Abstract
Abstract Both Zn and Fe stresses (deficiencies) enhance the uptake of Fe in some plant cultivars but not in others. Release of H+ from roots and reduction of Fe3+ to Fe2+ by roots are two factors enhanced by Fe stress. The objective of this study was to determine if these factors are enhanced more in Zn‐inefficient than Zn‐efficient cultivars. Zn‐inefficient Sanilac and Zn‐efficient Saginaw navy beans (Phaseolus vulgaris L.) were used as test plants. Zinc‐deficiency stress enhanced the Fe‐stress‐response mechanism in both cultivars but more Fe was taken up by Sanilac than by Saginaw. Sanilac developed Zn‐deficiency symptoms, but Saginaw did not. In contrast, Zn toxicity caused Sanilac to develop Fe chlorosis, but Saginaw did not. Zinc toxicity induced Fe‐deficiency‐stress‐response in Saginaw but not in Sanilac. The additional Fe available to Saginaw counteracted some of the toxic effects of Zn. Severity and nature of stress symptoms induced by Zn deficiency or Zn toxicity depend on the plant cultivar.
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