Spot form of net blotch resistance in barley is under complex genetic control

Wang, Xuemin, Mace, Emma S., Platz, Gregory J., Hunt, Colleen H., Hickey, Lee T., Franckowiak, Jerome D. and Jordan, David R. (2015) Spot form of net blotch resistance in barley is under complex genetic control. Theoretical and Applied Genetics, 128 3: 489-499. doi:10.1007/s00122-014-2447-z


Author Wang, Xuemin
Mace, Emma S.
Platz, Gregory J.
Hunt, Colleen H.
Hickey, Lee T.
Franckowiak, Jerome D.
Jordan, David R.
Title Spot form of net blotch resistance in barley is under complex genetic control
Journal name Theoretical and Applied Genetics   Check publisher's open access policy
ISSN 0040-5752
1432-2242
Publication date 2015-03-01
Year available 2015
Sub-type Article (original research)
DOI 10.1007/s00122-014-2447-z
Open Access Status Not yet assessed
Volume 128
Issue 3
Start page 489
End page 499
Total pages 11
Place of publication Heidelberg, Germany
Publisher Springer Verlag
Language eng
Subject 1305 Biotechnology
1102 Agronomy and Crop Science
1311 Genetics
Abstract Evaluation of resistance to Pyrenophora teres f. maculata in barley breeding populations via association mapping revealed a complex genetic architecture comprising a mixture of major and minor effect genes. In the search for stable resistance to spot form of net blotch (Pyrenophora teres f. maculata, SFNB), association mapping was conducted on four independent barley (Hordeum vulgare L.) breeding populations comprising a total of 898 unique elite breeding lines from the Northern Region Barley Breeding Program in Australia for discovery of quantitative trait loci (QTL) influencing resistance at seedling and adult plant growth stages. A total of 29 significant QTL were validated across multiple breeding populations, with 22 conferring resistance at both seedling and adult plant growth stages. The remaining 7 QTL conferred resistance at either seedling (2 QTL) or adult plant (5 QTL) growth stages only. These 29 QTL represented 24 unique genomic regions, of which five were found to co-locate with previously identified QTL for SFNB. The results indicated that SFNB resistance is controlled by a large number of QTL varying in effect size with large effects QTL on chromosome 7H. A large proportion of the QTL acted in the same direction for both seedling and adult responses, suggesting that phenotypic selection for SFNB resistance performed at either growth stage could achieve adequate levels of resistance. However, the accumulation of specific resistance alleles on several chromosomes must be considered in molecular breeding selection strategies.
Formatted abstract
Key message

Evaluation of resistance to Pyrenophora teres f. maculata in barley breeding populations via association mapping revealed a complex genetic architecture comprising a mixture of major and minor effect genes.

Abstract

In the search for stable resistance to spot form of net blotch (Pyrenophora teres f. maculata, SFNB), association mapping was conducted on four independent barley (Hordeum vulgare L.) breeding populations comprising a total of 898 unique elite breeding lines from the Northern Region Barley Breeding Program in Australia for discovery of quantitative trait loci (QTL) influencing resistance at seedling and adult plant growth stages. A total of 29 significant QTL were validated across multiple breeding populations, with 22 conferring resistance at both seedling and adult plant growth stages. The remaining 7 QTL conferred resistance at either seedling (2 QTL) or adult plant (5 QTL) growth stages only. These 29 QTL represented 24 unique genomic regions, of which five were found to co-locate with previously identified QTL for SFNB. The results indicated that SFNB resistance is controlled by a large number of QTL varying in effect size with large effects QTL on chromosome 7H. A large proportion of the QTL acted in the same direction for both seedling and adult responses, suggesting that phenotypic selection for SFNB resistance performed at either growth stage could achieve adequate levels of resistance. However, the accumulation of specific resistance alleles on several chromosomes must be considered in molecular breeding selection strategies.
Keyword Agronomy
Plant Sciences
Genetics & Heredity
Horticulture
Agriculture
Plant Sciences
Genetics & Heredity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2016 Collection
 
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Created: Tue, 10 Mar 2015, 10:38:21 EST by System User on behalf of Qld Alliance for Agriculture and Food Innovation