BiG PuFFer
Well-Known Member
Glasses wont help in the dark
Do Green Lights Work
- Thread starter Tim Johns
- Start date
hyroot
Well-Known Member
They do when the lights are on. I always wear grow glasses that filter the light when I'm in the garden or outside.
BiG PuFFer
Well-Known Member
Thats great, but im talking about turning green led rope lights on in the dark when i work on my plants for a little while. Sorry, i thought established my intentions.
BiG PuFFer
Well-Known Member
Because, sometimes its my only option.
Yodaweed
Well-Known Member
Then you need to change that, plan ahead better, don't disturb plants just really not a smart idea.
a senile fungus
Well-Known Member
Plants absolutely do "see" green light. It's how they "know" that they are being overcrowded, and causes stem elongation.
Plant Physiology
American Society of Plant Biologists
Green Light Stimulates Early Stem Elongation, Antagonizing Light-Mediated Growth Inhibition1
Kevin M. Folta
Additional article information
ABSTRACT
During the transition from darkness to light, the rate of hypocotyl elongation is determined from the integration of light signals sensed through the phototropin, cryptochrome, and phytochrome signaling pathways. In all light conditions studied, from UV to far-red, early hypocotyl growth is rapidly and robustly suppressed within minutes of illumination in a manner dependent upon light quality and quantity. In this study, it is shown that green light (GL) irradiation leads to a rapid increase in the growth rate of etiolated Arabidopsis seedlings. GL-mediated growth promotion was detected in response to constant irradiation or a short, single pulse of light with a similar time course. The response has a threshold between 10−1 and 100 μmol m−2, is saturated before 102 μmol m−2 and obeys reciprocity. Genetic analyses indicate that the cryptochrome or phototropin photoreceptors do not participate in the response. The major phytochrome receptors influence the normal amplitude and timing of the GL response, yet the GL response is normal in seedlings grown for hours under constant dim-red light. Therefore, phytochrome activation enhances, but is not required for, the GL response. Seedlings grown under green, red, and blue light together are longer than those grown under red and blue alone. These data indicate that a novel GL-activated light sensor promotes early stem elongation that antagonizes growth inhibition.
The first sensing of light transitions the etiolated seedling into a developmental program that prepares the plant for autotrophy. This process, photomorphogenesis, is typified by changes at the biochemical, molecular, and physiological levels that guide early plant morphology during establishment. One of the most conspicuous changes to occur during photomorphogenic development is an inhibition of hypocotyl (stem) growth rate. Ultraviolet, blue, red, and far-red light each rapidly inhibit stem growth within minutes of irradiation (Meijer, 1968; Gaba et al., 1984; Spalding and Cosgrove, 1989), making this rapid response an excellent reporter of light sensing and signal integration.
High-resolution imaging techniques have allowed monitoring of the growth inhibition process with high temporal resolution in the miniscule Arabidopsis seedling. These methods facilitated genetic tests to describe two critical parameters of the growth inhibition response: first, which photosensors mediate early growth inhibition, and second, precisely when specific photosensors contribute to this rapid response. These studies demonstrated that growth inhibition is dependent upon contributions from phytochromes, phototropins, and cryptochromes, often acting in a sequential and orchestrated manner (Parks et al., 2001a). In red light, growth inhibition is first imparted through phytochrome A (phyA) activation for 3 h before phytochrome B (phyB) exerts its influence and the effect of phyA wanes (Parks and Spalding, 1999). In response to blue light, inhibition occurs in at least two distinct phases that can be separated genetically, as well as by time course and fluence response (Folta et al., 2003b). The primary phase of growth inhibition is mediated by phototropin 1 (phot1;Folta and Spalding, 2001a), the autophosphorylating Ser-Thr kinase that mediates phototropism (Huala et al., 1997; Christie et al., 1998). The second phase of growth inhibition requires cryptochrome 1 (cry1) and cryptochrome 2 (cry2) as well as phyA and initiates after 30 min of continuous irradiation of 100 μmol m−2 s−1 (Parks et al., 1998; Folta and Spalding, 2001a, 2001b). In all cases studied, irradiation with monochromatic light induces growth inhibition. The timing of inhibition coincides closely with the translocation of phyA and phyB to the nucleus in red or far-red light (Hisada et al., 2000; Kircher et al., 2002), phototropin and cryptochrome phosphorylation in blue light (Reymond et al., 1992;Shalitin et al., 2002), as well as alterations in the global gene expression (Ma et al., 2001;Tepperman et al., 2001; Folta et al., 2003a).
Monochromatic green light (GL) has been shown to act as a signal in regulating specific facets of plant physiology, inhibiting seedling mass, plant cell culture growth, and light-induced gravitropic root elongation (Klein, 1992). Recently it has been shown that GL can reverse blue light-induced stomatal opening (Frechilla et al., 2000; Talbott et al., 2002, 2003; Eisinger et al., 2003). The GL response is mediated through a yet-to-be-defined photosensor, and genetic analyses suggest the response to be zeaxanthin based (Frechilla et al., 1999; Zeiger, 2000). Plant responses to GL may be initiated through known light sensors. Phytochromes and cryptochromes absorb GL and possibly influence light-induced events (Mandoli and Briggs, 1981;Lin et al., 1995b; Liscum and Briggs, 1995; Swartz et al., 2001). However, the action/response spectra for GL-induced responses exhibit a peak between 540 to 550 nm (Klein, 1964,1979; Steinitz et al., 1985; Reymond et al., 1992; Frechilla et al., 2000) and thus are incongruous with the absorption spectra for phytochromes, cryptochromes, and phototropins and the action spectra for the responses they govern (Christie et al., 1998; Ahmad et al., 2002). GL signals may also be a consequence of low-level coactivation of multiple sensory systems that together guide atypical physiological outcomes (Pepper et al., 2001).
In this report, high-resolution analyses of early growth kinetics have identified that GL irradiation causes a rapid increase in early stem elongation rate, a response that is contrary to that induced by all other light conditions studied. The transient growth promotion is evident within 15 min of irradiation, its magnitude is regulated in a dose-dependent manner, and it cannot be completely attributed genetically or photophysiologically to the described action of known photoreceptors. This report presents photophysiological and genetic characterization of a novel response to narrow-bandwidth GL.
Plant Physiology
American Society of Plant Biologists
Green Light Stimulates Early Stem Elongation, Antagonizing Light-Mediated Growth Inhibition1
Kevin M. Folta
Additional article information
ABSTRACT
During the transition from darkness to light, the rate of hypocotyl elongation is determined from the integration of light signals sensed through the phototropin, cryptochrome, and phytochrome signaling pathways. In all light conditions studied, from UV to far-red, early hypocotyl growth is rapidly and robustly suppressed within minutes of illumination in a manner dependent upon light quality and quantity. In this study, it is shown that green light (GL) irradiation leads to a rapid increase in the growth rate of etiolated Arabidopsis seedlings. GL-mediated growth promotion was detected in response to constant irradiation or a short, single pulse of light with a similar time course. The response has a threshold between 10−1 and 100 μmol m−2, is saturated before 102 μmol m−2 and obeys reciprocity. Genetic analyses indicate that the cryptochrome or phototropin photoreceptors do not participate in the response. The major phytochrome receptors influence the normal amplitude and timing of the GL response, yet the GL response is normal in seedlings grown for hours under constant dim-red light. Therefore, phytochrome activation enhances, but is not required for, the GL response. Seedlings grown under green, red, and blue light together are longer than those grown under red and blue alone. These data indicate that a novel GL-activated light sensor promotes early stem elongation that antagonizes growth inhibition.
The first sensing of light transitions the etiolated seedling into a developmental program that prepares the plant for autotrophy. This process, photomorphogenesis, is typified by changes at the biochemical, molecular, and physiological levels that guide early plant morphology during establishment. One of the most conspicuous changes to occur during photomorphogenic development is an inhibition of hypocotyl (stem) growth rate. Ultraviolet, blue, red, and far-red light each rapidly inhibit stem growth within minutes of irradiation (Meijer, 1968; Gaba et al., 1984; Spalding and Cosgrove, 1989), making this rapid response an excellent reporter of light sensing and signal integration.
High-resolution imaging techniques have allowed monitoring of the growth inhibition process with high temporal resolution in the miniscule Arabidopsis seedling. These methods facilitated genetic tests to describe two critical parameters of the growth inhibition response: first, which photosensors mediate early growth inhibition, and second, precisely when specific photosensors contribute to this rapid response. These studies demonstrated that growth inhibition is dependent upon contributions from phytochromes, phototropins, and cryptochromes, often acting in a sequential and orchestrated manner (Parks et al., 2001a). In red light, growth inhibition is first imparted through phytochrome A (phyA) activation for 3 h before phytochrome B (phyB) exerts its influence and the effect of phyA wanes (Parks and Spalding, 1999). In response to blue light, inhibition occurs in at least two distinct phases that can be separated genetically, as well as by time course and fluence response (Folta et al., 2003b). The primary phase of growth inhibition is mediated by phototropin 1 (phot1;Folta and Spalding, 2001a), the autophosphorylating Ser-Thr kinase that mediates phototropism (Huala et al., 1997; Christie et al., 1998). The second phase of growth inhibition requires cryptochrome 1 (cry1) and cryptochrome 2 (cry2) as well as phyA and initiates after 30 min of continuous irradiation of 100 μmol m−2 s−1 (Parks et al., 1998; Folta and Spalding, 2001a, 2001b). In all cases studied, irradiation with monochromatic light induces growth inhibition. The timing of inhibition coincides closely with the translocation of phyA and phyB to the nucleus in red or far-red light (Hisada et al., 2000; Kircher et al., 2002), phototropin and cryptochrome phosphorylation in blue light (Reymond et al., 1992;Shalitin et al., 2002), as well as alterations in the global gene expression (Ma et al., 2001;Tepperman et al., 2001; Folta et al., 2003a).
Monochromatic green light (GL) has been shown to act as a signal in regulating specific facets of plant physiology, inhibiting seedling mass, plant cell culture growth, and light-induced gravitropic root elongation (Klein, 1992). Recently it has been shown that GL can reverse blue light-induced stomatal opening (Frechilla et al., 2000; Talbott et al., 2002, 2003; Eisinger et al., 2003). The GL response is mediated through a yet-to-be-defined photosensor, and genetic analyses suggest the response to be zeaxanthin based (Frechilla et al., 1999; Zeiger, 2000). Plant responses to GL may be initiated through known light sensors. Phytochromes and cryptochromes absorb GL and possibly influence light-induced events (Mandoli and Briggs, 1981;Lin et al., 1995b; Liscum and Briggs, 1995; Swartz et al., 2001). However, the action/response spectra for GL-induced responses exhibit a peak between 540 to 550 nm (Klein, 1964,1979; Steinitz et al., 1985; Reymond et al., 1992; Frechilla et al., 2000) and thus are incongruous with the absorption spectra for phytochromes, cryptochromes, and phototropins and the action spectra for the responses they govern (Christie et al., 1998; Ahmad et al., 2002). GL signals may also be a consequence of low-level coactivation of multiple sensory systems that together guide atypical physiological outcomes (Pepper et al., 2001).
In this report, high-resolution analyses of early growth kinetics have identified that GL irradiation causes a rapid increase in early stem elongation rate, a response that is contrary to that induced by all other light conditions studied. The transient growth promotion is evident within 15 min of irradiation, its magnitude is regulated in a dose-dependent manner, and it cannot be completely attributed genetically or photophysiologically to the described action of known photoreceptors. This report presents photophysiological and genetic characterization of a novel response to narrow-bandwidth GL.
So it sounds like it would be fine for short periods. I would imagine it would have to be on a lot to cause stem elongation in this case. I did publish the app, by the way, and will probably test it on a separate environment or on only 1 plant. I would suspect... let's say you left your wallet in your grow room - that it would be safe to use it to grab your wallet and get back out.
Anyway, if anyone wants to give it a try or have it on hand in case they do run into such an emergency where they have no choice but to go in while it's dark... the app's free, no ads or promotions. Nothing but solid green... https://play.google.com/store/apps/details?id=co.tjohns.tim.greenhydroponiclight&hl=en
Anyway, if anyone wants to give it a try or have it on hand in case they do run into such an emergency where they have no choice but to go in while it's dark... the app's free, no ads or promotions. Nothing but solid green... https://play.google.com/store/apps/details?id=co.tjohns.tim.greenhydroponiclight&hl=en
nomofatum
Well-Known Member
Keep it dim and as short as possible. Green only buys you about 20% more brightness before stress/herm/...
When I need to work in the room during dark I turn a hall light around the corner from the grow on. The little bit of light that bounces around the corner is just enough to see, like a dim moon light.
When I need to work in the room during dark I turn a hall light around the corner from the grow on. The little bit of light that bounces around the corner is just enough to see, like a dim moon light.
BiG PuFFer
Well-Known Member
Yodaweed
Well-Known Member
The studies we linked are backed by NASA, your video is by some idiots from monster gardens trying to sell you products.
BiG PuFFer
Well-Known Member
What about black light?
Yodaweed
Well-Known Member
Just leave it alone when it's sleeping man what do you not understand.
BiG PuFFer
Well-Known Member
Dont be a dick. I need to get in there sometimes during dark periods because of my work schedule. You cant understand that?
Yodaweed
Well-Known Member
Then you need to plan ahead, do you not understand disturbing plants during sleep = no no? I have tried to be nice and you just won't listen. I am done with this tried to help but it's hard to talk to someone that doesn't listen. Go disturb your plants during night fuck it, not effecting my grow.
BiG PuFFer
Well-Known Member
Good, beat it. Your not helping. You dont understand my problem. I dont sit around all day and watch plants grow. They just fliped my work schedule and i can only be there for like 10 min. I need to get in and prune, change res ect.
I had no control over that. Of course ideally i would not fuck with them at night. I have to, so im looking for the best way to not be disruptive, asshole.
TheOmenCrow
Member
The green LED headlamps are like $15. You can work on your plants with little risk to herming your plants. As for stringing up green LED's no one has done that from what I can see so you are def going to run into apprehension from people about doing it. Why don't you try it? If it fails you can have firsthand experience and knowledge to share with others which is what being part of community is all about, yes? And if it does works you become a pioneer! Either way we all get the information we need. Win, win.
hyroot
Well-Known Member
He basically suggesting you change your lighting schedule to your schedule so your able to work while they are awake.
You shouldn't bothor the plants when they sleep. All that's doing is causing stress. Which can produce seeds, hurt yield, and even make them finish faster in turn hurting yield in another way and even attract pests.
It's not going to hermie your plants unless the genetics are not stable. But it will stress them out.
I used to rock those green led head lamps and go in there 10 years ago. Then learned about how plants perceive and absorb light.
BiG PuFFer
Well-Known Member
Ok. Thanks for that answers. Can i just switch the cycle or do it gradually? Also it is possible my work schedule will change again. Things are kinda crazy now.
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