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Outcrossing of Oat Plants (Avena sativa L.) Grown from Mutagen-Treated Seeds¹

The percent of outcrossing on oat plants from untreated and mutagen-treated seeds was determined from four experiments. The mutagens used were thermal neutrons and ethyl methanesulfonate.

The year-to-year percent outcrossing varied from 2.4 to 6.0 in the mutagen-treated populations and 0.5 to 2.4 in the checks. The mean outcrossing percents for all experiments were 4.0 and 1.4, in the mutagen-derived and check populations, respectively. Both mutagens, when applied in proper dosages, were equally effective in causing outcrossing.

² Agricultural Research Technician, Crops Research Division, ARS, USDA, and Assistant Professor of Agronomy, North Dakota State University, Fargo, North Dakota (formerly graduate assistant, Iowa State University), respectively.

Received for publication February 3, 1966.