Abstract
Photoperiod has been shown to affect the tissue levels of hormones in all of the major categories. More difficult to assess is the precise role of these variations in controlling the many responses of plants to daylength. The great range of photoperiodic behavior (see Vince-Prue 1975) precludes discussion of the hormonal regulation of all daylength-controlled phenomena and this review, there-fore, concentrates on selected responses in three major areas: a) vegetative growth (stem elongation), b) dormancy phenomena (the formation of storage organs and resting buds), c) reproductive behavior (the formation of floral primordia).
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