گزارش نهایی طرح تحقیقاتی تعیین نژادهای فیزیولوژیک قارچ‭Tilletia laevis‬عامل بیماری سیاهک پنهان معمولی گندم در خراسان

Wheat is the Iran's most highly important food crop. Common bunt caused by Tilletia laevis is one of the most important diseases of wheat, after the rusts. Determination of physiologic races of this fungus is highly important in breeding programs and development of resistant varieties. The Isolates of the pathogen, were collected from naturally infected wheat spikes, ( 600 samples), from wheat growing areas. of_ Khorasan Province during growing season of 2000. Teliospores obtained from 11 single head selections of these samples, (each spike=one isolate), were inoculated on seeds of one set of winter wheat differentials "containing known resistance Bt genes". Local susceptible cultivar (Sardari) was also included as local check. The experiments were carried out under natural conditions during two consecutive year of 2000-2003 at the farm of Agricaltural Research Torogh Station. Artificially inoculated seeds of differentials were sown in the depth of 4cm in two lines with 1 meter length in the field. Based on the resistance or susceptibility reactions of differential varieties to 11 samples of T. laevis, five races: L1 , L3, L8 , L10 and L20, were identified.

Keywords:

گندم , گندم , سیاهک پنهان معمولی گندم , قارچ های بیماری زا , بیماری زا , آفت