THE INHERITANCE OF RESISTANCE TO PUCCINIA RECONDITA IN A GROUP OF COMMON WHEAT CULTIVARS

Abstract

The inheritance of seedling resistance to leaf rust (P. recondita Rob. ex Desm.) was studied in common wheat (T. aestivum L.) cultivars: Terenzio, Lageadinho, PI [plant introduction] 321999, PI 197249, CRIC 26809-68, CIRC 32125-70, 72 Hills 175 and Frontana. They have in common 2 complementary genes (LrT2 and LrT3) that give a variable type of leaf rust resistance. Gene LrT2 is the most effective gene. In the ''Thatcher'' background, resistance to stem rust in the adult plant stage apparently is associated with this gene. The previously reported gene from PI 58548 that gives a 2+ infection type apparently is the same as LrT2. ''Terenzio'' also carries Lr3 and Lr30 while PI 197249 has Lr3.