Search National Agricultural Library Digital Collections

NALDC Record Details:

Genetics of stem rust resistance in the spring wheat cultivar Thatcher and the enhancement of stem rust resistance by Lr34

Permanent URL:
http://handle.nal.usda.gov/10113/10579
File:
Download [PDF File]
Abstract:
Three recombinant inbred line populations from the crosses RL6071/Thatcher, RL6071/RL6058 (Thatcher Lr34), and Thatcher/RL6058, were used to study the genetics of stem rust resistance in Thatcher and TcLr34. Segregation of stem rust response in each population was used to determine the number of genes conferring resistance, as well as the effect of the leaf rust resistance gene Lr34 on stem rust resistance. The relationship between resistance in seedling and adult plants was also examined, and an attempt was made to identify microsatellite markers linked to genes that were effective in adult plants. In field plot tests at least three additive resistance genes segregated in the RL6071/RL6058 population, whereas two resistance genes segregated in the RL6071/Thatcher population. The presence of the gene Lr34 permitted the expression of additional stem rust resistance in Thatcher-derived lines both at the seedling and adult plant stages. Seedling resistance to races TPMK and RKQQ was significantly associated with resistance in adult plants, whereas seedling resistance to races QCCD and QCCB may have made a minor contribution. The seedling resistance genes Sr16 and Sr12 may have contributed to resistance in adult plants. A molecular marker linked to resistance in adult plants was identified on chromosome 2BL.
Author(s):
Vanegas, Carmen D. Gavin , Garvin, David F. , Kolmer, James A.
Subject(s):
stems , Triticum aestivum , spring wheat , cultivars , disease resistance , rust diseases , Puccinia graminis , genes , gene segregation , seedlings , chromosome mapping , genetic markers , microsatellite repeats , mature plants
Format:
p. 391-401.
Note:
Includes references
Source:
Euphytica 2008 Feb., v. 159, no. 3
Language:
English
Publisher:
Dordrecht : Springer Netherlands
Year:
2008
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.