Photoperiod - Open Access .click

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1985
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 ...
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Phytochrome and photoperiodic induction

Physiologia Plantarum, 1991
The photoreceptor phytochrome has been extensively characterized at the chromophore, protein and gene level. It consists of a family of red/far‐red reversible molecules and the genes for three members have been sequenced. Phytochromes are chromoproteins, which probably exist as dimers in vivo. Photoperiodism in higher plants involves the interaction of
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Vernalization and Photoperiodism