Abstract
Dry matter, leaf area production and daily CO 2 exchanges were measured on Chenopodium polyspermum, a preferential short-day plant, grown under short- or long-day conditions. Rates of respiration were always greater in short-day conditions, but the plant modified its carbon balance in such a way that, except during the induction period, the relationship between daily CO 2 input and daily CO 2 output remained the same. A different shape in night respiration was found according to the photoperiod. Short-day plants exhibited an increase of CO 2 output at the end of the night period, the maximum of which depended of the previous photoperiodic regime. In long-day plants, respiration decreased continuously during the night. The dependence of these results on an endogenous rhythm and on tropic supplies is discussed.
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