Chromosomal location of yellow rust resistance gene(s) in Triticum aestivum Lophopyrum elongatum substitution lines

A set of T. aestivum-L. elongatum substitution lines were studied on yellow rust resistance at seedling stage, inheritance of the resistance and ester ase-5 (Est5) analysis. The results demonstrated that L. elongatlen carried a new yellow rust resistance gene(s), which was dominant and located on chr omosome 3E of L. elongatum. The biochemical locus encoding Est-5 was also l ocated on chromosome 3E, and was tentatively named Est-E5, which was co-seg regant with the Yr gene(s) in wheat background. In addition, the transmissi on frequencies of chromosome 3E in 3A/3E and 3D/3E hybrids selfing were sig nificantly higher than that of chromosome 3E in 3B/3E hybrid, which was pro bably due to the difference on genetic relationships among A, B, D and E ge nomes.