Location: Foreign Disease-Weed Science
2010 Annual Report
A nursery of diverse wheat cultivars obtained from the USDA regional germplasm collections was establish on location and approximately 272 cultivars were screened in the containment greenhouse for resistance to foliar and spike infection using one isolate of wheat blast. Results from foliar infection were inconclusive and did not correlate to spike resistance. Though no cultivars were totally resistant to spike infection, 28 cultivars had less than 10% infection and are currently being retested. This work supports the parent project Milestone 3.A.2, months 36, 48 and 60, to assess U.S. wheat germplasm for wheat blast resistance.
Separate experiments were conducted to determine the effect of dew period and conidial concentration on wheat infection. In addition, experiments to determine the effects of temperature and relative humidity on conidial survival were also conducted. These studies are relevant to parent program plan milestone 2.C.3, months 36 and 48, “If introduced, wheat blast could become established in the wheat growing areas of the U.S.”
A meeting was held in Florida attended by a scientist from ARS, The Brazilian Agricultural Research Corporation (EMBRAPA), the International Maize and Wheat Improvement Center, Mexico and University of Gottingen, Germany, to plan for an international workshop on wheat blast.
In May,2010, the 1st International Workshop- “Wheat Blast a Potential Global Threat to Wheat Production”, was held in Passo Fundo, Brazil resulting in a proposal to establish an international wheat blast consortium to facilitate the exchange of isolates, establishment of nurseries for germplasm testing in Brazil and Bolivia, and applying for international research funding to address the identified research priorities. Contacts were made to obtain isolates from Bolivia, Paraguay, Argentina, and Brazil. A second meeting was held in Brasilia with EMBRAPA administrators and attorneys to discuss procedures for working within Brazil’s Biodiversity laws, which have prevented us from obtaining new field isolates of the disease.