Masanori Inagaki, Bilal Humeid, Sawsan Tawkaz, Ahmed Amri


A total of 400 accessions of Aegilops tauschii Coss. (goat grass) collected from western Asia and the Caucasus were screened for the productive tillering capacity under rain-fed field conditions with the aim of developing new, synthetic hexaploid wheats having enhanced drought adaptation. Of these, 23 Ae. tauschii accessions were selected for interspecific crossing with two durum wheat varieties ‘Belikh-2’ and ‘Jennah Khetifa’. Fifteen of the selected accessions were of Pakistani origin and exhibited early ear-emergence and low cross-compatibility, and five accessions were from Iran and Turkmenistan and exhibited high cross-compatibility. A wide variation among accessions in cross-compatibility might be related to their region of origin. Successful hybridization resulted in the formation of immature embryos, which are capable of regenerating to plants on culture medium. The Ae. tauschii accession ig 47219, of Turkmenistan origin, gave the highest frequency of embryos in crosses with both wheat varieties, but regeneration from the crosses with ‘Belikh-2’ failed due to the occurrence of hybrid necrosis. Thus, a high frequency of embryo production did not always result in the satisfactory development of hybrid plants. Treatment of the hybrid plants with colchicine was essential for the successful set of hexaploid seeds on the newly-synthesized plants. These constraints were discussed for the efficient development of new, synthetic hexaploid wheats.


Triticum aestivum, T. turgidum, Aegilops tauschii, drought, synthetic wheat, cross-compatibility, hybrid necrosis, pre-breeding.

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Journal of Plant Breeding and Genetics
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