cbdhemp808
Well-Known Member
They are pigments... phytochrome red (Pr) and phytochrome far red (Pfr). They function as a seesaw: either they are in balance, or one outweighs the other...
Red-headed Hobbit on the left is Pfr, outweighing his friend red-coated Pr, and exclaiming "hooray, no flowering yet!". Hobbit in the center is sad because he has to wait for the pipe weed to come around. Notice the lighting in the background... Pr is kept "up" because of bright light.
"Pr absorbs red light between 660 and 760 nm and Pfr absorbs far red light between 760 and 800 nm."
During the dark period (scotoperiod), Pr naturally builds up (Pfr is converted to Pr). After several nights in a row of this, flowering phase will be initiated. However, one flash of light during the scotoperiod that contains the red wavelength (660nm) will cause the Pr to be converted back into Pfr, all at once, and will prevent or reverse flowering.
It is the sufficient presence of Pfr that keeps the plants from flowering. When cannabis is grown outdoors under natural light conditions, Pr builds up (and Pfr diminishes) when the nights get long enough, typically about 10.5 hours of darkness for most photoperiod cannabis strains.
Red-headed Hobbit on the left is Pfr, outweighing his friend red-coated Pr, and exclaiming "hooray, no flowering yet!". Hobbit in the center is sad because he has to wait for the pipe weed to come around. Notice the lighting in the background... Pr is kept "up" because of bright light.
"Pr absorbs red light between 660 and 760 nm and Pfr absorbs far red light between 760 and 800 nm."
During the dark period (scotoperiod), Pr naturally builds up (Pfr is converted to Pr). After several nights in a row of this, flowering phase will be initiated. However, one flash of light during the scotoperiod that contains the red wavelength (660nm) will cause the Pr to be converted back into Pfr, all at once, and will prevent or reverse flowering.
It is the sufficient presence of Pfr that keeps the plants from flowering. When cannabis is grown outdoors under natural light conditions, Pr builds up (and Pfr diminishes) when the nights get long enough, typically about 10.5 hours of darkness for most photoperiod cannabis strains.