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Use of Self-fertility in the Improvement of Bromus inermis and Phleum pratense¹

Experimental populations of Bromus inermis Leyss. and of Phleum pratense L. have been formed either with nearly self-sterile plants or with plants possessing modest levels of self-fertility. Both groups within a species originated from the same population and were submitted to the same selection pressures for agronomic features and disease resistance. Experimental synthetics based upon plants with a modest level of self-fertility have indicated some superiority in disease resistance and a possible yield advantage over combinations of self-sterile plants. Seedset data after mutual- and open-pollination suggest that self-fertile plants form more seed than self-sterile plants.

Key Words: Self-sterility • Grass breeding • Timothy • Smooth bromegrass

² Professor of Agronomy, Wisconsin Agricultural Experiment Station, and Geneticist (deceased), Crop Res. Div., ARS, USDA.

Received for publication March 24, 1969.