Journal article
Genetic relationships between race-nonspecific and race-specific interactions in the wheat–Pyrenophora tritici-repentis pathosystem
Theoretical and applied genetics, Vol.129(5), pp.897-908
05/2016
Handle:
https://hdl.handle.net/2376/118200
PMID: 26796533
Abstract
We identified a major QTL conferring race-nonspecific resistance and revealed its relationships with race-specific interactions in the wheat–
Pyrenophora tritici
-
repentis
pathosystem.
Tan spot, caused by the fungus Pyrenophora tritici-repentis (Ptr), is a destructive disease of wheat worldwide. The disease system is known to include inverse gene-for-gene, race-specific interactions involving the recognition of fungal-produced necrotrophic effectors (NEs) by corresponding host sensitivity genes. However, quantitative trait loci (QTLs) conferring race-nonspecific resistance have also been identified. In this work, we identified a major race-nonspecific resistance QTL and characterized its genetic relationships with the NE-host gene interactions Ptr ToxA-Tsn1 and Ptr ToxC-Tsc1 in a recombinant inbred wheat population derived from the cross between ‘Louise’ and ‘Penawawa.’ Both parental lines were sensitive to Ptr ToxA, but Penawawa and Louise were highly resistant and susceptible, respectively, to conidial inoculations of all races. Resistance was predominantly governed by a major race-nonspecific QTL on chromosome arm 3BL for resistance to all races. Another significant QTL was detected at the distal end of chromosome arm 1AS for resistance to the Ptr ToxC-producing isolates, which corresponded to the known location of the Tsc1 locus. The effects of the 3B and 1A QTLs were largely additive, and the 3B resistance QTL was epistatic to the Ptr ToxA-Tsn1 interaction. Resistance to race 2 in F1 plants was completely dominant; however, race 3-inoculated F1 plants were only moderately resistant because they developed chlorosis presumably due to the Ptr ToxC-Tsc1 interaction. This work provides further understanding of genetic resistance in the wheat-tan spot system as well as important guidance for tan spot resistance breeding.
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Details
- Title
- Genetic relationships between race-nonspecific and race-specific interactions in the wheat–Pyrenophora tritici-repentis pathosystem
- Creators
- Gayan Kariyawasam - Department of Plant Pathology North Dakota State University Fargo ND 58108 USAArron Carter - Department of Crop and Soil Science Washington State University Pullman WA 99164-6420 USAJack Rasmussen - Department of Plant Pathology North Dakota State University Fargo ND 58108 USAJustin Faris - USDA-ARS Cereal Crops Research Unit Northern Crop Science Laboratory Fargo 58102 USASteven Xu - USDA-ARS Cereal Crops Research Unit Northern Crop Science Laboratory Fargo 58102 USAMohamed Mergoum - Department of Crop and Soil Sciences University of Georgia 1109 Experiment St Griffin GA 30223 USAZhaohui Liu - Department of Plant Pathology North Dakota State University Fargo ND 58108 USA
- Publication Details
- Theoretical and applied genetics, Vol.129(5), pp.897-908
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- Springer Berlin Heidelberg; Berlin/Heidelberg
- Grant note
- ND02224; 2011-68002-30029 / National Institute of Food and Agriculture (http://dx.doi.org/10.13039/100005825)
- Identifiers
- 99900548470301842
- Language
- English
- Resource Type
- Journal article