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Efficient and Inefficient Use of Phosphorus by Sorghum¹

ABSTRACT

Twelve (Sorghum bicolor L. Moench) genotypes were grown on acid-Bladen soil (pH 4.3, P stressed or Al toxic), on limed-Bladen soil (pH 5.2, Cu stressed), and on alkaline Quinlan soil (pH 7.5, Fe stressed) to determine the effect of P efficiency on use of these clements by the plants. Under P-stress or Al-toxicity conditions, the most P-efficient sorghum genotypes absorbed more 32P than the most P-inefficient lines and grew normally, while the P-inefficient plants developed P-deficiency symptoms. Under Fe-stress conditions, the most P-efficient genotypes developed Fe chlorosis, while the most P-inefficient plants remained green. Under Cu-stress conditions, one of six genotypes developed severe Cu-deficiency symptoms, characterized by the accumulation of higher P in the lower leaves, and by lower Fe and Ca in upper leaves of Cu-stressed plants as compared with Cu-sufficient plants. Thus, P efficiency in plants may be an asset when P availability limits growth, but it may be a liability when these same plants are subjected to Fe or Cu stress.

¹ Contribution of U.S.D.A., ARS, Northeast Region, Beltsville, MD and North Central Region, Univ. of Nebraska, Lincoln, NE as Paper no. 5211, J. Ser., Nebr. Agric. Exp. Stn.

² Research Soil Scientist, USDA-ARS, Plant Stress Laboratory, Beltsville, MD 20705; Research Chemist, USDA-ARS, Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583; and Research Technician, USDA-ARS, Plant Stress Laboratory, Beltsville, MD 20705; respectively.

Received for publication November 1, 1976. Accepted for publication February 28, 1977.