(Date) Title: INFLUENCE OF CATIONS ON ALUMINUM TOXICITY IN

Abstract

The toxicity of aluminum (Al) to wheat (Triticum aestivum Host) was studied under controlled conditions using a technique designed to evaluate the recovery of root growth following a rela-tively brief (48 hour) exposure to nutrient solutions containing Al, When wheat seedlings were exposed to a minimum critical concentration of Al, the root primary meristem was irreversibly damaged and did not reinitiate growth when transferred into an Al-free nutrient solution. This method was quite precise and reproducible when temperature, pH, nutrient concentration and Al concentration of the solutions were rigidly controlled. The severity of toxicity was sharply increased by decreasing the con-centrations of nutrients in the Al treatment solutions. Four wheat varieties of widely differing tolerance to Al all behaved similarly in this respect suggesting that tolerance is a relative rather than an absolute varietal characteristic. The critical Al concentrations for four classes of tolerance were determined and the conditions for separating these classes by a rapid, precise, and convenient screening procedure was developed. The inhibition of root growth by Al could be completely over-come in all four varieties by increasing the Ca, Mg, K, or Na concentration in the Al treatment solutions. These findings indicate that the effect of cations on reducing Al toxicity was nonspecific and conclusively showed that Al toxicity was not due to deficiencies of Ca, Mg, K or P as has been extensively suggested in the literature. Influence of Cations on Aluminum Toxicity in Wheat (Triticum aestivum Vill. Host) b

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oai:CiteSeerX.psu:10.1.1.995.9373Last time updated on 11/2/2017

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