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Net Assimilation Rate and Growth in Loblolly Pine Seedlings

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Loblolly pine (Pinus taeda L.) progenies from controlled crosses showed genetic variation in the seasonal pattern of net assimilation and dry weight growth. The rank of progenies in net assimilation rate (NAR) changed during the first growing season. A progeny group characterized by a high NAR shortly after germination may subsequently have a low rate in comparison with other progeny groups; i.e. the curves of NAR over time intersect. Dry matter production at 21 weeks is related to the area under the seasonal curve of NAR with a linear correlation of 0.80. This correlation relates assimilation rate and growth and indicates that both intensity anti intensity-duration aspects of photosynthesis and respiration are important to dry matter production.

Keywords: Photosynthesis; Pinus taeda L; genetic variation

Document Type: Journal Article

Affiliations: Assoc. Professor of Forest Genetics, N. C. State Univ., Raleigh

Publication date: 1969-12-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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