Study on the virulence factors of Tilletia laevis Kuhn andTilletia controversa Kuhn in different dryland areas
2004
Hassanpour Hosni, Magsoud | Mardoukhi, Vafa | Ghasemi, Mohammad Taghi | Bahrami Kaman Gir, Saman | Keshavarz, Kavous | Jaffari, Hossain | Nourallahi, Khoshnood | Roustaei, Mozaffar | Torabi, Mohammad
In order to determine the virulence factors of Tilletia laevis Kuhn and T. controversa Kuhn (the causal agents of common and dwarf bunt of wheat) in different dryland areas of Iran, this trial was conducted at Maragheh, Kordestan, Gachsarn, Zanjan and Ilam for three years. Seeds of differential monogenic and oligogenic lines were artificially infected with teliospores of T. laevis and T. controversa separately, then planted in field. At harvesting time, percentage of infected spikes was assessed for each line and the percent of infection were determined. According to the results, T. controversa, was not virulent on resistant gene(s) Bt1, Bt5, Bt8, Bt9, BtP and compound genes Bt(8,9,10) and Bt(3,7,8) from winter type lines. The agent of common bunt (T. laevis) was not virulent on gene(s) Bt10 (from spring type lines) and Bt4, Bt6, Bt10, Bt11, BtP, and compound genes Bt(8,9,10). The infection percent of lines that containing that gene(s) were less than 10% at all locations. The infection percent of dwarf bunt on commercial cultivars (Azar2, Sardari and Sabalan) was 16-41-40 respectively, and the infection percent of common bunt on those commercial cultivars, was 15-30-32 respectively.These resistant gene(s) are suitable to use in wheat breeding program and, to produce resistant cultivars to common and dwarf bunt of wheat.
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