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Factors Associated with Differential Response of Two Oat Cultivars to Zinc and Copper Stress¹

Oat (Avena byzantina C. Koch) cultivars ‘TAM 0-312’ (Fe-inefficient and Ca-efficient) and ‘Coker 227’ (Feefficient) were subjected to Zn and Cu stresses to determine consequent effects on Fe and Ca nutrition in the two cultivars. To induce Zn and Cn stress, the plants were grown in low-Zn Taunton and Shano soils, and in low-Cu limed Bladen soil. Under zinc stress, Coker 227 used Fe more efficiently than TAM 0-312. TAM 0-312 tops contained 3600 µg/g (dry wt) more Ca than comparable Coker 227 tops and this higher Ca seemed to enhance both Fe- and Zn-deficiency symptoms in TAM 0-312. Top leaves of Cu-stressed TAM 0-312 contained 4300 µg/g (dry wt) more P than comparable Coker 227 leaves. This Cu-deficiency stress induced accumulation of phosphate seemed to inactivate Ca in TAM 0-312, causing ‘withertip’ to develop. Coker 227 did not develop ‘withertip’ symptoms. Ca-efficiency did not alleviate Cu-inefficiency in TAM 0-312.

Key Words: Ca-efficient • Fe-efficient • Ca-inefficient • Fe-inefficient • Cu-deficiency symptoms • Fe chlorosis • Zn deficiency symptoms • Ca-phosphate • Avena byzantina

² Research soil scientist, USDA-SEA-FR, Plant Stress Laboratory, Beltsville, MD 20705 and associate professor, Dep. of Soil and Crop Sciences, Texas A & M Univ., College Station, TX 77843.

Received for publication February 23, 1978.