The heritability of efficiency in phosphorus utilization under deficiency stress was investigated using 6 bean families derived from crosses between selected efficient, moderately inefficient, and inefficient lines. Total plant dry weight (DW) was used as an index of efficiency. Epistasis, notably additive by additive and dominance by dominance gene effects, made imyor contributions to the efficiency in P utilization. Additive and dominance gene effects also made significant contributions. Estimates of broad sense heritability for total plant DW showed that efficiency in P utilization was a highly heritable trait. Narrow sense heritability estimates for total plant DW were high in all families studied.
Received for publication August 4, 1980. Research supported by the Oyo State of Nigeria Government and the College of Agricultural and Life Sciences, University of Wisconsin, Madison. This investigation is a portion of a thesis presented in partial fulfillment of the requirements for the PhD degree.
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Present address: Institute of Agriculture, Research and Training, P.M.B. 5029, Ibadan, Nigeria.