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

Tom Ledig; A.P. Drew; J.G. Clark

doi:10.1093/oxfordjournals.aob.a085130

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

Informally Refereed

Authors:

Tom Ledig, A.P. Drew, J.G. Clark

Year:

1976

Type:

Miscellaneous Publication

Station:

Pacific Southwest Research Station

DOI:

https://doi.org/10.1093/oxfordjournals.aob.a085130

Source:

Ann. Botany 40(166):289-300

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Abstract

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.

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