Cereal Research Communications

, Volume 43, Issue 2, pp 179–188 | Cite as

Cytological, Phenological and Molecular Characterization of B (S)-Genome Synthetic Hexaploids (2n = 6x = 42; AABBSS)

  • A. Gul KaziEmail author
  • A. Rasheed
  • H. Bux
  • A. A. Napar
  • A. Ali
  • A. Mujeeb-Kazi


The B(S) genome diploids (2n = 2x = 14) are a unique reservoir of genetic diversity that can provide wheat breeders a rich source of allelic variation for stress traits that limit productivity. Restricted in practical use essentially due to their complex chromosomal behavior, these diploids have been in limited practical usage. The classic utilization example has been the suppression activity of the Ph locus and role in alien genetic transfer aspects that has been a standard in cytogenetic manipulation studies. For applied efforts focusing on Aegilops speltoides researchers in CIMMYT initiated an ambitious program to make AABBBB(SS) synthetics and made progress by generating over 50 such synthetics. Of these 20 were available for this study in which phenology and powdery mildew screening were evaluated. Four of these 20 synthetics appeared to be useful sources for further exploitation in breeding. These were entries 6, 9, 10 and 11 suited for exploitation in pre-breeding, with positive phenological characters particularly high thousand-kernel weight and are cytologically near euploid at 2n = 6x = 42. The subtle hyper (43) and hypoploid number would not negate their applied use potential. Preference however goes to genotypes 9 and 11.


Triticum aestivum phenology cytology fingerprinting 


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© Akadémiai Kiadó, Budapest 2015

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • A. Gul Kazi
    • 1
    Email author
  • A. Rasheed
    • 2
  • H. Bux
    • 3
  • A. A. Napar
    • 2
  • A. Ali
    • 4
  • A. Mujeeb-Kazi
    • 5
  1. 1.Atta-ur-Rahman School of Applied BiosciencesNational University of Sciences and TechnologyIslamabadPakistan
  2. 2.Crop Science Research Institute/National Wheat Improvement CentreChinese Academy of Agricultural Sciences (CAAS)BeijingPR China
  3. 3.Institute of Plant SciencesUniversity of SindhJamshoroPakistan
  4. 4.Center for Plant Sciences and BiodiversityUniversity of SwatSwatPakistan
  5. 5.International Wheat and Maize Improvement Center (CIMMYT)MexicoMexico

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