Abstract
Breeding for herbicide tolerance in grasses began at Loughgall in the late 1960s. One of the main factors which stimulated the programme was the realisation that there was genetic variation between and within plant species in the effects of herbicides upon them. This was followed by demonstrations that particular herbicides were more active against some grass species than against others. It could therefore be deduced that selective breeding should produce grasses with enhanced herbicide tolerance thereby creating a means of manipulating the composition of grass swards. Early work with perennial ryegrass (Lolium perenne) confirmed that it was feasible to select for paraquat tolerance. This was soon followed by equally successful selection programmes using the herbicides dalapon, aminotriazole and glyphosate in both amenity and agricultural grasses.
Published Version
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