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  • 1 International Maize and Wheat Improvement Center (CIMMYT) Apartado Postal 6-641 Mexico D. F. 06600 MEXICO
  • | 2 National Agricultural Research Center (NARC) Islamabad PAKISTAN
  • | 3 National Institute for Biotechnology & Genetic Engineering (NIBGE) Faisalabad PAKISTAN
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Bridge crosses utilizing the D genome synthetic hexaploids (SH), Triticum turgidum / Aegilops tauschii (2n = 6x = 42, AABBDD), are a potent means of improving bread wheat ( T. aestivum ) for biotic and abiotic stresses. The synthetic germplasm enables incorporation of the genetic diversity of T. turgidum cultivars together with the attributes of the Ae. tauschii accessions. In this research, SH wheats were screened for karnal bunt in Obregon, Mexico over six crop cycles and several SHs were earlier identified with an immune response. These SHs have unique Ae. tauschii accessions as parents. Phenologically descriptors and additional trait evaluations led us to develop a sub-set of the most desirable combinations for wheat breeding. The SH wheats are generally tall, late to mature, have good agronomic type, and are non-free threshing with a high 1000 kernel weight. All have a spring growth habit with several possessing multiple stress resistances. The resistance exhibited by SH wheats has been transferred into elite but KB susceptible bread wheat cultivars thus generating a new and unique genetic resource that can be readily exploited by conventional breeding programs.

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Cereal Research Communications
Language English
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1973
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ISSN 0133-3720 (Print)
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