Abstract
Summary Continuous daily measurements of CO 2 -evolution were carried out separately for shoots and roots of intact Scots pine seedlings grown in a water culture under laboratory control!ed conditions, during the first vegetation season. The rates of root respiration at constant temperature during the night were lower than those during the day when plants were photosynthesizing. The obtained results were used for further estimation of growth (constructive)- and maintenance-respiratory coefficients. Both maintenance and growth respiration were greater in the roots than in the shoot.
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