Combined Effects of Mg and Ca Supply on Alleviation of Al Toxicity in Wheat Plants(Plant Nutrition)

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A Bangladeshi wheat (Triticum aestivum) cultivar, Kalyansona, was exposed to 100 μм Al with varying concentrations of Ca (250, 500, 2,500 μм) and Mg (103, 1,029, 4,115 μм) in the nutrient solution for 14 d. Exposure to Al along with low concentrations of both Ca and Mg caused severe damage to the root apex. Under Al-stressed conditions, an increased supply of Mg from 103 to 1,029 μм enhanced the root length by 44, 22, and 3% at 250, 500, and 2,500 μм Ca, respectively. Root growth at 2,500 μм Ca was not affected by additional Mg concentration. Again, an increased supply of Mg from 103 to 4,115 μм enhanced the root length by 56% at 500 μм Ca. Under the Al-stressed conditions, the increase in the root length was correlated with the decrease in the Al content in roots. Our results suggest that Mg alleviates Al toxicity efficiently in the presence of Ca at a low level in the culture solution by decreasing Al accumulation in roots.
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