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Abstract
Sorghum [Sorghum bicolor (L.) Moench. cv GP‐10] root tips (1‐cm) were exposed to potassium (K+) (1 mM), ruthenium red (RR) (0.1 mM), erythrosine B (EB) (1 μM), and combinations of K+ + RR or K+ + EB to measure calcium (45Ca2+) absorption in 1‐hr. K+ (1 mM) decreased 45Ca2+ absorption by 30%. RR (0.1 mM) decreased 45Ca2+ accumulation by 65%. EB (1 uM) induced a 35% decreased 45Ca2+ absorption. Addition of K+ (1 mM) reversed the influence of RR and EB on 45Ca2+ uptake.