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Different concentrations of aluminium (10-150 μM) inhibited the accumulation of Ca, Mg, Fe and PO4 in rice and chickpea seedlings grown in solution culture. In rice and chickpea, the intensity of inhibition of the accumulation of Ca, Mg, Fe and PO4 enhanced with the increase in Al concentrations from 10 to 150 μM. On the contrary, application of aluminium caused a dramatic few fold increase in accumulation of Al in different parts of rice and chickpea seedlings. Introduction A large amount of aluminium (Al) is incorporated into aluminosilicate soil minerals, and very small quantities appear in the soluble form, capable of influencing biological systems (May and Nordstrom 1991). Acid soil having pH below 5.0 increases the solubility of Al, which in subsoil is particularly harmful for plants (Lidon and Barreiro 2002). Nutritional imbalances induced by Al exposure were reported for several plant species (Silva 2012). Concentration of calcium drastically reduced in presence of aluminium in spinach (Karimaei and Poozesh 2016) and cacao (Ribeiro et al. 2013). Aluminium decreased Mg content in the leaves and roots of physic nut (Steiner et al. 2012) and the foliage and root of silver birch (Bojarczuk et al. 2006). Toxic Al concentration decreased significantly the concentrations of Fe in sorghum (Clark et al. 1981) and in maize (Lidon et al. 1999). Al caused a decrease in Mg and Fe content in the root but an increase in those ions in the stem of Pinus massoniana was found (Zhang et al. 2014). Exposure of Al increased Al concentration in leaves of buckwheat (Ma et al. 1998). Concentration of Al was high in the root and generally low in the tops of honeylocust and loblolly pine seedling (Wagatsuma et al. 1987). Phosphate (PO4) uptake was first inhibited and then increased in corn root following aluminium treatment (Facanha and Okorokova-Facanha 2002). Aluminium ions blocked P uptake in soybean plants (Zheng 2010). Materials and Methods Rice (Oryza sativa var. BRRI Dhan-53), the main cereal grain of the family Poaceae and chickpea (Cicer arietinum var. Bari chhola-7), the third most important pulse of the family Fabaceae; were used as experimental plant materials. Seeds of rice were collected from Bangladesh Rice Research Institute (BRRI) and that of chickpea were obtained from Bangladesh Agricultural Research Institute (BARI), respectively. The seeds were surface sterilized according to Samad and Karmoker (2013). The sterilized seeds were spread over a cotton gauge placed in a lid having holes (1 cm in diameter) and the lid with seeds was placed on a beaker containing 500 ml of distilled water. The beakers were covered by black plastic sheet to avoid the exposure of light to the roots. *Author for correspondence: .

Effects of aluminium stress on the accumulation of cations and anions in rice and chickpea seedlings grown in solution culture