Abstract
lNDEX WORDS Phaseolus vulgaris, field bean, low temperature, nastic, inheritance, leaves. SUMMARY The interaction of suboptimal temperatures with light on the normal photonastic movement of the unifoliate leaf of cultivars and progeny derived from crosses of the common bean (Phaseolus vulgaris) was studied. Nastic movements are normally inhibited by a temperature of 10':'C, but tolerance permits the normal orientation of the leaf-blade to the light. Analysis of data from parental, F1, and F 2 populations of two sensitive and one tolerant cultivar indicated that this trait was controlled by two major genes. Tolerance appeared to be due to two pairs of recessive genes. The intolerant reaction was due to either one, or both, of the dominant alleles, one of which was epistatic to the second and similar in response. It is suggested that early growth could be improved by selection for photonastic response at low temperature.
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