Assessment of genetic diversity in synthetic hexaploid wheats and their Triticum dicoccum and Aegilops tauschii parents using AFLPs and agronomic traits |
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Authors: | J Lage ML Warburton J Crossa B Skovmand SB Andersen |
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Institution: | (1) International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 México, D.F., Mexico;(2) Royal Veterinary and Agricultural University, Bülowsvej 17, 1870 Frederiksberg C, Denmark |
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Abstract: | Synthetic hexaploid wheats are of interest to wheat breeding programs, especially for introducing new genes that confer resistance
to biotic and abiotic stresses. A group of 54 synthetic hexaploid wheats derived from crosses between emmer wheat(Triticum dicoccum, source of the A and B genomes) and goat grass (Aegilops tauschii, D genome donor) were investigated for genetic diversity. Using the AFLP technique, dendrograms revealed clear grouping according
to geographical origin for the T. dicoccum parents but no clear groups for the Ae. tauschii parents. The geographical clustering of the T. dicoccum parents was also reflected in the dendrogram of their derived synthetic hexaploids. Diversity of the T. dicoccum parents and their derived synthetic hexaploids was further evaluated by measuring 18morphological and agronomic traits on
the plants. Clustering based on morphological and agronomic data also reflected geographical origin. However, comparison of
genetic distances obtained from AFLP and agronomic data showed no correlation between the two diversity measurements. Nevertheless,
similarities among major clusters with the two systems could be identified. Based on percentage of polymorphic markers, the
synthetic hexaploids had a considerably higher level of AFLP diversity (39%) than normally observed in cultivated hexaploid
wheat (12–21%). This suggests that synthetic hexaploid wheats can be used to introduce new genetic diversity into the bread
wheat gene pool.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Aegilops tauschii AFLPs agronomic traits genetic diversity synthetic hexaploid wheat Triticum dicoccum |
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