Far-red Light Alters Primocane Morphology of Red Raspberry

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  • 1 Department of Plant Agriculture, University of Guelph, P.O.Box 587, 1283 Blueline Road, Simcoe, Ontario, Canada N3Y 4N5
  • 2 University of Guelph, Department of Plant Agriculture, Vineland Station, Ontario, Canada L0R 2E0

The objectives of the study were to determine whether raspberries responded to decreased red to far-red ratio and whether it was more effective at the beginning or end of the dark period. Increased proportions of far-red light increased the internode length when at the beginning of the dark period on the three raspberry cultivars `Lauren',`Reveille', and `Titan'. Cultivars varied in that internode length also increased in ambient daylength compared to short days in `Lauren' and `Reveille', but not in `Titan'. They also responded differently to photoperiod: `Titan' and `Lauren' grew under short days, whereas `Reveille' ceased growth.

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