Abstract
White lupine is a calcifuge plant that is susceptible to iron chlorosis. To gain insight into the iron stress mechanisms involved in calcareous soils, the effects of calcium and bicarbonate concentrations and pH were investigated separately on hydroponically grown lupines. Iron was supplied as Fe-EDDHA.
The maintenance of the nutrient solution pH at a very slighty alkaline value (7.5) induced, in spite of the presence of Fe-EDDHA, visual symptoms that were similar to those observed when Fe was omitted. Disturbances in younger leaf iron nutrition were also observed. A calcium ion overload of 7.5 mit M (in addition to the 2.5 mM already present in the standard nutrient solution) did not result in any symptoms of iron chlorosis on the younger leaves but affected the plant growth and mineral nutrition. However, a 3 mM bicarbonate concentration rapidly induced chlorosis in the younger leaves and disturbed iron nutrition.
The decisive effect of the bicarbonate concentration and the pH on the appearance of chlorosis symptoms was related to a decrease in total and ferrous iron in the younger leaves. The iron deficiency would be accounted for in terms of decreased total iron supply to the younger leaves as well as iron inactivation. Another major effect of bicarbonate was increased calcium concentrations in the roots, most likely in the form of calcium containing precipitates. In calcareous soils, the bicarbonate concentration is thus likely to enhance the adverse effect of calcium on lupine growth.
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Pissaloux, A., Morard, P., Bertoni, G. (1995). Alkalinity-bicarbonate-calcium effects on iron chlorosis in white lupine in soilless culture. In: Abadía, J. (eds) Iron Nutrition in Soils and Plants. Developments in Plant and Soil Sciences, vol 59. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0503-3_18
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DOI: https://doi.org/10.1007/978-94-011-0503-3_18
Publisher Name: Springer, Dordrecht
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