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Examination of the relationship between photosynthesis and growth of a dominant white oak (Quercus alba L.) tree has shown that most growth processes were either completed or well underway before the establishment of significant positive rates of net photosynthesis. Growth was initiated first in the root system (March 3), followed by stem cambial growth (March 26) and later by flower, leaf, and branch growth (April 10). During the period of rapid leaf and branch growth, root and cambial growth ceased and then resumed as the leaves approached maturity. The rapid rate of leaf maturation, the early appearance of positive rates of net photosynthesis in leaves (15% of final size) and the CO(2)-refixing capability of elongating branch tissue reduced the period of time that this white oak tree was dependent on stored reserves. Lower temperature optima and compensation points in developing leaves and stems indicated that the growth-temperature response was optimized for the lower seasonal temperatures observed during the spring. This temperature adaptation further reduced the time that this tree was dependent on stored reserves.

Net Photosynthesis and Early Growth Trends of a Dominant White Oak (Quercus alba L.)