Science

Plant Responses to Light

TotalGrow Science - Straight from the Scientists

Custom-tailored TotalGrow spectra are based on extensive study of the effects of specific wavelengths on plants.

Click on the color regions below to explore the science behind the TotalGrow™ spectrum.

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About the Blue Light Region

Blue light (400-499nm) efficiently stimulates chlorophyll, but more importantly it is the main activator of several critical accessory photoreceptors like cryptochromes and phototropins that positively affect many physical traits of plants.

  • Cryptochromes “control plant morphology, gene expression, and the transition to flowering,” and “strongly inhibit stem elongation.”1
  • “Phototropins… regulate a suite of plant processes, ranging from gross morphological changes like leaf expansion,2 phototropism,3 and early stem elongation,4 to cellular processes such as chloroplast position5 and stomatal opening,6 to regulation of mRNA stability…7 These studies indicate that blue light provides important environmental information and that adjustment of the blue component of lighting in an artificial environment, even in a minor amount, may be a potent influence in manipulating physiology and production.”8

Independent Third Party Research Study References
  • 1Folta, Kevin M., and Kayla Shea Childers. "Light as a growth regulator: controlling plant biology with narrow-bandwidth solid-state lighting systems."HortScience 43.7 (2008): 1957-1964. http://hortsci.ashspublications.org/content/43/7/1957.full
  • 2Sakamoto, Koji, and Winslow R. Briggs. "Cellular and subcellular localization of phototropin 1." The Plant Cell Online 14.8 (2002): 1723-1735.
  • 3Christie, John M., et al. "Arabidopsis NPH1: a flavoprotein with the properties of a photoreceptor for phototropism." Science 282.5394 (1998): 1698-1701.
  • 4Folta, Kevin M., and Edgar P. Spalding. "Unexpected roles for cryptochrome 2 and phototropin revealed by highresolution analysis of blue light-mediated hypocotyl growth inhibition." The Plant Journal 26.5 (2001): 471-478.
  • 5Kagawa, Takatoshi, et al. "Arabidopsis NPL1: a phototropin homolog controlling the chloroplast high-light avoidance response."Science 291.5511(2001): 2138-2141.
  • 6Kinoshita, Toshinori, et al. "Phot1 and phot2 mediate blue light regulation of stomatal opening." Nature 414.6864 (2001): 656-660.
  • 7Folta, Kevin M., and Lon S. Kaufman. "Phototropin 1 is required for high-fluence blue-light-mediated mRNA destabilization." Plant molecular biology 51.4 (2003): 609-618.
  • 8Folta, Kevin M., and Kayla Shea Childers. "Light as a growth regulator: controlling plant biology with narrow-bandwidth solid-state lighting systems."HortScience 43.7 (2008): 1957-1964. http://hortsci.ashspublications.org/content/43/7/1957.full

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