Intraspecific Differences in Growth of Beans at Stress Levels of Phosphorus1

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Abstract
Bean (Phaseolus vulgaris L.) lines were screened for efficiency of P utilization in nutrient culture at 2 mg P per plant (seed P + added P). The P in the nutrient cultures was removed rapidly and nearly all the P stored in cotyledons was exported before abscission. From 54 lines screened, 6 were selected to represent extremes in response to P stress and were classified as efficient, moderately inefficient, and inefficient based on dry weight production and P efficiency ratio (PER) defined as the mg dry weight yield per mg of P in the tissue. PER values for top dry weight production at 2 mg of P varied from 380 to 671 mg. In some lines, growth increased as solution P increased to relatively high levels; in other lines there was no growth response. Under P stress, net photosynthesis per unit of P was higher in an efficient than in an inefficient line. Thus, 1 factor in P efficiency was concluded to be associated with photosynthetic metabolism. Inheritance of P efficiency based on top dry weight varied among different matings. Reciprocal hybrids indicated little or no maternal inheritance of efficiency.

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