CO2 effects on apical dominance in Pisum sativum

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Abstract
Alaska pea plants (Pisum sativum L.) were grown at 0.10 vol% and 0.035 vol% CO2 to determine the effects of high CO2 concentration upon plant growth and apical dominance. The results showed that a 0.10 vol% CO2 atmosphere significantly increased the rate of lateral branch, flower bud, flower and fruit development over an environment with 0.035 vol% CO2. At plant maturity, however, there were no significant differences in the number of branches or fruits produced at the different CO2 levels. Thus, no evidence was obtained for the loss of apical dominance at the CO2 concentrations tested. Root dry weight was significantly greater in plants grown at 0.10 vol% CO2 than in those grown at 0.035 vol% CO2 and leaf dry weight was significantly lower. However, no significant differences were found in total plant dry weight production at plant maturity.