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United States Department of Agriculture

Agricultural Research Service

Title: Novel Pyrenophora Tritici-Repentis Isolates from Arkansas Wheat.

Authors
item Ali, S. - PLNT PATH NDSU, FARGO, ND
item Cartwright, T. - UNIV ARK, FAYETTEVILLE,AR
item FRIESEN, TIMOTHY
item Rasmussen, J. - PLNT PATH NDSU, FARGO, ND
item Milus, G. - UNIV ARK, FAYETTEVILL AR

Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: May 1, 2003
Publication Date: June 1, 2003
Citation: ALI, S., CARTWRIGHT, T., FRIESEN, T.L., RASMUSSEN, J., MILUS, G. NOVEL PYRENOPHORA TRITICI-REPENTIS ISOLATES FROM ARKANSAS WHEAT. AMERICAN PHYTOPATHOLOGICAL SOCIETY ABSTRACTS. 2003. V. 93(6) p. S3.

Technical Abstract: Pyrenophora tritici-repentis, causal agent of tan spot of wheat, occurs in nature as multiple races based on ability to cause necrotic (nec+) and chlorotic (chl+) lesions on wheat differentials. Tan spot occurs in Arkansas, but the race structure in that population has not been investigated. Fifty-one single-spore isolates, obtained from diseased leaves in 2002, were identified to race. Twenty-eight isolates were race 1 (nec+ chl+), but 23 isolates produced a novel reaction consisting of nec- chl+ on ND495, Katepawa, and 6B365, and avirulence on Glenlea, Salamouni, and M-3. Additionally, 17 of the 23 isolates lacked ToxA. The 23 isolates appear to form a new race. The data indicate that P. tritici-repentis in Arkansas has similarities to and differences from races in other regions of the US. Additional collections from Arkansas wheat will be made in 2003 for further testing.

Last Modified: 9/10/2014
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