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Diallel Analysis of Resistance to Air Pollutants in Alfalfa¹

The inheritance of resistance to air pollutants in alfalfa (Medicago sativa L.) was studied in two diallels in greenhouses at Beltsville, Md. Progenies were exposed to polluted ambient air that was cooled and moistened by a wet-pad cooling system, since such an environment appears to enhance pollution damage. Oxidants were often present at levels known to cause foliar damage in alfalfa. Other pollutants were not monitored. General combining ability constituted most of the genotypic variation indicating that resistant populations might be developed using simple recurrent selection, or recurrent full-sib family selection. Nonadditive genetic variation may be sufficient so that progress might also be made using hybridization. Maternal and reciprocal effects were relatively unimportant.

Key Words: Breeding • Ozone • Diallel • Medicago sativa L.

² Research agronomist and research geneticist, formerly Applied Plant Genetics Laboratory, now with Germplasm Resources Laboratory and Cell Culture and Nitrogen Fixation Laboratory, respectively; and research plant pathologist, Plant Stress Laboratory, ARS, USDA, BARC-West, Beltsville, MD 20705.

Received for publication October 18, 1976.