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United States Department of Agriculture

Agricultural Research Service

Research Project: CEREAL RUST FUNGI: GENETICS, POPULATION BIOLOGY, AND HOST-PATHOGEN INTERACTIONS

Location: Cereal Disease Laboratory

Title: Physiologic specialization of Puccinia graminis f. sp. tritici in Kenya in 2011

Authors
item ROUSE, MATTHEW
item Wanyera, Ruth -
item JIN, YUE

Submitted to: Acarology International Congress Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: August 30, 2012
Publication Date: N/A

Technical Abstract: A total of 12 collections of Puccinia graminis f. sp. tritici were obtained from Kenya during 2011. Collections were made around Mount Kenya and in wheat growing areas southwest towards Nakuru in the Rift Valley. Four collections were made from the international stem rust screening nursery in Njoro. A total of 10 of the collections were viable and 12 single pustule isolates were derived. The single pustule isolates were inoculated onto the North American wheat stem rust differential set with two replications. The five single pustule isolates derived from the four collections from Njoro were race TTKST with virulence to stem rust resistance genes Sr24 and Sr31. Two single pustule isolates from two collections from Timau near Mount Kenya were race TTKSK with avirulence to Sr24 and virulence to Sr31. All other isolates were found to be race TTKST. The data suggest that race TTKST was the most widespread and prevalent race of P. graminis f. sp. tritici in Kenya in 2011 and that race TTKSK was present at a low frequency.

Last Modified: 8/19/2014
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