Abstract
Summary The effects of brassinosteroid, of twelve related sterols and of three sterols on maize root growth and on H+ secretion were investigated. A number of steroids stimulated root segment elongation and H+ secretion as brassinosteroid does. Defined structural requirements were found for the effect on growth; on the contrary, all the steroids tested, among which stigmasterol, cholesterol and ergosterol, were active on H+ secretion. Cholesterol stimulated K+ uptake and dark CO2 fixation, two processes generally associated with the activity of the H+ pump.
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