Extracts of Red Kidney bean seeds, untreated or treated by boiling or by irradiation with sunlight, inhibited germination and growth in flax, wheat, and other test plants. Irradiation activated, and boiling inactivated, certain extracts. Only aqueous extracts were effective; only visible light increased inhibitory activity. The varying properties of extracts from different parts of the bean seed suggest that more than one inhibiting principle is present.
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S. M. Siegel (1950) studied this question.