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    Author(s): F. Thomas Ledig; A.P. Drew; J.G. Clark
    Date: 1976
    Source: Ann. Botany 40(166):289-300
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (1.0 MB)


    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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    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

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