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Effect of fertilization on exudation dehydrogenase activity iron reducing populations and iron ion formation in the rhizosphere of rice oryza sativa in relation to iron toxicity



Effect of fertilization on exudation dehydrogenase activity iron reducing populations and iron ion formation in the rhizosphere of rice oryza sativa in relation to iron toxicity



Plant & Soil 79(3): 305-316



To explain the mechanism of Fe toxicity, greenhouse and growth chamber (14CO2 atmosphere) experiments were carried out. In pot experiments (with a typical Fe-toxic soil and a fertile clay) the effect of N, P, K and Ca + Mg fertilization (alone or in combination) on dehydrogenase activity, Fe2+ formation and the populations of Fe-reducing bacteria in the rhizosphere of rice 'IR22' and 'IR42' were studied. Fe uptake by the plants was measured at regular intervals. Dehydrogenase activity, the number of N2-fixing Fe-reducing bacteria, and the formation and uptake of Fe2+ decreased with increased supply of K, Ca and Mg. This effect was clearer with 'IR22' (susceptible to Fe toxicity) than with 'IR42' (relatively tolerant). Increased exudation and Fe uptake by 'IR36' at low nutrient and high Fe supply were recorded in a growth chamber experiment. Nutritional conditions, exudation rate (a measure of metabolic root leakage), the Fe-reducing activity of the rhizosphere, and Fe2+ uptake by wetland rice apparently are clearly related. Fe toxicity is considered a physiological disorder caused by multiple nutritional soil stress rather than by a low pH and high Fe supply per se.

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Accession: 005239058

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