INHERITANCE OF ALUMINUM TOLERANCE IN WHEAT

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Abstract
Al tolerant and Al sensitive wheat (Triticum aestivum L. em Thell) cultivars representing different parental backgrounds were used to study the inheritance of response to Al. F1, F2, F3 and backcross generations from crosses of 4 soft red winter wheat cultivars were grown in nutrient solutions containing 8 ppm Al. There apparently were no genetic differences between the 2 sensitive parents (''Redcoat'' and ''Arthur'') for Al response. The 2 tolerant parents (''Seneca'' and ''Thorne'') also exhibited no apparent genetic differences for Al response but were decidedly superior to the sensitive parents in the presence of Al. F1, F2 and backcross data from sensitive/tolerant crosses indicated that sensitivity was conditioned by a single recessive gene. Selection for Al sensitive plants in the F2 was effective, based upon their F3 family means. Selection for intermediate or tolerant plants was less effective, indicating that the inheritance was more complex than a single gene. Leaf length and roots per plant were inferior to root length as measures of Al tolerance. These nutrient culture results were consistent with the occurrence of sensitive and intermediate lines and the absence of highly tolerant lines from breeding populations selected on limed soils.