https://www.sciencedaily.com/releases/2012/05/120521132758.htm

it's because of CO2 solubility in water, i'm almost certain, and this is why CO2 enrichment makes a big difference in width and shortness of space between sidebranches

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i have a firm grounding in chemistry and solubility of gases in liquids gets higher at low temperatures so low light causes elongation but low temperature increases relative CO2 absorption

Thank you for the discovery journey. I’ll share what I find. Now I’m curious, as we have had this CO2 discussion under a different topic in the past.