Abstract
Experiments designed to study the effect of light quality and quantity and their possible interaction with benzyladenine (BA) in the control of in vitro proliferation of Prunus insititia Schneider GF 655–2 microcuttings are reported. The action of BA as a promoting factor of shoot formation was expressed only in the presence of light. The concentration response curves for BA‐induced proliferation were very similar under the different light sources, irrespective of proliferation rate values.Shoot formation under blue, far‐red and white light was enhanced by the highest photon fluence rates, while the efficiency of red seemed to be independent of this factor. The results suggest the action of a low‐energy response in the red waveband and under the low photon fluence rates of blue and white. The inhibition of shoot elongation induced by BA in the dark as well as under all light treatments indicates that, while the BA‐induced release from the apical dominance is light dependent. BA inhibition of shoot elongation is entirely light independent.
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