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Abstract
Seminal root‐tips (1‐cm) of Paspalum vaginatum Swartz cv Sea Island I were evaluated for the influence of PCMBS (0, 0.01, 0.1, or 1 mM), nifedipine (0, 0.01, 0.1, or 1 μM), verapamil (0, 0.01, 0.1, or 1 mM), diltiazem (0, 0.01, 0.1, or 1 mM) orthovanadate (0, 0.01, 0.1, or 1 mM), nitrate (NO3‐) (0, 0.01, 0.1, or 1 mM), and ammonium, (NH4+) (0, 0.01, 0.1, or 1 mM) on calcium (45Ca2+) absorption. Calcium absorption was inhibited by the Ca2+‐channel blockers (i.e., nifedipine, verapamil, and diltiazem) and the H+‐ATPase or Ca2+‐ATPase inactivator, PCMBS. Sea Island I seminal root‐tips were vanadate‐insensitive and NO3‐sensitive, indicating the presence of tonoplast‐type ATPases and very little (or none) activity of PM‐type ATPases on the PM. Ammonium did not influence 45Ca2+ absorption by Sea Island I seminal root‐tips.