Characterization of a New Race of Exserohilum turcicum Virulent on Corn with Resistance Gene HtN
OAR@ICRISAT
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Relation |
http://oar.icrisat.org/8090/
http://www.apsnet.org/publications/PlantDisease/BackIssues/Documents/1989Articles/PlantDisease73n02_151.pdf |
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Title |
Characterization of a New Race of Exserohilum turcicum Virulent on Corn with Resistance Gene HtN
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Creator |
Thakur, R P
Leonard, K J Jones, R K |
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Subject |
Genetics and Genomics
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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
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Publisher |
American Phytopathological Society
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Date |
1989
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Language |
en
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Rights |
—
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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 |
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