Copper Toxicity in Phaseolus vulgaris L. as Influenced by Iron Nutrition. II. Elemental and Electron Microprobe Analyses1,2
Open Access
- 1 January 1973
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 98 (1) , 31-34
- https://doi.org/10.21273/jashs.98.1.31
Abstract
In plants grown without Fe or with Fe tartrate, 0.50 ppm Cu reduced Fe concn only in the roots. When FeEDTA was used, Fe concn were higher in the roots at 0.04 and 0.50 ppm Cu than other treatments. Concentrations of Cu in the roots increased with the increase in Cu in the nutrient solution; in the shoots there was little difference. With FeEDTA, the Cu concn in the roots and shoots at both levels of Cu was considerably less than with Fe tartrate or without Fe. Microprobe analysis showed accumulations of Fe in wall areas of some xylem elements in the midrib of leaves of plants grown with Fe tartrate-0.50 ppm Cu only. Iron did not accumulate in comparable tissues with Fe tartrate-0.04 ppm Cu and with FeEDTA-0.04 and 0.50 ppm Cu. Copper was distributed uniformly throughout the tissues but P accumulated only in wall areas of the cells. The localization of Fe and P in the same cell suggested that high Cu induced chlorosis by precipitation of Fe as Fe phosphate.Keywords
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