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Phytochrome Switching Short Day Plants

Research and Other Documents Relevant to Grow Lighting and Horticulture.plant-lighting
To better understand the needs of plants, it is helpful to visit scientific research documents, and other useful bits of knowledge.

Pursuit of knowledge can lead to new techniques and products.

Products properly informed by Scientific principals will display superior performance.

Techniques can be employed to improve horticultural productivity, improve the smell, taste and color of foods and ornamental crops , increased yields and the overall health and quality. Implementation can be useful in the Greenhouse, Outdoors and in the Greenhouse.

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Phytochrome, Short Day Plant Relevant: The Flower Initiator can be used rather than curtains.
  • Plant Science:  More than thirty Power Point Presentations relevant to horticulture.
  • Effect of Far-red Light and Its Interaction with Red Light in the Photoperiodic Response of Pharbitis nil'. Atsushi Takimoto3 and Karl C. Hamner Department of Botany and Plant Biochemistry, University of California, Los Angeles. ...Xanthiulm far-red light given at the beginning of the dark period promotes flowering and shortens the critical dark period by some 2 hours.
  • Newly Discovered Chlorophyll Catches Infrared LightBY RACHEL EHRENBERG, SCIENCE NEWS08.20.102:09 PM. A new kind of chlorophyll that catches sunlight from just beyond the red end of the visible light spectrum has been discovered. The new pigment extends the known range of light that is usable by most photosynthetic organisms. Harnessing this pigment’s power could lead to biofuel-generating algae that are super-efficient, using a greater spread of sunlight than thought possible.
  • Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals. Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of the light and dark periods. Here it should be emphasized that photoperiodic effects relate directly to the timing of both the light and dark periods.

  • Photoperiod (Day Length) A Plants Internal Clock is regulated largely by Phytochrome.
  • 39.1: Photoperiodism: Far-red Light Cancels the Effect of Red Light Shortening of night length by red light (R) can be negated by a flash of far-red light (FR) of 730 nm. When this occurs, the plant perceives no interruption in night length. No matter how many times red light is flashed, as long as it is followed by far-red light the effects of red light are canceled. This works in both short-day and long-day plants. 
  • Laboratory Manual Experiment 11. Growing Plants Indoors Under LightsThe first attempt to use artificial light was probably in 1893 by Liberty Hyde Bailey. This work showed that plants could use electric lights for their growth. The use of artificial lights for plant growth did not receive much attention until around 1920. 
  • Phytochrome: A protein pigment that mediates in photoperiodic responses and certain other photoreactions, e.g. light-stimulated germination and the removal of the symptoms of etiolation. It exists in two interchangeable forms, Pr, which absorbs in the red part of the spectrum (660 nm), and Pfr, which absorbs in the far red (730 nm).
  • Floral Induction and the Effect of Red and Far-red Preillumination on the Light-Stimulated Bioelectric Response of Spinach Leaves. H. Greppina, B. Horwitz, Department of Plant Physiology, University of Geneva, Switzerland. Zeitschrift für Pflanzenphysiologie Volume 75, Issue 3, May 1975.

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