Separation of Degrees of Aluminum Tolerance in Wheat1

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Abstract
A rapid, simple nutrient solution technique was developed for evaluating Al tolerance of wheat selections (Triticum aestivum Vill., Host). The effective Al concentrations in the screening solutions were maintained within narrow limits by controlling the phosphorus concentration and the pH. Differences in tolerance, notably for root elongation, were evident shortly after germination and were of the same relative order as when plants were grown in acid soils of varying exchangeable Al levels. Approximately 50 varieties were screened for their tolerance to Al, and they fell into three groups: (1) tolerant at 6.4 ppm, (2) tolerant at 2.4 ppm but sensitive at 6.4 ppm, and (3) sensitive at 2.4 ppm. The advantages of the nutrient solution method over the soil method for screening for Al tolerance are discussed. A biological rest was proposed for assessing Al in soils based on the differential response of lines of widely varying tolerance.

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