Identification of New Sources of Resistance to Wheat Stem Rust in Aegilops spp. in the Tertiary Genepool of Wheat

Recent stem rust epidemics in eastern Africa and elsewhere demonstrated that wheat stem rust is a re-emerging disease posing a threat to wheat production worldwide. The cultivated wheat gene pool has a narrow genetic base for resistance to virulent races, such as races in the Ug99 race group. Wild r...

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Bibliographic Details
Published in:Frontiers in plant science 2018-11, Vol.9, p.1719
Main Authors: Olivera, Pablo D, Rouse, Matthew N, Jin, Yue
Format: Article
Language:English
Subjects:
disease resistance
genetic resources
Plant Science
tertiary genepool
Ug99
wild wheats
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Summary:Recent stem rust epidemics in eastern Africa and elsewhere demonstrated that wheat stem rust is a re-emerging disease posing a threat to wheat production worldwide. The cultivated wheat gene pool has a narrow genetic base for resistance to virulent races, such as races in the Ug99 race group. Wild relatives of wheat are a tractable source of stem rust resistance genes. species in the tertiary genepool have not been exploited to any great extent as a source of stem rust resistance. We evaluated 1,422 accessions of spp. for resistance to three highly virulent races (TTKSK, TRTTF, and TTTTF) of f. sp. . Species studied include . , and that do not share common genomes with cultivated wheat. High frequencies of resistance were observed as 977 (68.8%), 927 (65.2%), and 850 (59.8%) accessions exhibited low infection types to races TTKSK, TTTTF, and TRTTF, respectively. Contingency table analyses showed strong association for resistance to different races in several s spp., indicating that for a given species, the resistance genes effective against multiple races. Inheritance studies in selected accessions showed that resistance to race TTKSK is simply inherited.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2018.01719