Green light absorption
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Red and far red Light citations
1.The relationship between red and far-red light on flowering of the long-day plant, Lemna gibba $$$
2. Specific Functions of Red, Far Red, and Blue Light in Flowering and Stem Extension of Long-day Plants
3.Red Light Affects Flowering Under Long Days in a Short-day Strawberry Cultivar
4.EFFECTS OF BLUE AND RED LIGHT ON STEM ELONGATION AND FLOWERING OF TOMATO SEEDLINGS $$$
5.Effects of Red Light Night Break Treatment on Growth and Flowering of Tomato Plants
6.CONTROL OF GROWTH BY LIGHT âFreshman syllabusâ
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One more one cannabis and hops, I found one in English
Move on up, itâs time for changeâmobile signals controlling photoperiod-dependent flowering
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my german is good enough to fix the grammar from a google or babylon translation into english
I will half to go to my paper files. And make a copy. I have given other sources above that say basically the same thing.
It basically talks about the mythical florygen as a Far Red shift response in short day plants. And how the addition of a far red light at the shortening of day length give a stronger bloom response in plants. One of the test subjects was glasshouse hops and increased blooming response as a factor in heavier bud set.
Do you really want me to pull this paper or are you yanking my chain? 
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Yes, as hops is a cousin of cannabis Iâd like to be able to quote directly from a proper paper rather than from someone on one of the forums.
What Iâm wondering is if, even without the pfr:r thing and PAD, will running an 11 hour day that ends with a 15 minute exposure of 730 alter the effect of the 36-48 hour dark at the turn from veg to flower?
AND, why do you refer to florigens as âmythical?â
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Florogen is an effect and not a substance. Early research was looking for a compound. They never found one. So later work looked at the effect of light and had success as an effect.
As for the papers I will have to go to my basement for paper. This will require help from my wife. I donât move very well. So expect delay. I will try find the paper online and you can pay for it. It will be about $50.
I use to get all my journal articles for free when I worked. My office paid the 1500 dollars a year for access.
So some time please and remind me every few weeks.
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Then why do I get stronger, faster flowering and shorter âstretchâ with a 36-48 hour dark at the turn.
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I donât know the factors of input. I do know from controlled studies this is not what is being observed.
Research needs to be repeatable by others. The results you are showing, other growers and reseaechers should be able to reproduce. I have not seen such results ever, with regards to light.
I would like to and am open to proof. We are talking about science not religion. Religion is the proof of dogma. Science is the proof of disbelief, if you can prove a truth I will follow. But, I can not prove a negative. Give me a controlled study.
I will find the hops paper link. And post the link.
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Would you acknowledge that sometimes scientists donât see things because they donât know what they are looking at? It doesnât exist until it has been isolated and identified. In the more than three decades since I first speculated about, tried and wrote about giving cannabis 24-72 hours of darkness at the turn to induce a harder/faster onset of flowering and/or substantially diminish the stretch at transition to flowering, thousands of people have done it. Iâm fairly sure you can find it in the forums as well. There are very few cultivars of cannabis it doesnât work with.
Dear @FarmerintheSky ,
If the process is great work, with one of the Universities and propose a study. You have a hypothesis.
Create the experimental design
Without this process, what your telling me is hearsay. It is merely anecdotal. For me itâs like saying âthere was a big flood and everyone died, but this guy named Noah and his familyâ or the equivalent of Homeopathic cannabis growing
Here is my comic relief Homeopathic Pot Growing
Give me proof in an acceptable formate! You ask me for proof and papers. Exstend the same respect
From the voices in my head
Ethan
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I understand, and agree with, what youâre saying. Given funding and more bandwidth Iâd be happy to set it up thusly.
The hypothesis, in English rather than academese is is that there is
A) an, as yet unidentified, morphogenic trigger/phyto-chemical reaction going on in cannabis and presumably other short day plants during the onset of florescence following reduction of photoperiod; and
B) that the effects of this unidentified phyto-chemical reaction are significantly more profound with greater duration of the dark period.
The experiment:
For legal reasons it might have to be hops or hackberry, cannabisâ two closest cousins which need to be used.
I would have separate but as close to identical as possible grow chambers.
These would include one where the plants would be switched, as in common in cannabiculture, from long days to short days abruptly. This would be a change in photoperiod from 20 on: 4 off (Diminishing returns only plays in if they diminish below acceptable ROI.) to 11 on: 13 off;
Another one given a 24 hour dark then brought into the short day regimen;
Another one given a 36 hour extended night, and
another one given a 48 hour extended night.
Plants will be monitored visually at 6 similar spots on each plant, measured for vertical growth (The stretch) in each chamber and chemically to see how they compare in terms of auxins, etc.
Total time from triggering of floral phase to harvest will be recorded.
Does that sound like a workable study to you?
I think it is a workable study. A bit light on details. University of California, university of Oregon, University of Washington and University of Colorado are all looking for good studies in cannabis to support. The industry.
I have read some of your published work. You right very well
Write your best, and produce a detailed detailed hypothesis. That is the major starting point.
We need to edit the hell out of it so the language is exact. You can use any technical term or common term to mean more than one thing without defining the meaning.
Experimental design is next. This also must follow an exact formula. This stage we invite peer review of the proposed design. Everyone will be an ass at this stage. They will be good, ideas. My guess it will be in the measurement area. What you measuring, how are you measuring it. How will you randomize the plant selection. What are the anticipated statistical methods. There are a lot of math people here to help. I would just saying to start that you anticipate using chi square statistics to show significance of results. Light measurement is going to be key. We have vendors who are light manufacturers. Once we have a good design. We hit them up for monitoring equipment on loan. Plus the environmental monitoring companies for auto monitoring. Temperatures are going to be critical to monitoring, because red and far red can come from extraneous sources and can be followed in as a byproduct of temperature. I think there is a paper in food science journal that found a flaw in a study because of temperature.
On an aside a number of land grant schools have special programs for the plus 60 crowd, to give real degrees MS and sometimes PhD for free for quality work.
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UO or OSU? Generally Universities do not look favorably on study proposals, dealing with Schedule I Controlled Substances, from uncredentialed ex-felons.
I think the state land grant college. Look up elder learning. They are not allowed to ask about your past. The programs are based on life experience. You generally have to write an easy one why you qualify. A masters of art or science is awarded at completion of the next step. You can do a masters of science thiesus or under special circumstances a pH D. The program requires that you be at least 60 years old and you have to pass the GRE for your field of study.
The program was created in the 70âs to allow service men from WW2, who did not take advantage of the GI bill to get life work recognition. We had a couple of people at my first graduation were awarded advanced degrees.
One was on low impact pig farming as a part of substance farming. It was a Master of Science in Agricultural Economics. The gentleman was 72 years old. I went to his graduate seminar. He cried that after the war he had to take care of his family on the farm. His father had died while he was away. His duty hadnât stopped. He had to take care of his siblings. They all graduated college. His wife, children and grandchildren where all there. Plus, his siblings. Cool study, great party. We had cake and punch! I got credit for attending and writing up the a summary for my graduate seminar. It was a nice research paper on being successful in a life style that is now dying.
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On about the third page is the florigens answer
|http://genesdev.cshlp.org/content/21/19/2371.full.pdf+html
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If you read closely Florigen was Hypnotized. They have never isolated a compound called florigen. Lots of work was done in the 60âs and 70âs trying. The final conclusion is Florigen is genetic process in short day length plants. We know that we can improve flowering by implementing a light shifting to include far red. I think there is a paper in American Journal for Horticulture Science from the early 1980âs, titled âthe end of the search for mythical florigenâ.
and that, at least empirically, based on a very large number of anecdotal reports, providing an extended dark period at the initiation of short days seems to shorten the transitional period and in doing so reduce internodal spacing.
When the Weigel and Araki groups (Kardailsky et al.1999; Kobayashi et al. 1999) cloned the FT gene, both overlooked that FT mRNA abundance has a circadian cycle. Since CO mRNA had been reported to accumulate at the shoot apex, where flowers are produced (Simon et al. 1996), the focus at the time was on processes thought to be much downstream from the photoperiodic signal. It was therefore a major advance when it was discovered that FT mRNA expression is not only much higher in long days, but also has a circadian pattern, with peak levels during the second half of a 24-h cycle (Harmer et al. 2000; SuĂĄrez-LĂłpez et al. 2001). There is very little FT expression in short days, but upon transfer from short to inductive long days, FT is immediately induced in a CO-dependent manner, and returning plants to short days causes FT expression to subside within a day, indicating a very immediate effect of day length on
FTmRNA accumulation (Imaizumi et al. 2003; Corbesier et al. 2007).
Is this across the board for all cultivars of cannabis? Probably not. For science if it isnât proven by properly conducted experiment it isnât proven. However, science can also deafen us to the ear of common-sense. It well behooves experimenters to understand that there may be things present they arenât looking for because they donât know that those things exist.
This is particularly true in photobiology. Politically it would be easiest to expand the already somewhat-supported PBAR that included UVB and near infrared. In the case of the latter because it does affect transpiration and therefore the rate of uptake. Any wavelength of light which affects our plantsâ biology is something we need to understand the effects of.
When the Weigel and Araki groups (Kardailsky et al.1999; Kobayashi et al. 1999) cloned the FT gene, both overlooked that FT mRNA abundance has a circadian cycle. Since CO mRNA had been reported to accumulate at the shoot apex, where flowers are produced (Simon et al. 1996), the focus at the time was on processes thought to be much downstream from the photoperiodic signal. It was therefore a major advance when it was discovered that FT mRNA expression is not only much higher in long days, but also has a circadian pattern, with peak levels during the second half of a 24-h cycle (Harmer et al. 2000; SuĂĄrez-LĂłpez et al. 2001). There is very little FT expression in short days, but upon transfer from short to inductive long days, FT is immediately induced in a CO-dependent manner, and returning plants to short days causes FT expression to subside within a day, indicating a very immediate effect of day length on
FTmRNA accumulation (Imaizumi et al. 2003; Corbesier et al. 2007).
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