ORCID Profile
0000-0002-7414-044X
Current Organisation
USDA Agricultural Research Service
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Publisher: Scientific Societies
Date: 07-2013
DOI: 10.1094/PDIS-02-12-0200-RE
Abstract: Wheat landraces provide a source of genetic variability for breeding. The emergence and spread of highly virulent races of the stem rust pathogen (Ug99 race group of Puccinia graminis f. sp. tritici) threaten wheat production globally. Spring wheat landraces were screened for resistance in eight field seasons at the Kenya Agricultural Research Institute, Njoro, where the Ug99 race group has become endemic. Accessions showing resistance in one season were retested and screened with molecular markers associated with resistance genes Sr2, Sr24, Sr36, and Lr34/Yr18 two height-reducing genes and a photoperiod insensitivity allele. Of 2,509 accessions tested, 278 were categorized as resistant based on results from at least two seasons. Of these resistant accessions, 32 were positive for one or more markers for Sr2, Sr36, Rht-B1b, or Rht-D1b, indicating that they do not fit the definition of “landrace” because these genes were likely introduced via modern breeding practices. Thus, 246 resistant “landrace” accessions were identified. Of countries with more than five tested accessions, Afghanistan, Iran, Portugal, Ethiopia, Uzbekistan, Greece, Tajikistan, Bosnia and Herzegovina, and Serbia had at least 10% of tested accessions that were resistant to the Ug99 race group. Future research will characterize the resistance to determine its novelty and incorporate novel genes into improved lines.
Publisher: Springer Science and Business Media LLC
Date: 19-08-2017
Publisher: Wiley
Date: 04-09-2018
DOI: 10.1111/PPA.12928
Publisher: Informa UK Limited
Date: 10-03-2022
Location: United States of America
No related grants have been discovered for John Bonman.