The influence of aluminium availability on phosphate uptake in Phaseolus vulgaris L. and Phaseolus lunatus L. |
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| Authors: | Tanja Mimmo Marco Sciortino Massimiliano Ghizzi Giorgio Gianquinto Carlo E Gessa |
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| Institution: | 1. University of Eastern Finland, Department of Environmental Science, P.O. Box 1627, FIN-70211 Kuopio, Finland;2. Botanic Institute of São Paulo, Department of Ecology, P.O Box 3005, 01061-970 São Paulo, Brazil;1. Department of Applied Bioscience, College of Life and Environmental Science, Konkuk University, Seoul 143-701, Republic of Korea;2. Korea Forest Research Institute, 57 Hoegiro, Dongdaemun-gu, Seoul 130-712, Republic of Korea;3. Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Republic of Korea;4. National Institute of Crop Science, Rural Development Administration, Suwon 441-857, Republic of Korea;1. Department of Plant Physiology, Maria Curie-Sk?odowska University, Akademicka 19, 20-033 Lublin, Poland;2. Department of Cell Biology, Maria Curie-Sk?odowska University, Akademicka 19, 20-033 Lublin, Poland;1. Dipartimento di Biologia Applicata, Università degli Studi di Perugia, 06121 Perugia, Italy;2. Dipartimento di Scienze e Tecnologie per l’Agricoltura, le Foreste, la Natura e l’Energia, Università degli Studi della Tuscia, 01100 Viterbo, Italy |
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| Abstract: | Aluminium toxicity is one of the major limiting factors of crop productivity on acid soils. High levels of available aluminium in soil may induce phosphorus deficiency in plants. This study investigates the influence of Aluminium (Al) on the phosphate (Pi) uptake of two Phaseolus species, Phaseolus vulgaris L. var. Red Kidney and Phaseolus lunatus L. The two bean species were treated first with solutions of Al at different concentrations (0, 25, 50 and 100 μM, pH 4.50) and second with solutions of Pi (150 μM) at pH 4.50. The higher the Al concentration the higher the Al concentration sorbed but P. vulgaris L var. Red Kidney adsorbed significantly more Al than P. lunatus L. Both species released organic acids: P. vulgaris L var. Red Kidney released fumaric acid and P. lunatus L. fumaric and oxalic acids which could have hindered further Al uptake.The two bean species showed a sigmoid Pi uptake trend but with two different mechanisms. P. vulgaris L var. Red Kidney showed a starting point of 3 h whereas P. lunatus L. adsorbed Pi immediately within the first minutes. In addition, P. vulgaris L var. Red Kidney presented significantly higher Pi uptake (higher uptake rate ‘k’ and higher maximum adsorption ‘a’ of the kinetic uptake model). The Al treatments did not significantly influence Pi uptake. Results suggest that P. lunatus L. might adopt an external Al detoxification mechanism by the release of oxalic acid. P. vulgaris L var. Red Kidney on the other hand seemed to adopt an internal detoxification mechanism even if the Al sorbed is poorly translocated into the shoots. More detailed studies will be necessary to better define Al tolerance and/or resistance of Phaseolus spp. |
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