Measurement of outcrossing in Lolium spp. as determined by fluorescence tests Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pc289m55m

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  • Research was conducted to determine the distance and amount of outcrossing between varieties of highly fluorescent annual ryegrass (Lolium multiflorum Lam.) and low-fluorescing perennial ryegrass (Lolium perenne L.). Studies were conducted under both spaced-plant and seed production field conditions. Fluorescence tests on seed collected from low-fluorescing perennial ryegrass at successive distances from the fluorescent annual ryegrass pollen source revealed that outcrossing was considerably less than that reflected by present certification isolation distances. Outcrossing under spaced plant situations decreased rapidly and became minimal at a distance of 100 feet. Crossing between adjacent high-density fields was substantially below that revealed between space-planted ryegrass. Under field conditions, outcrossing became negligible after about ten feet, and no evidence of crossing was observed at distances greater than 40 feet.
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