@article {Shepard:1975-12-01T00:00:00:0015-749X:370, author =
"Shepard, Robert K.", title = "Notes: Radial Distribution of
Corticular Photosynthate in Stems of Bigtooth and Trembling
Aspen", journal = "Forest Science", volume = "21", number = "4",
year = "1975-12-01T00:00:00", abstract = "Stem sections of two
bigtooth aspen and two trembling aspen were exposed to 14CO2.
Relatively large amounts of radioactivity (14C-labeled alcohol-
soluble compounds) were later detected in the cortex and cambial
region of both species. Lesser amounts of activity were found in
xylem and phloem; the smallest amount in the nonconducting
phloem. These results indicate that photosynthate produced in
the cortex is available for use by the cambium and that some is
likely stored in xylem and phloem parenchyma as well as in
cortical parenchyma. Forest Sci. 21:370-372.", pages =
"370-372", url = "http://www.ingentaconnect.com/content/saf/fs/1
975/00000021/00000004/art00009", keyword = "Populus
grandidentata, Populus tremuloides, cortex,