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Segregating generations from crosses of cultivated lettuce  (Lactuca sativa  L.) with wild lettuce  (L. saligna  L.) are affected by sterility and abnormal growth. Resistance to lettuce infectious yellows virus (LIYV) was, therefore, studied in crosses of previously reported LIYV-resistant (PI 261653) with LIYV-susceptible (PI 490999, PI 491000 and PI 491001)  L. saligna  accessions. Simple Mendelian ratios for resistance (measured as numbers of symptomless and symptomatic plants, and as number of symptomatic leaves per plant) to LIYV were not evident. PI 491001 had the fewest symptomatic plants and the fewest symptomatic leaves per plant. The potential value of  L. saligna  for development of LIYV-resistant cultivated lettuce will be discussed.

RESISTANCE OF WILD LETTUCE (LACTUCA SALIGNA L.) TO LETTUCE INFECTIOUS YELLOWS VIRUS