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  • 2 Post By Halloamey

CAM photosynthesize

This is a discussion on CAM photosynthesize within the New Growers: Ask the Senior Members forums, part of the New Growers category; so i have a question, since phals are type CAM, their growth rate are slower ...

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    Default CAM photosynthesize

    so i have a question, since phals are type CAM, their growth rate are slower because they can only photosynthesize whatever carbon storage they have on them. if day light is given 14 hours a day do they go trough photosynthesis for 14 hours or do they only go trough the process untill the carbon storage is depleted? if so.. does that mean providing 6hours of light and 6 hours or darkness kinda speed up the process of growing?

    sorry for the terrible english.. its not my 1st language but i hope its good enough to understand what im trying to ask.. lol

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    I think it means that it is more important to make sure that phals have high humidity at night, and a good solid 8 hours of darkness each night. I suspect -- but not from experience -- that lack of darkness hours would be bad for the plants in the long term.

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    so does it mean if i give 8 hours or darkness it will only have 8 hours of carbon storage for photosynthesis? just curious tho. what are they actually doing when they ran out of carbon storage for photosynthesis?

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    Hi Jennyk, What you have to understand is that CAM metabolism is not a simple linear reaction. The light phase and the dark phase are both dependent on one another for efficient functioning. The light reactions are needed for generating the reducing power (NADPH2 and NADH2) as well as ATP and Starch that are needed for the carbon fixation at night. The carbon assimilation and reducing power and ATP generation are exclusive events. So according to your scenario even when all the carbon from malate is assimilated into starch, the production of ATP and reducing power will continue. This in turn will lead to more carbon assimilation in the next night. The 6 hour day and 6 hour night will not work out since you have to consider the dynamics of protein synthesis, enzyme kinetics etc.
    The only way you can maximize growth is by providing cooler nights and higher partial CO2 pressures (higher CO2 concentration)

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    ok thank you so much for the information, yes CAM photosynthesize got me a little confuse. i guess all i can provide now is high humidity and co2 fermentation in the grow room and air circulation.. im just an impatient person again thank you!!

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