Abstract
The LrT gene for resistance to leaf rust present in the common wheat (T. aestivum L.) backcross line RL 6049, and originally derived from cv. Terenzio, was on chromosome 4B. It is on the long arm of this chromosome, 2.9 .+-. 1.3 crossover units from the centromere. It is independent of or loosely linked with Sr7a, a gene for stem rust resistance on the long arm of chromosome 4B. It is inherited independently of leaf rust resistance genes Lr1, Lr2a, Lr3, Lr10, Lr14b, Lr16, Lr17 and Lr18. Lrt was redesignated Lr30.