Cereal Research Communications
Volume/Issue:
Volume 34: Issue 4
Karnal bunt resistance in synthetic hexaploid wheats (SH) derived from durum wheat × Aegilops tauschii combinations and in some SH × bread wheat derivatives
Authors: A. Mujeeb-Kazi, G. Fuentes-Davilla 1 , Alvina Gul 3 , and Javed Mirza 2
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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
DOI:
https://doi.org/10.1556/crc.34.2006.4.259
Page Count:
1199–1205
Publication Date:
01 Dec 2006
Online Publication Date:
28 Mar 2007
Article Category:
Research Article
Restricted access

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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Cover Cereal Research Communications
Cereal Research Communications A Quarterly of the Cereal Research Non-Profit Ltd. Company
Print ISSN:
0133-3720
Online ISSN:
1788-9170
Keywords:
D genome; interspecific hybridization; karnal bunt resistance; Aegilops tauschii

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