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Inhibition of Cowpea Seedling Growth by Methionine Analogs¹

The effects of reported methionine analogs on seedling growth of cowpea (Vigna unguiculata L.) were studied. L-methionine-DL-sulfoximine (MS) was the most toxic, followed in order by ethionine, a-methyl methionine (MM), and norleucine. Application of methionine protected seedlings from the inhibitory effects of ethionine and MM. Simultaneous addition of lysine and threonine in nutrient solution did not inhibit seedling growth, while methionine at 300 ppm was partially inhibitory. Screening of 33,000 M₂ seedlings from ethylmethane sulfonate-treated seeds resulted in the recovery of one plant resistant to ethionine and one resistant to MM. The latter was not viable. Seeds produced from plants grown in nutrient solution plus 200 ppm methionine contained approximately 10% more protein, total methionine, and free methionine in comparison to seeds produced in the absence of exogenous methione.

Key Words: Protein quality • High-methionine mutants • Protein quantity • Vigna unguiculata L.

² Graduate assistant and assistant professor, respectively. The investigations reported were included in a thesis by D. W. Dessauer in partial fulfillment of the requirement for an MS degree.

Received for publication January 16, 1978.