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Title of Journal: Mol Breeding

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Abbravation: Molecular Breeding

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Springer Netherlands

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DOI

10.1016/0039-6028(80)90516-6

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1572-9788

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Tan spot susceptibility governed by the Emphasis

Authors: Justin D Faris Nilwala S Abeysekara Phillip E McClean Steven S Xu Timothy L Friesen
Publish Date: 2012/05/29
Volume: 30, Issue: 4, Pages: 1669-1678
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Abstract

Wheat–tan spot interactions are known to have an inverse geneforgene relationship where pathogenproduced necrotrophic effectors are recognized by host sensitivity genes to cause susceptibility However broadspectrum racenonspecific resistance quantitative trait loci QTL that do not conform to the inverse geneforgene model have also been identified in this system Here we evaluated a population of wheat recombinant inbred lines derived from Salamouni resistant and Katepwa susceptible for reaction to two isolates of race 1 Pti2 and Asc1 and one isolate of race 2 86–124 which all produce the necrotrophic effector Ptr ToxA and the isolate AR LonB2 which does not produce Ptr ToxA and does not conform to the current race classification system As expected the Tsn1 locus was significantly associated with disease caused by all three ToxAproducing isolates and was not associated with tan spot caused by AR LonB2 However the amount of variation explained by Tsn1 varied considerably with values of 5 22 and 30  for Asc1 Pti2 and 86–124 respectively suggesting possible variability in ToxA gene regulation among these isolates A locus on chromosome arm 7DS was specifically associated with isolate AR LonB2 but explained only 8  of the variation Additional QTL on 5DL and 7BS were racenonspecific and associated with tan spot caused by multiple isolates These results provide further evidence that racenonspecific resistance QTL play important roles in governing reaction to tan spot and they suggest that the wheat–tan spot pathosystem is more complicated than previously thought The elimination of necrotrophic effector sensitivity genes and the addition of racenonspecific resistance loci are needed to develop wheat cultivars with high levels of tan spot resistanceThe authors thank Danielle Holmes and Jamie Hauff for technical assistance This research was supported by USDAARS CRIS project 54422200003300D Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture USDA is an equal opportunity provider and employer

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