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Characterization of a New Race of Exserohilum turcicum Virulent on Corn with Resistance Gene HtN

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http://www.apsnet.org/publications/PlantDisease/BackIssues/Documents/1989Articles/PlantDisease73n02_151.pdf
 
Title Characterization of a New Race of Exserohilum turcicum Virulent on Corn with Resistance Gene HtN
 
Creator Thakur, R P
Leonard, K J
Jones, R K
 
Subject Genetics and Genomics
 
Description Isolates of a new race of Exserohilum turcicum collected from South Texas in 1986 were compared with isolates of race 1 and race 3 in inoculations of seedlings of corn inbred B37 and B37 backcross lines with Ht2, Ht3, and HtN in controlled environment chambers. The new race resembled race 3 except for its virulence on B37 HtN. Race 3 has the virulence formula Ht1, HtN /Ht2, Ht3. The new race is described as race 4 with the virulence formula Ht1/Ht2, Ht3, HtN. Both race 3 and race 4 were virulent on B37Ht3 at 22 C day/18 C night temperatures but were avirulent at 26 C day/22 C night. Leaf disks were cut from lesions of races 3 and 4 on plants grown under different light and temperature conditions and incubated in moist chambers in the laboratory to compare treatment effects on sporulation. For plants grown under full light (647 ?E·m-2·s-1) at 22 C day/18 C night temperatures or 26 C day/22 C night, sporulation was greater on B37 than on B37Ht3 or B37HtN. In lesions from plants grown at reduced light intensity, sporulation on B37 was significantly decreased, but sporulation by races 3 and 4 on B37Ht3 and by race 4 on B37HtN was significantly increased. The resistance of B37Ht2 to race 1 broke down at low light intensity
 
Publisher American Phytopathological Society
 
Date 1989
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/8090/1/PlantDis_73_2_151-155_1989.pdf
Thakur, R P and Leonard, K J and Jones, R K (1989) Characterization of a New Race of Exserohilum turcicum Virulent on Corn with Resistance Gene HtN. Plant Disease, 73 (2). pp. 151-155. ISSN 0191-2917