Abstract
Auxin induced the formation of tracheary elements in bean seedlings when applied for 24 h to a point source in the hypocotyl. Differentiated tracheary elements appeared basipetally to the application point. Verapamil, a Ca2+ channel blocker, and LiCl, a reported inhibitor of Ca2+ release from intracellular stores, both inhibited tracheary element differentiation when applied after auxin. However La3+, an inhibitor of Ca2+ uptake, was without effect on auxin-induced tracheary element differentiation. The results are discussed in relation to xylogenesis in tissue culture, which requires Ca2+, and vascular strand formation in whole plants, which requires polar auxin transport. It is concluded that Ca2+ is necessary for auxin-induced vascular strand differentiation in the intact plant.
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