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Interactions of Lead and Cadmium on Metal Uptake and Growth of Corn Plants¹

ABSTRACT

Short term plant accumulation and growth effects of Pb and Cd added to soil separately and in combination were investigated with corn (Zea mays L., Wf9 x M14) grown in a loamy sand under greenhouse conditions. A tendency for soil Pb to increase both the plant Cd concentration and the total Cd uptake of the corn shoots was observed. Conversely, soil Cd reduced the total Pb uptake and in some cases the Pb concentration in the corn shoots. Both Pb (125 and 250 µg/g soil) and Cd (2.5 and 5 µg/g soil) reduced the vegetative growth of the corn shoots, and a positive interaction of the two metals on growth was noted.

Key Words: ion uptake • plant toxicity

¹ Contribution from Dep. of Agron. and Inst. for Environ. Stud., Univ. of Illinois, Urbana, IL 61801. Research support from NSF-RANN GI-31605 and the Ill. Agric. Exp. Stn. is gratefully acknowledged.

² Former Post-doctoral Associate, Univ. of Illinois, now Assistant Ecologist, Argonne Nat. Lab., Argonne, Ill.; Associate Professors, Agron. Dep., Univ. of Illinois, respectively.

Received for publication March 3, 1976.