Inheritance of tolerance to barley yellow dwarf virus in oats

Advanced generation random lines from crosses f tolerant x susceptible parents were studied to determine the inheritance of tolerance to barley yellow dwarf virus (BYDV) in oats Avena sativa L. Clintland 64, a susceptible oat cultivar, was crossed with the BYDV tolerant oat lines Otee, FF64/74, M921 and CI4492. Randomly selected lines were advanced to F5 or F6 by single seed descent and were tested for their reaction to BYDV at Palmerston North, New Zealand and Winnipeg, Manitoba and Ste-Foy, Quebec, Canada. The correlation between the three sites was significant for all crosses, ranging from 0.36 to 0.69, according to the particular cross considered. This correlation is sufficient to justify more international testing of oats for BYDV tolerance.