August
2008
, Volume
92
, Number
8
Pages
1,229
-
1,236
Authors
C.-G. Chu, Department of Plant Sciences, North Dakota State University, Fargo, ND 58105, USA;
S. S. Xu and
J. D. Faris, USDA-ARS, Northern Crop Science Laboratory, Fargo, ND 58105, USA;
E. Nevo, Institute of Evolution, University of Haifa, Mt. Carmel, Haifa 31905, Israel; and
T. L. Friesen, USDA-ARS, Northern Crop Science Laboratory, Fargo, ND 58105, USA
Affiliations
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Accepted for publication 18 December 2007.
Abstract
ABSTRACT
Tan spot and Stagonospora nodorum blotch (SNB), caused by Pyrenophora tritici-repentis and Stagonospora nodorum, respectively, are two destructive foliar diseases of wheat, causing significant yield reduction worldwide. The objective of this study was to evaluate 172 accessions of wild emmer wheat (Triticum dicoccoides) for seedling resistance to tan spot and SNB. All accessions were inoculated with P. tritici-repentis race 1 and a mixture of three diverse isolates of S. nodorum, respectively. The accessions were also evaluated for sensitivity to host-selective toxins (HSTs), including ToxA produced by both S. nodorum and P. tritici-repentis and culture filtrate produced by S. nodorum. A total of 34 accessions were resistant to tan spot, and 136 accessions were resistant to SNB. Among these accessions, 31 were resistant to both diseases. Significant correlations between HST insensitivity and disease resistance were observed. Our results showed that T. dicoccoides is a good genetic source of resistance to tan spot and SNB in wheat.
JnArticleKeywords
Additional keywords:Phaeosphaeria nodorum
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ArticleCopyright
The American Phytopathological Society, 2008
