Novel resistance to pre-harvest sprouting in Australian wheat from the wild relative Triticum tauschii |
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Authors: | KT Gatford P Hearnden F Ogbonnaya RF Eastwood GM Halloran |
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Institution: | (1) Dept. Crop Production, ILFR, The University of Melbourne, Parkville, VIC, 3052, Australia;(2) Cooperative Research Centre for Molecular Plant Breeding, Joint Centre for Crop Innovation, VIDA, Private Bag 1, Horsham, VIC, 3401, Australia |
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Abstract: | The diploid D-genome progenitor of hexaploid wheat, Triticum tauschii (Coss.) Schmahl., was screened to identify mechanisms for resistance to pre-harvest sprouting. A number of promising mechanisms
were identified, and transferred to hexaploid wheat via wide-hybridisation. One identified mechanism, an inhibitory phenolic
compound present in the bracts surrounding the grain, has been shown to function effectively in synthetic hexaploid wheats.
A number of seed-borne dormancy mechanisms were also identified. Expression of embryo dormancy in synthetic hexaploid wheats
was demonstrated when compared with non-dormant hexaploid wheat. Effects of the seed coat on dormancy were also studied, with
the seed coat of synthetic hexaploids accelerating rather than inhibiting germination. Embryo dormancy was also demonstrated
in two `direct-cross' hybrids. The results suggest that a combination of the described mechanisms may produce white wheats
with resistance to pre-harvest sprouting adequate for most Australian climatic conditions.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | dormancy pre-harvest sprouting wheat |
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