Loss of genetic diversity associated with selection for resistance to sorghum midge in Australian sorghum

Jordan, D. R., Tao, Y. Z., Godwin, I. D., Henzell, R. G., Cooper, M. and McIntyre, C. L. (1998) Loss of genetic diversity associated with selection for resistance to sorghum midge in Australian sorghum. Euphytica, 102 1: 1-7. doi:10.1023/A:1018311908636


Author Jordan, D. R.
Tao, Y. Z.
Godwin, I. D.
Henzell, R. G.
Cooper, M.
McIntyre, C. L.
Title Loss of genetic diversity associated with selection for resistance to sorghum midge in Australian sorghum
Journal name Euphytica   Check publisher's open access policy
ISSN 0014-2336
Publication date 1998
Sub-type Article (original research)
DOI 10.1023/A:1018311908636
Volume 102
Issue 1
Start page 1
End page 7
Total pages 7
Place of publication Dordrecht, Netherlands
Publisher Springer
Language eng
Abstract In recent years, hybrids with levels of resistance to sorghum midge (Stenodiplosis sorghicola Coquillett) have become available to Australian sorghum producers. These hybrids have been readily accepted to the extent that more than 80% of the sorghum growing area was planted to hybrids with some level of midge resistance by 1995. Since selection for resistance to sorghum midge is one of the primary objectives of Australian sorghum breeding programs, the relationship between resistance and genetic diversity was investigated. Genetic diversity and heterozygosity were assessed using restriction fragment length polymorphism analysis among 26 grain sorghum hybrids grown commercially in Australia. The genetic distances between each sorghum hybrid and a standard highly resistant hybrid were found to be strongly negatively correlated to hybrid midge resistance ratings (r = - 0.77, p < 0.001). In addition, the average heterozygosity of each hybrid was correlated with their midge resistance ratings (r = - 0.54, p < 0.01). The results indicate that the move to midge resistant hybrids has been associated with a narrowing of the genetic diversity and average heterozygosity of commercial sorghum hybrids. Repeated use of particular elite parent lines, linkage drag and genetic drift are likely to have contributed to this decline. This reduction in genetic diversity may have implications for the genetic vulnerability of sorghum in Australia and the rate of progress in breeding for yield.
Keyword Genetic diversity
Linkage drag
RFLP
Stenodiplosis sorghicola
Sorghum
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
 
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