so what hormoneS ? there aren't any known plant hormones that trigger flowering. waffle around the words all you want but florigen is a myth.
Yet another UV thread
- Thread starter canadian1969
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and as a science guy I am telling you there aren't any known hormones that cause flowering.
auxins such as Indole Acetic acid and Indole butyric acid effect apical dominance, stem elongation and rooting.
they do not effect flowering.
nachooo
Well-Known Member
Auxins plays a role in sexual determination..., auxins works in tandem with citokinins also...
this text taken from bilogy site:
Auxins:
In short day plants (SD) like Kalanchoe, Xanthium, Chenopodiumauxin inhibits flower initiation and the effect is pronounced when it is applied during the dark period. If auxin is applied after the photoinductive cycle, it increases floral differentiation. However, in Long day plants (LD) like Calendula, Namesia, etc. exogenous application of auxin inhibits flowering.
But the flowering was promoted in several other LD plant like Silene, when the auxin treatment was given under low-light intensity. Further, it is also reported that auxin-induced effect could be replaced by increasing the number of photoinductive cycles. The application of antiauxin also counteracted the auxin effect.
By far majority of the experiments have been conducted on the auxin-induced inhibitory effects of SD plants. The general assumption is that auxin(s) interferes with the photoperiodic reactions which occur in the leaves and hinder the synthesis of florigen. Most recent studies have indicated the role of auxin during later stages of flower induction in shoot apex.
One of the suggested possibilities is that auxin is metabolized in the new biosynthetic pathways at the apex. That these biosynthetic pathways are triggered by photoperiodism. Promotion of flowering by the auxin has been reported in Citrus, Litchi, Ananas, etc.
Similarly when the seeds of different cereals are soaked in auxin flower initiation is induced. Auxin treatment also increases vernalizing effects in some plant species.
So...you see they are a lot involved in flowering process...not only in stem elongation and apical dominance
And the other clasical hormones...are even most involved in flowering...
from the same site:
Gibberellins:
Gibberellins have been shown to induce flowering in several plant species. They have been demonstrated to cause flower initiation in LD plants like Beta, Brassica, etc. Different species respond differently to different gibberellins. In some LD plants the increased flowering may be associated with the elongation of internodes caused by GA.
In L—S—D plants glibberellins can substitute for LD. On the contrary SD plants fail to respond to GA. GA3 has been shown to substitute for cold treatment in some Chrysanthemum species. K.K. Nanda and his students have shown in Impatiens, which is an obligate SD plant, that GA3 could completely substitute for the dark period. Similarly promotion of flowering has been induced by GA in Kalanchoe.
From studies conducted on several species, it has been inferred that GA affects the expression of flower stimulus at the shoot apex rather than leaves. For instance, it increases the mitotic activity in the subapical meristem and thus becomes more responsible to photo-inductive conditions.
Cytokinins:
In Chrysanthemum sp. flowering is accelerated by the simultaneous application of benzyladenine and GA5. The former is also able to overcome the inhibitory effect of auxin in flower initiation. Cytokinins have been shown to promote flowering in Wolffia. There is a view thatcytokinins redirect the flow of assimilates essential for the formation of flowers to the shoot species.
Ethylene:
This hormone has been shown to inhibit flowering when applied in inductive short periods. The effect was more pronounced when given to the cotyledons. The effect of ethylene is confined to the leaves. Ethylene could induce flowering in several cereals. Similarly, the effect of ethylene in stimulating flowering in pineapple and some mango varieties has also been demonstrated.
In recent years, H. Y. Mohan Ram and his students at Delhi University have conducted extensive investigations on the hormonal control of sex expression in Cannabis. For instance, the application of gibberellins could induce male flower formation in genetically female plants of Cannabis sativa whereas treatment of male plants with ethephon resulted in the initiation of female flowers.
Later detailed histological studies in the treated plants showed that feminization of the flowers occurred through the production of a transient intersexual condition. It was further demonstrated that the original sex manifested itself when the effects of ethephon were worn out. The application of ABA also favoured femaleness in Cannabis.
The exogenous application of other major growth substances like morphactins, MH and TIBA have been shown to influence the development of sex organs in monoecious, dioecious and hermaphrodite species.
So well... hormones dont make flowering happen like magic...but are essential to the process
canadian1969
Well-Known Member
Anyone care to take a stab at my heatsink questions from earlier?
canadian1969
Well-Known Member
Photon Flinger
Well-Known Member
Sure you are. Just like gg is an expert grower because of his 12 years growing experience and many likes on his youtube channel!
A nachooo pointed out, several hormones are involved in various plant activities.
What is your focus on florigen? Neither I nor nachooo are making any mention of it, only that a longer dark period produces better results. You are the one bringing florigen up, we are talking about lighting schedules.
Photon Flinger
Well-Known Member
You probably shouldn't take heat sink advice from me. More cobs until you don't need no stinking heat sinks.
canadian1969
Well-Known Member
Working through some of the power supply requirements. Thoughts or suggestions anyone?
All eBay drivers
http://www.ebay.ca/itm/122480543106
280nm 4x parallel 6.5v 200ma
6W 1-2X2(3)W 600mA 2-6.8V
360nm 10x series 3.5-4v 700ma
30W 10-18X2(3)W 600mA 30-60V
660/730's 10 x series 2-2.4v 700ma (each, same type power supply)
20W 6-10X2(3)W 600mA 18-35V
Decided to go with a 4 channel Sonoff for the timing. This thing is cool, cant wait.
https://www.aliexpress.com/item/2017-Sonoff-dc220v-Wireless-Control-Wifi-Switch-Smart-Home-Automation-Intelligent-Wireless-Center-for-Light-10A/32793333869.html
Someone please review my drivers and let me know if I am on the right track.
All eBay drivers
http://www.ebay.ca/itm/122480543106
280nm 4x parallel 6.5v 200ma
6W 1-2X2(3)W 600mA 2-6.8V
360nm 10x series 3.5-4v 700ma
30W 10-18X2(3)W 600mA 30-60V
660/730's 10 x series 2-2.4v 700ma (each, same type power supply)
20W 6-10X2(3)W 600mA 18-35V
Decided to go with a 4 channel Sonoff for the timing. This thing is cool, cant wait.
https://www.aliexpress.com/item/2017-Sonoff-dc220v-Wireless-Control-Wifi-Switch-Smart-Home-Automation-Intelligent-Wireless-Center-for-Light-10A/32793333869.html
Someone please review my drivers and let me know if I am on the right track.
nachooo
Well-Known Member
You can use the 660 nm some minutes before main lights start in order to wake the plant quicker, but is not necessary at all, cause white leds has enough amount of 660 to do it also..but if you have a timer and some 660 leds... do it to experiment a little..but it wont give you a big difference.
Remember that your whole day time must include this..I mean if 12/12 the time the 660 are used must be included in the 12 hours , not added...
Danielson999
Well-Known Member
It's usually a good thing to have your drivers coming on at separate times anyway so starting the 660nm's early has an added benefit.
VegasWinner
Well-Known Member
I found these for less than $6/ea and free shipping ->http://www.ebay.com/itm/UV-LED-3W-365nm-Detect-Money-Ultraviolet-LED-5W-emitter-diode-375nm-380nm-lights/263113543532?_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20160727114228&meid=ef531cdd2f8240f5a9b18251f8f89955&pid=100290&rk=1&rkt=4&sd=263113543532&_trksid=p2060778.c100290.m3507
I plan on using a MW LDD0700 to drive them and I already have a 12v power supply
I plan on using a MW LDD0700 to drive them and I already have a 12v power supply
nachooo
Well-Known Member
I bought 4 years ago aprox my 720 nm 3 watts leds to the same seller.....
They have been done the work I used a meanwell also