Abstract
In these experiments the inhibitory ability of 12 varieties ofNicotiana tabacum L. to potato virus Y was studied by means of drop serological precipitation method. In 11 varieties under study a correlation was found between field resistance and the inhibitory ability of sap. Varieties S 390/1, line 40, fixed A 1 exhibited low inhibitory ability of sap, lines Bel 61-10, R 3, Criolo and Burley N-15 were of medium inhibitory ability and high inhibitory ability was found in varieities Viržinský zlatý, line 37, A 5205 and R 1. The variety Viržinský zlatý, which is believed to be susceptible to potato virus Y was found to have high inhibitory ability. This was confirmed by inoculation of leavesChenopodium giganteumDon., determination of the number of lesions by the half leaf test, and determination of relative concentration of potato virus Y by means of serological drop method. None of the varieties under study showed extremely high inhibitory ability against potato virus Y.
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