light spectrums and phototropism

Barry Meatyard Barry.Meatyard at CSV.WARWICK.AC.UK
Thu Jan 23 11:54:07 EST 1997

>To:plant-ed at net.bionet
>From:Barry.Meatyard at (Barry Meatyard)
>Subject:Re: light spectrums and phototropism
>>From:Barry.Meatyard at (Barry Meatyard)
>>Subject:Re: light spectrums and phototropism
>>On 21st Jan Chris and Jenny Lever wrote:
>>>I am conducting an experiment for bio 102 measuring the effects of
>>>giving plants a choice between filtering out all red light and all green
>>>light.  The plants will be in a box with each light coming from opposite
>>>sides. We are using fast growing radishes.  Anyone know of a filter
>>>source or data from previous experiments of this type?
>>We use a simple protocol to investigate this type of response in the Science
>>and Plants for Schools Programme (SAPS) in the UK.
>>Our technique is to use black 35mm film canisters (Kodak or similar) with two
>>small holes cut with a leather punch on opposite sides about 1cm down from
>>the open end. Over the holes is then taped (with Scotch or similar clear
>>adhesive tape) a small square of coloured gel. You can set up red vs blue,
>>red vs green green vs blue. I use theatrical lighting gels - these seem to
>>have a fairly narrow wavelength transmission effect. Off the top of my head
>>I'm not sure of the precise coding of these - I have a 'good' red, blue and
>>green, but there is a whole wealth of investigations that could be done with
>>a range of gels using this simple apparatus. The campus theatrical lighting
>>guys are the people to talk to - the great thing about using small holes in
>>film cans is that the filters need only be 1-1.5cm square.
>>We use Sinapis alba seedlings rather than rapid radish or rapid Brassica -
>>cost being the major element, and S.alba will germinate and give results
>>within 4 days - about the same as rapid radish. I put a cm. or so of
>>moistened fine compost in the bottom of the can, two or three seeds then
>>close the lid. The cans are then placed in a wooden rack which is fitted
>>midway between two fluorescent (daylight) tubes with the 'windows' about 5cm
>>from, and facing, each tube. Leave for 4 days and observe!
>>Results are always constant - I won't tell you what they are until you have a
>>go yourself!
>>For further details of the SAPS programme visit:
>>Best wishes,   Barry
>>Dr.Barry Meatyard                       Tel: 01203 524228
>>Science and Plants for Schools          Fax: 01203 523237
>>Institute of Education                  Email: barry.meatyard at
>>University of Warwick
>>CV4 7AL

Dr.Barry Meatyard                       Tel: 01203 524228
Science and Plants for Schools          Fax: 01203 523237
Institute of Education                  Email: barry.meatyard at
University of Warwick

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