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Abstract
Sorghum bicolor (L.) Moench. cv GP‐10, SC283, SC574, and Funk 6522DR seedling root tips (1 cm) absorption of calcium (45Ca2+) in the presence of 0.1 mM ruthenium red (RR) and verapamil (0, 0.01, 0.1, 1.0, or 10 mM) was evaluated at pH 5.5. Verapamil was not inhibitory in Funk G522DR, significantly inhibited 45Ca2+ absorption at 1.0 mM verapamil in GP‐10, SC283, and SC574 by 35, 65, and 55%, respectively. Genetic variation is documented. Additionally, as yet unrecognized physiological parameters seem to induce changes in response by the various cultivars.