceptible cultivars (87%) , more than 60% of tubers reacted as susceptible. It is suggested that slightly susceptible cultivars in which 10‐21% of tubers react as susceptible are likely to produce numerous winter sporangia but no wart tissue when grown in infested soil. Those in which > 67% of tubers react as susceptible are likely to produce varying quantities of wart tissue. There was no cultivar in which 22–62% of tubers gave susceptible reactions, indicating a possible natural break in the spectrum between slightly susceptible cultivars and those which produce wart tissue. It is suggested, on the basis of the evidence available. that the number of tubers per cultivar used for susceptibility testing could safely be reduced for most cultivars.