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Paper Information

Journal:   SEED AND PLANT   September 2003 , Volume 19 , Number 2; Page(s) 2 To 2.


During 1997 to 1999, five races of T. laevis were reported from different parts of Iran. In the present investigation some new pathotypes of the pathogen which are new for Iran or for the world are reporting. Wheat spikes infected with T. laevis were collected from different areas. Teliospores obtained from a single spike were considered as an isolate. Teliospores of each isolate were used to inoculate seeds of differential cultivars. Infected seeds were grown in a bunt infection free field in Karaj, and at the harvesting time, percentage of infected spikes for each cultivar and isolate were assessed. The virulence factors in each isolate and the related races were determined. Ten isolates from Khosroshahr, Shirvan, Maragheh, Ardabil and Uromieh had nine new combinations of virulence factors, which had not been included in the previously published race determination tables, therefore these combinations are described as L-20 - L-28 pathotypes as follows: L-21, isolate No. 1 from Khosroshahr, virulent on genes Bt2, 3, 7, 8, 9; L-22, isolate No. 2 from Khosroshahr, virulent on genes Bt7, 8, 13; L-23, isolate No. 1 from Shirvan, virulent on genes Bt3, 4, 7; L-24, isolate No. 2 from Shirvan, virulent on genes Bt2, 3, 7, 8, 13; L-25, isolate No. 1 from Maragheh, virulent on genes Bt7, 9; L-20, isolate No. 2 from Maragheh, virulent on genes Bt7_ 8; L-26, isolate No. 1 from Ardabil, virulent on genes Bt2, 7, 9, 15; L-27, isolate No. 2 from Ardabil, virulent on genes Bt2, 3, 7, 8; L-28, isolates No. 1 and 2 from Uromieh, virulent on genes Bt3, 7, 8. Virulence frequencies of these new pathotypes for resistance genes Bt2, Bt3, Bt4, Bt7, Bt8, Bt9, Bt13 and Btl5 were 40%, 60%, 10%, 100%, 70%, 30%, 20% and 10%, respectively. As genes Btl and Bt6 are susceptible to races L-4 and L-17, previously reported in Iran, therefore genes Bt5, Bt10, Bt11, Bt12, Bt14 and Bt p are still resistant to the new pathotypes and races present in Iran.
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