The significance of the magnesium to manganese ratio in plant tissues for growth and alleviation of manganese toxicity in tomato (Lycopersicon esculentum) and wheat (Triticum aestivum) plants - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 1990

The significance of the magnesium to manganese ratio in plant tissues for growth and alleviation of manganese toxicity in tomato (Lycopersicon esculentum) and wheat (Triticum aestivum) plants

Résumé

Results are reported for tomato (Lycopersicon esculentum L. var. Ailsa craig) and wheat (Triticum aestivum L. cv. Mara) which demonstrate that increasing concentrations of Mg in the plant raises plant tolerance to M n toxicity. Water culture experiments with tomato show that under conditions of high M n supply (200 µM, Mn), not only does increasing Mg application (0.75 mM to 15 mM) depress Mn uptake, but the higher Mg concentrations in the shoot counteract the onset of Mn toxicity when the concentrations of Mn in the shoot are also high. The ratio of Mg:Mn in the tissues is a better indicator of the appearance of toxicity symptoms than Mn concentration alone. Toxicity symptoms were observed when the Mg:Mn ratio in the shoot tissue was from 1.13 to a value between 3.53 and 6.54. The corresponding Mg:Mn ratio in the older leaves was from 0.82 to between 2.27 and 3.51. For wheat grown in soil, analyses of leaves revealed that growth could be expressed by the following relationship: Y = A + B exp(−kX), where Y = growth, X = Mg:Mn ratio, A, B and k = constants. Growth was significantly reduced when the Mg:Mn ratio fell below 20:1. From a measurement of this ratio it is therefore possible to predict the appearance of Mn toxicity and its influence on growth.
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Dates et versions

hal-04514610 , version 1 (21-03-2024)

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Jacques Le Bot, M. Goss, M. Carvalho, M. van Beusichem, E. Kirkby. The significance of the magnesium to manganese ratio in plant tissues for growth and alleviation of manganese toxicity in tomato (Lycopersicon esculentum) and wheat (Triticum aestivum) plants. Plant Nutrition — Physiology and Applications, Springer Netherlands; Springer Netherlands, pp.223-228, 1990, ⟨10.1007/978-94-009-0585-6_38⟩. ⟨hal-04514610⟩
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