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Seasonal Pathways of 14C-Photosynthate In Red Pine Labeled in May, July, and October

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The seasonal pathways of 14C-photosynthate were followed in the major organs and constituents of 4-year-old red pine seedlings labeled in May, July, and October. The distribution of 14C-labeled assimilates among plant parts was related to the intensity of tissue development in those parts at exposure time. A relatively large proportion of May-14C was channeled into the cell wall fraction of elongating shoots and needles while a large proportion of October-14C was channeled to growing roots. Individual plant organs retained a large percentage of assimilates once they obtained them. Redistribution of October-14C was more active than May-14C or July-14C since a large proportion of October-14C was fixed in reserves. Regardless of exposure date, 70 percent or more of the activity in the noncell wall fraction was in constituents other than carbohydrates, primarily lipids and nitrogenous compounds. Relative counts in the sugar fraction remained about the same for all exposures at all times of the year since sugars are probably the central metabolic pool in the redistribution of 14C. Forest Sci. 16:1-13.

Keywords: Pinus resinosa; translocation

Document Type: Journal Article

Affiliations: Associate Plant Physiologist, Forestry Sciences Laboratory, Intermountain Forest and Range Exp. Sta., Logan, Utah 84321

Publication date: 1970-03-01

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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