Abstract
Kiwifruit (Actinidia deliciosd) vines suffer iron chlorosis when growing in a calcareous soil and symptoms occur despite the presence of medium-to-high concentrations of leaf iron, suggesting the presence of a mechanism that immobilize Fe in plant tissues. In the present study we found a negative correlation between the leaf pH and the chlorophyll concentration in leaves of kiwi vines showing different degrees of chlorosis in calcareous soil and then investigated the effects of acid sprays on chlorotic leaves of kiwi grown in a markedly calcareous soil. The following solutions were sprayed three times at five- and six-day intervals on separate shoots of the same plant (three plants in total): citric acid (2000 mg L-1 and 6000 mg L-1 ), sulphuric acid (38 mg L-1 ), Fe-DTPA ( 130 mg L-1) and deionized water (control). At the end of the trial (19 days from the beginning of treatment application), Fe-chelate caused the most intensive regreening, followed by citric acid (both rates); sulphuric acid caused only a slight increase of leaf chlorophyll as compared to control. The pH of leaves treated with citric but not with sulphuric acid decreased by about 0.2 units as compared to control. Iron-chelate resulted in the greatest increase of both active (extracted by ferrozine) and total iron. The leaves treated with citric acid at both rates also increased their active iron content by about 50% as compared to control leaves. These findings support that high leaf apoplastic pH of plants in calcareous soil is somehow responsible for Fe immobilization and its physiological deficiency.
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© 1995 Springer Science+Business Media Dordrecht
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Tagliavini, M., Scudellari, D., Marangoni, B., Toselli, M. (1995). Acid-spray regreening of kiwifruit leaves affected by lime-induced iron chlorosis. In: AbadÃa, 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_27
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DOI: https://doi.org/10.1007/978-94-011-0503-3_27
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