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Modification of Saponin Content of Alfalfa Through Selection¹

Progress in selection for both low and high saponin content in alfalfa (Medicago sativa L.) was achieved with chemical and biological assays. Results were characterized by interactions among varieties, crops, and saponin levels. Selections for saponin content significantly affected protein, and forage yield, but not fiber, fat, ash, N-free extract, or seed yield. There was a tendency for low-saponin selections to be lower in protein and higher in fiber and forage yield than the high-saponin selections, but interactions resulting in differences among varieties and crops preclude definite conclusions.

Key Words: Toxicity • Breeding • Genetics

² Researcb Agronomist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, Logan, Utah; and former graduate student, Utah State University (presently Professor of Biochemistry, Tunghai University, Taichung, Taiwan).

Received for publication March 13, 1971.