Journal Article
Evaluation of leaf rust resistance from wheat chromosomal translocation lines [1993]
Dyck, P.L.; Friebe, B.;
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The genetic pool of effective sources of rust resistance used in wheat (Triticum aestivum L.) breeding includes related species. As part of a search for new sources of resistance, a group of radiation-induced rust-resistant wheat Agropyron intermedium [(Host) P.B.] derivatives originally developed by A. Wienhues were investigated. Resistance to leaf rust [Puccinia recondita Roberge ex Desmaz. f. sp. tritici (Eriks. and E. Henn) D.M. Henderson] was transferred to the spring wheat cultivar Thatcher. The inheritance of leaf-rust resistance was studied in F3 lines developed from the fifth backcross to Thatcher. A number of backcross lines with different types of resistance were selected and evaluated for rust reaction in greenhouse and field tests. RL6097 had gene Lr38 present in wheat A. intermedium T6DS.6DL-7Ai-2L chromosome translocation (where a 4.19-micrometer segment of the long arm of A. intermedium chromosome 7Ai-2 replaced a 1.45-micrometer segment of the long arm of wheat chromosome 6D) derived from translocation line T7 as identified by C-banding. The male transmission rate of this translocation was reduced. Although this line was highly resistant to leaf rust, its grain yield was low. None of the other backcross lines had A. intermedium chromatin. RL6093 had an unidentified gene for leaf rust resistance from addition line T2. Two genes, Lr3bg (RL6094) and Lr16 (RL6096), were obtained from T6. Adult-plant resistance to leaf rust was also transferred
from several of the translocation lines. This resistance may be different from that previously reported, and may have originated from the translocation lines' donor parent 'Heine IV'. Of the genes found, Lr38 may not be useful in wheat breeding because of the reduced yield of RL6097; however, the gene for seedling resistance in RL6093 and the adult-plant resistance in RL6095 should be useful
