Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/31/1998
Publication Date: N/A
Citation: BROWN GUEDIRA,G.L., COX,T.S., GILL,B.S., SEARS,R.G., REGISTRATION OF KS96WGRC35 AND KS96WGRC36 LEAF RUST-RESISTANT HARD RED WINTER WHEAT GERMPLASMS, CROP SCIENCE, 1998. Interpretive Summary: Leaf rust occurs in all major wheat-producing areas of the United States and is capable of causing large losses of yield when infection is heavy. To slow the development of new races of the fungus that are able to attack resistant cultivars, wheat breeders need a large supply of new resistance genes. Many strains of the wild relatives of wheat have genes for resistance to leaf rust. We used two strains of the wild relative, Triticum timopheevii subsp. aremeniacum, to pollinate susceptible hard winter wheat cultivars. We then used backcrossing to transfer two new genes for resistance to leaf rust into germplasm lines KS96WGRC35 and KS96WGRC36. These genes should be useful to wheat breeders who are developing leaf rust-resistant cultivars.
Technical Abstract: New leaf rust-resistance genes in agronomically adapted backgrounds are needed in the hard winter wheat region. KS96WGRC35 and KS96WGRC36 are hard red winter wheat germplasms resistant to leaf rust. Seedlings of KS96WGRC35 and KS96WGRC36 exhibited low infections types (; to 2) when inoculated with five cultures of leaf rust. High infection types (3 to 4) were observed on both germplasms when inoculated with leaf rust races MBR-10, PNM-10, and PNM-10, 18. Adult plants of KS96WGRC35 and KS96WGRC36 had low infection types (;) under heavy leaf rust infections in the field at Manhattan and Hutchinson, KS, in 1995 and 1997. KS96WGRC35 is a BC2F3-derived line with the pedigree Wrangler*3/TA 28. KS96WGRC36 is a BC3F3-derived line with the pedigree TAM 107*4/TA 870. TA 28 and TA 870 are leaf rust-resistant accessions of Triticum timopheevii (Zhuk.) Zhuk. subsp. armeniacum (Jakubz.) van Slageren from northern Iraq. Leaf rust resistance in each germplasm is conditioned by single partially dominant genes from the T. timopheevii parent, and the two genes segregated independently of each other.