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Articles

Zinc, Iron, and Chlorophyll Metabolism in Zinc-toxic Corn ¹

^a Department of Biology, Franklin and Marshall College, Lancaster, Pennsylvania 17604

Zinc toxicity and Zn-Fe interactions were studied in corn (Zea mays L. var. Barbecue hybrid) grown in hydroponic culture. High Zn greatly reduced the root and shoot fresh weights; increasing Fe largely, but not completely, restored normal growth. Correlation analyses of root and leaf Zn and Fe contents suggested that Zn may interfere with the translocation of Fe; however, Zn toxicity was not associated with a diminished leaf Fe content. Fe did appear to retard both the absorption and the translocation of Zn. The chlorosis of Zn-toxic plants is not attributable to diminshed total leaf Fe; however, this chlorosis is relieved by increasing nutrient Fe. Zn and Fe probably do interact at some site.

³ To whom correspondence should be addressed.

⁴ Present address: School of Medicine, Duke University, Durham, N.C. 27706.

¹ Supported in part by National Science Foundation Student Originated Studies Grant GY-11460 and by the Committee on Grants, Franklin and Marshall College.