Tan‐Spot Resistance Screening ofAegilopsSpecies

摘要

AbstractTwo hundred and twelve accessions of 8 diploid and 10 polyploid species ofAegilopswere evaluated for resistance to tan‐spot disease of wheat, caused byPyrenophora tritici‐repentis(Died.) Drechs., under greenhouse conditions. One or more accessions ofAe. bicornis, Ae. biuncialis, Ae. Crassa, Ae. columnaris, Ae. cylindrica, Ae. speltoides, Ae. squarrosa. Ae. triaristata. Ae. triuncialis, andAe. Ovatashowed resistance following a 24‐hour post‐inoculation wet period. With a 36‐hour wet period, diploids became only slightly or moderately susceptible and resistant polyploids became susceptible. A 48‐hour wet period resulted in still greater susceptibility of both diploid and polypl