Mature plant resistance of potato against some virus diseases. I. Concurrence of development of mature plant resistance against potato virus X, and decrease of ribosome and RNA content

Four of five weeks after planting a group of potato plants ‘Bintje’ was inoculated with potato virus X (PVX). Other groups were inoculated at intervals of 14 days. Tubers produced by plants inoculated 35 days after planting were all infected. The plants inoculated 49 days or later after planting produced few infected tubers. The latter had developed mature plant resistance against PVX infection.