A growth-chamber experiment was conducted in nutrient solution containing 0 or 8 ppm of aluminum as Al2K(S04)3 to study differential Al tolerance of soybean germplasm representing Maturity Groups V, VI and VII, supplied by Dr. E. E. Hartwig. Two soybean cultivars, one sensitive ('Chief') and the other tolerant ('Perry'), were included as standard checks (Fig. 1). Soybean roots were affected by the presence of Al and showed discoloration, stunted and blackish root tips .
Sapra, Val T.; Mebrahtu, Taddesse; and Mugwira, Luke M.
"Research Notes : Evaluation of soybean germplasm for aluminum tolerance,"
Soybean Genetics Newsletter: Vol. 7
, Article 9.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol7/iss1/9