Influence of cobalt and iron on photosynthesis, chlorophyll, and nutrient content in regreening chlorotic tomatoes and soybeans
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Iron-efficient and-inefficient tomatoes (T3238 FER and T3238 fer, respectively) and soybeans (A7 and T203, respectively) were grown in nutrient solution culture for nine and seven days with four Fe-Co treatments (0, 0; 1, 0; 1, 1.2; and 0, 1.2 mg/liter Fe and Co, respectively). Both Fe-efficient and-inefficient cultivars exhibited Fe-and Co-induced chlorosis, but the efficient FER cultivar was least susceptible to both stresses. Cobalt generally decreased net photosynthesis (Pn), chlorophyll, and foliar iron in either the presence or absence of Fe. After nine and seven days of growth in the above treatments (tomato and soybean, respectively), new solutions were introduced to all of the above treatments, and 1 mg Fe/liter was added to three treatments to study regreening (designated 0, 0+; 0, 1.2+; 1, 1.2+); the original control treatments (0, 0; 1, 0) continued without additional iron. Recovery of Pn and chlorophyll from added Fe was observed in all cultivars for the 0, 0+ treatment, was variable among cultivars for the 1, 1.2+ treatment, and was observed only in FER tomato for the 0, 1.2+ treatment. Any influx of Fe during the regreening phase accumulated primarily in the leaves in the absence of Co (0, 0+) and in the roots in the presence of Co (0, 1.2+ and 1, 1.2+). Iron-stress responses (pH and reductant) were apparent only with 0, 0 treatment for A7 and FER and were eliminated by adding Fe (0, 0+). 1986, Taylor & Francis Group, LLC. All rights reserved.
