Nighttime starch degradation, the circadian clock, and plant growth

Stradel said:

Omg

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earthwyrms said:

ok, i realize it wasn't that.

the link the person posted on the water cress/Arabidopsis thaliana

http://www.jstor.org/stable/1514476?seq=1#page_scan_tab_contents

says in the abstract
>"Using this new system we demonstrated that, under continuous light, there was a longer circadian period for both stomatal conductance and CO2 fixation in the zietlupe (ztl-1) mutant compared to wild type."
>"Wild-type ZTL expression is therefore required for normal cycles of CO@ fixation and stomatal conductance. Furthermore, we demonstrate that different circadian periods can coexist in a single plant, highlighting the cell autonomous nature of the plant circadian oscillator"

what i looked through so far is also not about cannabis specifically.

http://link.springer.com/article/10.1007/BF00194433
about Phaseolus vulgaris L/common bean

"
Abstract

Persistent circadian rhythms in photosynthesis and stomatal opening occurred in bean (Phaseolus vulgaris L.) plants transferred from a natural photoperiod to a variety of constant conditions. Photosynthesis, measured as carbon assimilation, and stomatal opening, as conductance to water vapor, oscillated with a freerunning period close to 24 h under constant moderate light, as well as under light-limiting and CO2-limiting conditions. The rhythms damped under constant conditions conducive to high photosynthetic rates, as did rates of carbon assimilation and stomatal conductance, and this damping correlated with the accumulation of carbohydrate. No rhythm in respiration occurred in plants transferred to constant darkness, and the rhythm in stomatal opening damped rapidly in constant darkness. Damping of rhythms also occurred in leaflets exposed to constant light and CO2-free air, demonstrating that active photosynthesis and not simply light was necessary for sustained expression of these rhythms.
" "This is CIWDPB Publication No. 1142

This research was supported by National Science Foundation grant BSR 8717422 (C.B.F.) and a U.S. Department of Agriculture training grant to Stanford University (T.L.H.)." "Article

Planta

March 1993, Volume 189, Issue 3, pp 369-376" <<< and still costs money, "

$39.95 / €34.95 / £29.95 *
"
^^^^it says "The rhythms damped under constant conditions conducive to high photosynthetic rates, as did rates of carbon assimilation and stomatal conductance, and this damping correlated with the accumulation of carbohydrate"
and when they removed the CO2 from otherwise good conditions, the damping of cycles occured. it doesn't say what damping is.

http://www.plantphysiol.org/content/96/3/831.abstract

about Phaseolus vulgaris L/common bean (says here red kidney bean)

"
Abstract

Net carbon assimilation and stomatal conductance to water vapor oscillated repeatedly in red kidney bean, Phaseolus vulgaris L., plants transferred from a natural photoperiod to constant light. In a gas exchange system with automatic regulation of selected environmental and physiological variables, assimilation and conductance oscillated with a free-running period of approximately 24.5 hours. The rhythms in carbon assimilation and stomatal conductance were closely coupled and persisted for more than a week under constant conditions. A rhythm in assimilation occurred when either ambient or intercellular CO2 partial pressure was held constant, demonstrating that the rhythm in assimilation was not entirely the result of stomatal effects on CO2 diffusion. Rhythms in assimilation and conductance were not expressed in plants grown under constant light at a constant temperature, demonstrating that the rhythms did not occur spontaneously but were induced by an external stimulus. In plants grown under constant light with a temperature cycle, a rhythm was entrained in stomatal conductance but not in carbon assimilation, indicating that the oscillators driving the rhythms differed in their sensitivity to environmental stimuli.
" <<<this one is free for view/download on the pdf
these parts
>>"The rhythms damped under constant conditions conducive to high photosynthetic rates, as did rates of carbon assimilation and stomatal conductance, and this damping correlated with the accumulation of carbohydrate."
>>"Rhythms in assimilation and conductance were not expressed in plants grown under constant light at a constant temperature, demonstrating that the rhythms did not occur spontaneously but were induced by an external stimulus."
>>>>>"In plants grown under constant light with a temperature cycle, a rhythm was entrained in stomatal conductance but not in carbon assimilation, indicating that the oscillators driving the rhythms differed in their sensitivity to environmental stimuli."

it seems the temperature changes did something

the poster also listed this one http://www.plantphysiol.org/content/102/3/859.full.pdf which is extensive and i did not read yet.

i stumbled on to this page http://www.mrnice.nl/forum/6-breeders-support-information/5340-c3-c4-photosynthesis.html

when i was stumbled on Carbon fixation types from the link of the poster http://web.archive.org/web/20030306020209/http://www.geocities.com/CapeCanaveral/Hall/2385/rate.htm
where it says "Oxygen
Oxygen competes with carbon dioxide for the active site of RuBP carboxylase, the carbon dioxide fixing enzyme. This means that relatively high concentrations of oxygen, for example the 21% in our atmosphere, inhibit photosynthesis. Oxygen does not inhibit carbon dioxide fixation in the C4 plants. "

it doesn't have any sources besides "Created by Nicola Kerrison" and i don't know where it is from and i searched to see if cannabis is C4 and saw that page after being confused because i saw some places it was said to be C3, no where that seemed to be a good source. and when i skimmed "C3 carbon fixation" on wikipedia
https://en.wikipedia.org/wiki/C3_carbon_fixation

i read "C3 plants cannot grow in hot areas because RuBisCO incorporates more oxygen into RuBP as temperatures increase. This leads to photorespiration, which leads to a net loss of carbon and nitrogen from the plant and can, therefore, limit growth. In dry areas, C3 plants shut their stomata to reduce water loss, but this stops CO2 from entering the leaves and, therefore, reduces the concentration of CO2 in the leaves. This lowers the CO2:O2 ratio and, therefore, also increases photorespiration. C4 and CAM plants have adaptations that allow them to survive in hot and dry areas, and they can, therefore, out-compete C3 plants."

and i thought it didn't make sense if cannabis is in the hot tropical regions
so i haven't read through http://www.mrnice.nl/forum/6-breeders-support-information/5340-c3-c4-photosynthesis.html yet and hope to








the posters R043 pointed me towards,

secondtry

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then the quote from last last post

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the infrared light thing may do something as that was 2010 and now there are 730nm in full spectrum LEDs

Blckbrd wrote

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ShroomDr had posted right before Blckbrd

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and last and not least, actually first breakthrough on the thread posted by LJB

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i hope that helps getting it concentrated
thanks

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