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Protein Contents, Grain Weights, and Breeding Potential of Wild and Domesticated Tepary Beans¹

Protein contents and 1,000 grain weights of wild and domesticated tepary beans (Phaseolus acutifolius A. Gray) were compared with values for domesticated common beans (P. vulgaris L.). The wild teparies tested had significantly higher mean protein values, but significantly lower grain weights than the domesticated teparies. Domesticated teparies had a larger range of protein values than the wild teparies. Wild and domesticated teparies had significantly lower mean protein contents and much lower mean grain weights than the cultivars of P. vulgaris tested. Only in cultivars of common bean were protein content and grain weight significantly negatively correlated. Teparies may have potential for breeding and for interspecific hybridization to transfer drought tolerance, heat resistance, ozone-smog tolerance, narrow leaves, and disease resistance from teparies to common beans.

Key Words: Phaseolus acutifolius • Phaseolus vulgaris • Domestication • Drought tolerance • Heat tolerance • Smog tolerance • Disease resistance

² Assistant professor of genetics.

Received for publication September 9, 1977.