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Seasonal non-structural carbohydrate dynamics differ between twig bark and xylem tissues

Journal Article · · Trees
 [1];  [2];  [3];  [3]
  1. Northeast Forestry Univ., Harbin (China); University of Georgia - Savannah River Ecology Laboratory
  2. Univ. of Georgia, Aiken, SC (United States); Univ. of Georgia, Athens, GA (United States)
  3. Northeast Forestry Univ., Harbin (China)
Despite extensive research non-structural carbohydrate (NSC), the distribution of total NSC (TNC) and its primary components (sugar and starch) to the bark and xylem of twigs remains poorly understood. We determined seasonal NSC dynamics in twig bark and xylem in seven temperate tree species exhibiting different xylem anatomies and leaf habits. Seasonal trends in sugar were similar across species with concentrations peaking at least 15 days earlier in the spring for xylem than bark. Furthermore, evergreens exhibited maximum bark starch concentrations in early spring, followed by declines throughout the growing season, whereas deciduous species exhibited early spring declines in bark starch, followed by late growing season increases. Evergreens exhibited limited seasonal variation in xylem starch concentrations, whereas deciduous species exhibited variation in xylem starch concentrations that was similar to variation in bark starch. With a few exceptions, concentrations and seasonal amplitudes for sugar, starch, and TNC were generally higher in bark than xylem. Sugar concentrations were generally higher than starch, especially in the bark, which resulted in variability of TNC concentrations in bark or xylem. NSC concentrations varied significantly between xylem and the entire twig when bark was not explicitly considered. Averaged across species, sugar, starch, and TNC content in bark accounted for 66%, 54%, and 61% of total twig content, respectively, even though bark only accounted for 53% of the total twig mass. We recommend quantifying bark sugar and starch separately from xylem when determining twig NSC concentration and content.
Research Organization:
Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Lab. (SREL)
Sponsoring Organization:
Fundamental Research Funds for the Central Universities; USDA National Institute of Food and Agriculture through McIntire Stennis project; USDOE
Grant/Contract Number:
EM0005228
OSTI ID:
1909987
Journal Information:
Trees, Journal Name: Trees Journal Issue: 4 Vol. 36; ISSN 0931-1890
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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