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SUN‐TRACKING AND RELATED LEAF MOVEMENTS IN A DESERT LUPINE (LUPINUS ARIZONICUS)

A B S T R A C T Both diaheliotropic (sun-tracking) and paraheliotropic (cupping) leaf movements are described for the Arizona Lupine [Lupinus arizonicus (Wats.) Wats.]. The leaf movements are shown to be non-circadian in nature. Evidence is presented that an active K+ ion transport mechanism is involved in these turgor-related leaf movements. Increasing concentrations of lanthanum, a known ion transport inhibitor, showed increasing inhibition of both leaf movements. Increasing concentrations of other salts did not inhibit either leaf movements, instead there was an increase in the cupping leaf movement (elevation of the leaflets) which is shown to be a water stress response.