ARS | Publication request: Reaction of selected accessions of Aegilops tauschii to wheat blast, 2011

Submitted to: Plant Disease
Publication Type: Abstract Only
Publication Acceptance Date: December 5, 2011
Publication Date: March 30, 2012
Repository URL: http://DOI:10.1094/PDMR06
Citation: Bockus, W.W., Cruz, C.D., Kalia, B., Gill, B.S., Stack, J.P., Pedley, K.F., Peterson, G.L., Valent, B. 2012. Reaction of selected accessions of Aegilops tauschii to wheat blast, 2011. Plant Disease. DOI: 10.1094/PDMR06.

Technical Abstract: The wheat pathotype of M. oryzae is not known to occur outside of South America. To prepare for possible introduction into the U.S., it is important to search for sources of resistance including resistance in relatives of wheat. Ten accessions of the D genome progenitor of wheat, Ae. tauschii, and two check winter wheat cultivars were vernalized and grown in the greenhouse. The wheat cultivars were Jagalene (resistant) and Everest (susceptible). The monosporic Brazilian isolate T-25 of M. oryzae (Triticumpathotype) was used for evaluation. This isolate was originally collected from wheat Tapejara at Sao Jorge do Ivai, Parana, in January, 1988. Severe disease occurred on the susceptible check wheat cultivar Everest indicating high levels of disease pressure. Two accessions of Ae. tauschii had wheat blast phenotypes statistically similar to Everest. However, three accessions were statistically similar to the resistance check Jagalene. They were accessions from Azergaijan, Tajikistan, and Armenia. Therefore, high levels of resistance to wheat blast occur in some accessions of Ae. tauschii. Whether these accessions contain gene(s) that are different from those present in hexaploid wheat needs further investigation.