Scientist force flowering during long days

[Samson4]

Intro
I haven't heard or read much about this technique up until I stumbled across a couple old experiments. These experiments were conducted between 1930-50's while scientist where trying to discover what part of the plant is light sensitive and triggers flowering.

The Experiments
What the scientist did was take short day plants during their "veg" cycle. They would then isolate a leaf on the plant and shorten the day length of that leaf. They blocked the light by taping black construction paper to both sides of a single leave.

What they found
They found that they could induce flowering by blocking all but 8 hours of light from one leaf of the plant. This single leaf would produce the flowering hormone in a suficient amount to trigger flowering.

The Theoretical Application to Our Purpose
If the experiment holds true for cannabis it will allow 4 major advantages:
1. Long flowering sativas can now be grown further away from the equator than usual.
2. Flowering and vegetation can occur under the same light.
3. A plant can be flowered under (18/6, 20/4 etc..) hours of light increasing yield and possibly reducing stretch.
4. Ruderelis genetics don't have to be involved to harvest before August.

I have not used this technique; but, if anyone has our has knowledge on the subject please do so.

 

[Abja Roots]

Very Interesting. Will be checking in to see what more knowledgeable minds have to say on the subject.

If you have a link to the study in it's full detail, please post it up.

 

[FoCo(No.Co)]

Lots of growers on these boards have been doing this for a long time... you can cover the plants or just bring them inside at the same time everyday... or if you have lots of money to invest you could put a retractable cover on a timer and put it over your greenhouse.

 

[Samson4]

Not what I'm talking about here. I'm talking about covering just one leave, not the entire plant. Please reread my post.

Abja:
http://books.google.com/books?id=xY...nepage&q=short day plants chailakhyan&f=false

One of the leading scientist was M. H. Chailakhyan.

 

[HighDesertJoe]

Very interesting
I'm going to start making
ONE LEAF BLACK OUT COZY'S

 

[Honkytonk]

Look up Phytochrome manipulation.

Covering 1 leaf won't work. Even covering a branch flowers only that branch, not the whole plant.

 

[Grizz]

not sure it works on mj. i saw a pic of a plant that was outside by a street light, half of the plant was in darkness for 12/12, the other half was under the street light, the half that was in the dark flowered and the other half dident.

 

[Samson4]

Phytochrome manipulation doesn't have merit here. Especially indoors if wavelengths stay constant.

Why do you say one branch will flower? If you have done/witnessed this process please post details. Otherwise your post is wasted space.

 

[Samson4]

not sure it works on mj. i saw a pic of a plant that was outside by a street light, half of the plant was in darkness for 12/12, the other half was under the street light, the half that was in the dark flowered and the other half dident.

I see. That's very interesting. In this case, each half is sending/receiving flowering hormones. I'm going to run an experiment on this during this growing season.

 

[smokefrogg]

i'm not a scientist, but i have seen outdoor plants where half of it is full on flowering and the other half is full on vegetating, the flowering side being in a spot getting shade throughout part of the day. this tells me that covering or shading 1 leaf isn't going to make much of an effect...it would be neat if it worked that way though

 

[AmeriSkunk]

there is a difference in shade and total darkenss, the plant knows its in the light while its in the shade.

And is it just me or is smokefrogg's post confusing in the same breath he said he has seen this happen because of shade, but he doesnt think blacking out a leaf will work??

 

[Samson4]

I'm liken all the input. So it seems to be common to see plants partial flower because of shade. I wonder if it's the lack of total darkness that's not getting the hormones to diffuse throughout the entire plant.

Ameriskunk:
Yep. But in all of this, there seems to be only evidence supporting the ability of the plant to flower even if part of the plant is receiving long day hours.

 

[Crusader Rabbit]

I wonder if it's the lack of total darkness that's not getting the hormones to diffuse throughout the entire plant.

Sounds like flowering hormones simply don't diffuse throughout the plant.

 

[ijim]

From off of the top of my head. I remember that flowering hormones are created equally during dark periods throughout the life of the plant. But longer light periods degrade the hormones to a point that they retard flowering. Sounds possible. Need to make some booties and play around.

 

[smokefrogg]

there is a difference in shade and total darkenss, the plant knows its in the light while its in the shade.

And is it just me or is smokefrogg's post confusing in the same breath he said he has seen this happen because of shade, but he doesnt think blacking out a leaf will work??

in my situation half of the entire plant was flowering and the other half was not, it was a very large plant about as wide around as a vw bug

the article is about shading 1 leaf in order to cause the whole plant to flower

this is entirely different than the entire plant flowering due to a portion of it being in a darker or shaded area such as what the article was speaking of

 

[AmeriSkunk]

I understand why someone would want to achieve this, but I do think that plant genetics, not strain but type as in Cannabis, idk if cannabis would do this and im sure different type of plnts produce flowering hormones differently.

What people really need to be messing around with is genetic splicing... that is where the future is at... making something produce thc and otehr cannabanoids that doesnt normally produce it.. you could also manipulate the genes that controll the thc and other oil producing parts of the plant. I would love to have a shelf in my house when im 60yrs old(25 now) that contains all of the isolated psychoactive compounds contained in cannabis resin. then i feel I could probably medicate myself for any ailment i ever encounter. I believe in the power of this plant in high doses. I was actually thinking about this a day ago, I have a small spot of skin cancer I have always knows about but never done anything about. I didnt even know it was cancer until a month ago....

I recently seen the results from the study of some college that found that high doeses of hash oil, recessed some cancer cells. a few years ago I was put on probation and forced to stop smoking, the cancer flared up all the time, now that I use cannabis all the time in high doeses I have not had a flair up since.. I did not believe the story about the guy and the "hemp oil" but im saying from my own personal experience that i do believe that withing those 400 chemicals there is potentially a cure or at least somewhat of a remedy for every ailment know to people and to animals... Cannabis, I believe is that big of a part of everyones life, some people just dont see it or arent willing to accept it yet.

Im sorry I know i am soooo far of topic, i know i got on one then and yes, hell fucking yes i am gone off the f.m. og, lol. But in all seriousness, I believe that in high enough doses cannabis can make you body function far better than it ever could without it. Some people may laugh and think this is all a joke but thats only because they havent experienced cannabis's power in this way, they have only experienced in for getting high...

 

[Sam_Skunkman]

This work was debunked 25 years ago, in the case of Cannabis.
If you have plants in a greenhouse with a darkening system and a single branch sticks out of the darkening and is exposed to long day photoperiods the branch will not flower while the rest of the plant in the darkening will. In reverse a single branch of a plant under long photoperiod will flower if just the branch is under short hours of light. The rest of the plant stays Veg.
I have seen this many times and did experiments to confirm it.
If you want to flower under long summer days you need to use Auto-flowering varieties, which I don't really like, or try and find a very, very, determinate variety that one it starts flowering with a week or two of short hours of light, it will not revert to Veg. even under long photoperiod.
I don't like Auto-Flowering because although they seem to start flowering regardless of photoperiod, they never seem to go to the final frosting stages, they seem to just keep making new flowers, not really finishing the ones they have. I like frosty mature finished buds, not immature flowers that never really finished, or fully frosted out. I want quality not quantity.....
But to each their own.....

-SamS

Intro
I haven't heard or read much about this technique up until I stumbled across a couple old experiments. These experiments were conducted between 1930-50's while scientist where trying to discover what part of the plant is light sensitive and triggers flowering.

The Experiments
What the scientist did was take short day plants during their "veg" cycle. They would then isolate a leaf on the plant and shorten the day length of that leaf. They blocked the light by taping black construction paper to both sides of a single leave.

What they found
They found that they could induce flowering by blocking all but 8 hours of light from one leaf of the plant. This single leaf would produce the flowering hormone in a suficient amount to trigger flowering.

The Theoretical Application to Our Purpose
If the experiment holds true for cannabis it will allow 4 major advantages:
1. Long flowering sativas can now be grown further away from the equator than usual.
2. Flowering and vegetation can occur under the same light.
3. A plant can be flowered under (18/6, 20/4 etc..) hours of light increasing yield and possibly reducing stretch.
4. Ruderelis genetics don't have to be involved to harvest before August.

I have not used this technique; but, if anyone has our has knowledge on the subject please do so.

 

[Samson4]

Thank you all for your input. I guess we can close the door on this technique.

I'm not a big autoflower fan myself. By that I mean ruderelis. The strains I have tried all seemed to be very limited in the high department. I would like to work with Zamal and find a autoflower pheno and cross it to a pheno in a batch of durban f2's I made from afropips stock. It has a creamy vanilla smell and puts out lovely little foxtails covered in frost.

 

[trichrome101]

why dont you just follow the procedure and see for your self.I would do it but im already into flower.I doubt that it will work but if it did that would be awsome