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Published in Crop Sci 19:126-128 (1979)
© 1979 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Role of Roots and Shoots of Soybeans in Tolerance to Excess Soil Zinc1

M. C. White, R. L. Chaney and A. M. Decker2

Reciprocal grafts were used to determine the relative importance of the roots and shoots of soybean (Glycine max L.) in tolerance to excess soil Zn. Grafts, in all combinations, were made between ‘Wye’ (Zn-tolerant) and ‘York’ (Zn-intolerant) soybean cultivars. For plants grown at soil pH 6.2 and soil Zn additions of 1.31, 131, and 393 ppm, the results showed that the scion genotype controlled relative Zn tolerance, while the rootstock genotype controlled Zn absorption and translocation. Differences in foliar Zn concentrations were not responsible for differential Zn tolerance of these two soybean cultivars.

Key Words: Reciprocal grafts • Metal tolerance • Metal uptake

1 Contribution No. 5423 Scientific Article A2404 of the Maryland Agric. Exp. Stn., Dep. of Agronomy, Univ. of Maryland, College Park, in cooperation with the Biological Waste Management and Soil Nitrogen Laboratory, AEQI, Beltsville Agric. Research Center, USDA, SEA, Beltsville, Md. Part of a thesis submitted by the senior author in partial fulfillment of M.S. degree requirements.

2 Soil scientist, Maryland Environmental Service, Annapolis; plant physiologist, USDA, SEA, Beltsville, Md.; and professor of agronomy, Univ. of Maryland, College Park, respectively.

Received for publication February 11, 1978.




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Copyright © 1979 by the Crop Science Society of America.