Expts with different colors of light

Jon Monroe monroejd at jmu.edu
Thu Feb 24 15:36:03 EST 2000

mmphillips at stkate.edu wrote:

> I have a number of student groups wanting to do experiments investigating
> the effects of different colors of light on plant growth.   I've not been
> satisfied with what we've used in the past to try to do this -- does anyone
> have suggestions of good sources for colored films/gels/whatever to use to
> filter the light?   Or are there light bulbs out there that could be used?
> I'm not finding stuff in the Carolina catalog, Wards, etc. but may be
> looking in the wrong place.

Sigma sells tinted "phytatrays" (p 2355 of the '00-'01 catalog) that 
are either clear, blue, red or yellow (see the catalog for wavelength 
cutoffs).  At about 4" cubed they would work for small plants and at 
about $1 each they are affordable.  Sigma cites Hangarter et al. 
(1991), Repression of plant tissue culture growth by light is caused 
by photochemical change in the culture medium. Plant Sci. 79:253-257. 
Has anyone tried using them for soil-grown plants?


  Jonathan D. Monroe           Associate Professor
  Department of Biology       office: 540-568-6649
  MSC 7801                       lab: 540-568-6045
  James Madison University       fax: 540-568-3333
  Harrisonburg, VA 22807   email: monroejd at jmu.edu

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