Abstract
Kleinia articulata subjected to different photoperiods becomes dormant in long days (continuous light) and grows uninterruptedly in short days (8 h). Dormancy results from the rapid cessation of leaf differentiation and expansion. By contrast stem growth is faster in long days and continues until all leaves have died. In long days growth is not halted permanently but flushes of leaf production and stem elongation occur. Resumption of growth is stimulated rapidly by total darkness or short-day treatment of the extreme stem tips for some days. This species is a strict short-day plant in its flowering behaviour, depending on this daylength for normal inflorescence development also.
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