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Outcrossing in the Ryegrass (Lolium spp.) as Determined by Fluorescence Tests¹

Studies were conducted to determine the amount and distance of outcrossing between fluorescent and nonfluorescent strains of ryegrass. Both experimental spaced-plant conditions and grower seed fields were investigated.

There was substantially less crossing among plants grown in seed fields than in plots of spaced plants. Beyond 6 m from the border, outcrossing became negligible between all cultivars tested. Beyond 12 m from the border there was no evidence of crossing.

Key Words: Cross pollination • Seed • Fluorescence

² Former Assistant in Farm Crops, Oregon State University (now Assistant Professor in Crop Science, Michigan State University) and Associate Professor, Seed Laboratory, Oregon State University, Corvallis, 97331.

Received for publication June 5, 1969.

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