g1ithc

here is an excerpt from "The biotechnology of cannabis" I found very interesting. Hope someone else does too!

"There also exists within Cannabis and other plants a protein called cytochrome (Bou-
Torrent et al., 2008). Cytochromes are protein molecules that harbor a chromophore, a
color-absorbing molecule. Depending on the wavelength of light striking the plant
surface, the phytochromes are converted between different states or forms. When the
phytochromes receive red light (660nm) they become the Pfr type, which is active and
allow flowering to proceed. If far-red light (730nm) is detected the phytochrome becomes
the Pr type. The Pr type is a biologically inactive form and so flowering cannot proceed.
An indoor gardener can use this principle to initiate flowering even in a light cycle of 14
or more hours. During the dark period of a plant’s life, they can be given a brief pulse of
red light. This changes the Pr type into the Pfr form and allows flowering to begin.
Interestingly, these same phytochrome proteins play a crucial role in seed germination.


For instance, the Pfr form of phytochrome allows germination to proceed. Therefore, if
one is having difficulty germinating recently purchased Cannabis seeds, they should try
exposing them to a short period of red light before planting them."

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mikewho

So anything betwen 660-729nm activates germination or flowering, but 730nm + de-activates it? So is it possible to de-activate the flowering of the plant, and temporarily limit it to only growth.... in effect, creating a .... man eating sized plant? Imagine those giant pumpkins, like the ones in the world record books. If this were to work, then you could re-activate the plant using the red light, and cause it to go into flowering. Then when in its flowering stage, keep going back and forth activating and deactivating to elongate the process of its flower growth. I would imagine that doing this would slow down the process of bud development in such a way that you could concentrate on individual phases of flower maturity.. thus creating very maximum potency + ridiculously huge buds, in ridiculously huge quantities.

aussie grow

I dont think that would be the optimal way to produce the tight dence buds that we enjoy.

But I can see the use of far-red light (730nm) to prolong the growth period in auto flowering plants, maybe even able to clone them with the use of this now that could be worth investigating.

mikewho

I was thinking that if you were to start and stop the process of flowering by maybe one day, then you could put maximum energy into the flowers development x2.

Do you get what I am saying? I do not know if it would affect the density of the buds if we calculated the proper amount of time inbetween far-red and red intervals, basically we create a cyclic ratio kind of like we do with the light(s,) but for different purposes of course, other then forcing the plants into flowering etc...

Also, to further expound into the the veg idea, which you had vision as well, I think that it would definitely be possible to grow a plant around an entire room. To further this theory, in layers around the walls. Think of a single plant wrapped around a wall, with several other plants layered above and below it, with the lights in the middle. This would be accomplishable if we were to master the 730nm .............. in theory.

aussie grow

The thing is the constant switching from grow to flower may produce elongated but not very dense buds, you are talking about using both in the same photo-period T

The main use that i can see coming from this is to allow you to run the lights like an auto flower using the red light (660nm), this in its self is a great innovation if it works as you could in theory reduce flowering times by up to 20%

Or alternatively you could use the far red (730nm) outdoors in the tropics to allow longer vegetative growth IE: equatorial regions receive 12/12 constantly, and again as I stated for use with cloning auto flowering strains.

knna

Its exactly the opposite: 660nm red light converts Pr to Pfr, and that inhibits flowering, while 725nm (far red) converts Pfr to Pr, and allows fowering.

But flowering is not only affected by Phytochromes signalling, there is other receptors involved. And there is 5 types of Phytochromes, some of them arnt photoconversible.

Some people is experimenting with red light (660nm) supplementing during the dark period, for increased photosynthesis, but adding at the same time larger amounts of far red light to keep the equilibrium of Pfr/Ptot low enough to keep the plant flowering. It works, but creates stress on plants, some stranges morphological changes and over all, is very little efficient, as the far red have a very minimal photosynthesis ability, and in terms of weight added respect watts used it may be considered mostly a waste.

In theory, November issue of High Times should include an article about this.

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