Pacific Southwest

Title: Maintenance and constructive respiration, photosynthesis, and net assimilation rate in seedlings of pitch pine (Pinus rigida Mill.)

Author: Ledig, F. Thomas; Drew, A.P.; Clark, J.G.

Date: 1976

Source: Ann. Botany 40(166):289-300

Description: Pitch pine seedlins were grown at constant temperature and photoperiod. Net CO₂-uptake h^-1 g^-1 leaves decreased stadily during ontogeny until leaf production ceased. Thereafter, there was no change or a slight increase. Though the 0ntogeneic pattern was the same in populations native to different geographic areas, there were differences among populations in the rate of CO₂-uptake. Root respiration, calculated from the difference between CO₂-uptake and net assimilation rate, accounted for 6 to 69 per cent of diurnal assimilation.

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Citation

Ledig, F. Thomas; Drew, A.P.; Clark, J.G.  1976.  Maintenance and constructive respiration, photosynthesis, and net assimilation rate in seedlings of pitch pine (Pinus rigida Mill.).   Ann. Botany 40(166):289-300.