Dominant male-sterile populations for association mapping and introgression of exotic wheat germplasm
E. L. Heffner A , O. Chomdej A B , K. R. Williams A and M. E. Sorrells A CA Department of Plant Breeding and Genetics, Cornell University, 240 Emerson Hall, Ithaca, NY 14853-1902, USA.
B Current address: Centre for Agricultrural Biotechnology, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
C Corresponding author. Email: mes12@cornell.edu
Australian Journal of Agricultural Research 59(5) 470-474 https://doi.org/10.1071/AR07221
Submitted: 14 June 2007 Accepted: 27 February 2008 Published: 12 May 2008
Abstract
The introgression of exotic wheat germplasm such as synthetic hexaploid (tetraploid × diploid amphiploid) wheat (Triticum aestivum L.) into an adapted gene pool has the potential to amplify the genetic variation for complex traits. The dominant male-sterile gene can be used to facilitate recurrent selection in wheat, thus increasing the opportunity for genetic recombination between exotic and cultivated genomes and the identification and retention of desirable alleles. Our dominant male-sterile recurrent selection project began in 1983 with the intermating of the source germplasm (Chris hard red spring wheat in Triticum tauschii cytoplasm) with 34 soft winter lines and varieties, intermated without selection for 3 generations, and then selecting male-sterile plants for agronomic type each season. After 20 generations of recurrent selection, we extracted 94 inbred lines without selection during inbreeding except for fertility. Those lines were evaluated for linkage disequilibrium (LD) on the 5A chromosome for comparison with an earlier study involving 95 elite soft winter wheat varieties of similar genetic background. For the male-sterile population-derived lines, LD decayed within 1 cM (r2 < 0.1) compared with 5 cM in the previous report for soft winter wheat varieties. This approach to introgression facilitates the potential use of synthetic wheat and other unadapted germplasm for expanding the gene pool and provides a potential resource for high-resolution association mapping of genes controlling traits of interest.
Additional keywords: Triticum aestivum L., synthetic wheat, QTL mapping, recurrent selection.
Acknowledgments
The authors thank Dr Gael Pressoir for his discussions and insights during this project. Financial support was provided by USDA Hatch Project 149419, USDA CSREES National Research Initiative grant 35301–15728, the International Institute of Education Fulbright program, USDA National Needs Fellowship grant, and a Cornell Fellowship.
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