Introgression of Diploid Wild Avena SPecies Into A.Sativa
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MacKey(l) has suggested that the success of crop plants such as wheat, oats and rice has been due to disomic polypioidisation that has combined the merits of both cross- and self-fertilising systems. The success of these crops may be due to the potential heterotic responses induced by fixed epistatic interactions in disomic polyploids Introgression of wild species into A.sativa via an amphioctoploid could enhance opportunities for evolutionary development and provide a pool of germplasm from which heterotic types could be extracted. Thomas and colleagues(2,3,4) have reported relatively stable octoploids derived from 2x/6x crosses. Diploid Avena accessions have been reported to carry genes for resistance to crown and stem rust, barley yellow dwarf virus, soil mosaic virus(5), powdery mildew and cereal cyst nematode(6). These wild rel tives may provide useful genetic variation for inducing epistatic interactions that are fixed in 2x/6x amphioctoploids.
KeywordsPowdery Mildew Seed Weight Stem Rust Test Weight Barley Yellow Dwarf Virus
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