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Phosphorus nutrition alleviates manganese toxicity in Lolium perenne and Trifolium repens
Authors:Analí Rosas  Zed Rengel  Alejandra Ribera  María de La Luz Mora
Institution:1. Departamento de Suelos y Recursos Naturales, Facultad de Agronomía, Universidad de Concepción, P.O. Box 537, Chillán, Chile;2. Soil Science and Plant Nutrition, School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia;3. Center of Plant‐Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, P.O. Box 54‐D, Temuco, Chile
Abstract:Phosphorus (P) nutrition has been suggested to play a role in the alleviation of manganese (Mn) toxicity in some higher plant species. However, there are few reports on the role of P in regulating Mn accumulation by forage species. We studied the effect of P nutrition on Mn toxicity in Lolium perenne L. and Trifolium repens L. An increase in Mn concentration in root and shoot tissues was associated with an increase in both P supply and P tissue concentrations. Nevertheless, in both forage species, especially white clover, plant‐growth inhibition caused by Mn excess was decreased with increasing P additions. Moreover, the carboxylate exudation that had increased in response to high Mn was gradually reduced by increasing P supply. We suggest that P supply may have a beneficial effect in reducing the severity of Mn toxicity in forage species.
Keywords:metal toxicity  white clover  perennial ryegrass  metal avoidance  organic acids
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