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Gain of Virulence Caused by Insertion of a Pot3 Transposon in a Magnaporthe grisea Avirulence Gene

May 2001 , Volume 14 , Number  5
Pages  671 - 674

Seogchan Kang , Marc Henri Lebrun , Leonard Farrall , and Barbara Valent

DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880-0402, U.S.A.

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Accepted 10 January 2001.

The avirulence gene AVR-Pita in Magnaporthe grisea prevents the fungus from infecting rice cultivars carrying the disease resistance gene Pi-ta. Insertion of Pot3 transposon into the promoter of AVR-Pita caused the gain of virulence toward Yashiro-mochi, a rice cultivar containing Pi-ta, which demonstrated the ability of Pot3 to move within the M. grisea genome. The appearance of Pot3 in M. grisea seems to predate the diversification of various host-specific forms of the fungus.

Additional keywords: Pyricularia grisea ; race variation.

© 2001 The American Phytopathological Society