Aluminum Tolerance of Soybean Cultivars Based on Root Elongation in Solution Culture Compared with Growth in Acid Soil1
- J. B. Sartain and
- E. J. Kamprath2
Growth of soybean [Glycine max (L.) Merr.] roots into acid subsoils and utilization of subsoil moisture is limited in many soils of the southeastern U. S. because of Al toxicity. Laboratory and greenhouse experiments were conducted to obtain information on tolerance of soybean cultivars which would be helpful in selection of cultivars best adapted to acid subsoils. Root elongation measurements were made of 18 cultivars exposed for 48 hours to solutions containing 0, 0.25, 0.50, and 1.0 ppm Al and 10 ppm Ca. Eleven of the cultivars were selected for a greenhouse experiment in which plants were grown in a Lynchburg soil (Aerie Paleaquult) at 81 and 4% Al saturation. Measurements were made of top growth, root length, and the Ca, P, and Al concentrations of the plant tissue. Of the 11 cultivars used, ‘Lee’, ‘Lee 68’, ‘York’, ‘Ogden’, and ‘Dare’ were judged to be relatively Al tolerant according to the short term root elongation studies. Based on absolute top growth in the 81% Al saturated soi1 or relative top growth in the 81% Al saturated soil as compared with the 4% Al saturated soil the cultivars Lee, ‘Bragg’, ‘Pickett 71’, and York were more tolerant of Al than the other cultivars.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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