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Association mapping of resistance to tan spot in the Global Durum Panel

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Title Association mapping of resistance to tan spot in the Global Durum Panel
 
Creator Szabo-Hever, Agnes
Singh, Gurminder
Peters Haugrud, Amanda
Running, Katherine
Seneviratne, Sudeshi
Zhang, Zengcui
Shi, Gongjun
Bassi, Filippo
Maccaferri, Marco
Cattivelli, Luigi
Tuberosa, Roberto
Friesen, Timothy L
Liu, Zhaohui
Xu, Steven
Faris, Justin
 
Subject genetics
disease resistance
fungal pathogens
host parasite interactions
 
Description Tan spot, caused by the necrotrophic fungal pathogen Pyrenophora tritici-repentis (Ptr), is an important disease of durum and common wheat worldwide. Compared to common wheat, less is known about the genetics and molecular basis of tan spot resistance in durum wheat. We evaluated 510 durum lines from the Global Durum wheat Panel (GDP) for sensitivity to the necrotrophic effectors (NEs) Ptr ToxA and Ptr ToxB, and for reaction to Ptr isolates representing races 1–5. Overall, susceptible durum lines were most prevalent in South Asia, the Middle East, and North Africa. Genome-wide association analysis showed the resistance locus Tsr7 was significantly associated with tan spot caused by races 2 and 3, but not races 1, 4, or 5. The NE sensitivity genes Tsc1 and Tsc2 were associated with susceptibility to Ptr ToxC- and Ptr ToxB-producing isolates, respectively, but Tsn1 was not associated with tan spot caused by Ptr ToxA-producing isolates, which further validates that the Tsn1-Ptr ToxA interaction does not play a significant role in tan spot development in durum. A unique locus on chromosome arm 2AS was associated with tan spot caused by race 4, a race once considered avirulent. A novel trait characterized by expanding chlorosis leading to increased disease severity caused by the Ptr ToxB-producing race 5 isolate DW5 was identified, and this trait was governed by a locus on chromosome 5B. We recommend that durum breeders select resistance alleles at the Tsr7, Tsc1, Tsc2, and the chromosome 2AS loci to obtain broad resistance to tan spot.
 
Date 2023-05-18
2023-10-13T14:49:14Z
2023-10-13T14:49:14Z
 
Type Journal Article
 
Identifier Agnes Szabo-Hever, Gurminder Singh, Amanda Peters Haugrud, Katherine Running, Sudeshi Seneviratne, Zengcui Zhang, Gongjun Shi, Filippo Bassi, Marco Maccaferri, Luigi Cattivelli, Roberto Tuberosa, Timothy L Friesen, Zhaohui Liu, Steven Xu, Justin Faris. (18/5/2023). Association mapping of resistance to tan spot in the Global Durum Panel. Phytopathology.
0031-949X
https://hdl.handle.net/10568/132254
https://doi.org/10.1094/PHYTO-02-23-0043-R
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Publisher American Phytopathological Society
 
Source Phytopathology