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Astrosclereids In Needles Of Old-Growth Douglas-Fir Trees

Published online by Cambridge University Press:  02 July 2020

M. Apple ,
A. Soeldner ,
R. Hamill  and
K. Tiekotfer
M. Apple
Affiliation:
Dept. of Botany and Plant Pathology, Oregon State University, Corvallis, OR97331
A. Soeldner
Affiliation:
Dept. of Botany and Plant Pathology, Oregon State University, Corvallis, OR97331
R. Hamill
Affiliation:
Dept. of Botany and Plant Pathology, Oregon State University, Corvallis, OR97331
K. Tiekotfer
Affiliation:
Legacy Holladay Park Medical Center, Portland, OR97232
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Extract

Old-growth Douglas-fir trees in the Pacific Northwest are venerable giants that often live for 500 years and reach heights of over 75 meters. Their needles are relatively ephemeral and small but have the important role of interacting with the atmosphere in order to transpire and photosynthesize. Within the photosynthetic mesophyll tissue of Douglas-fir needles, there are large, non-living cells with lignified secondary cell walls that are known as astrosclereids. Apparent channels in the secondary wall may provide a route for exchange or transport of materials between the astrosclereid lumen and mesophyll cells or the vascular cylinder. Astrosclereids may be involvev d in storage of secondary metabolites such as tannin and may develop in response to fungi, mistletoe, or other pathogens. More knowledge is needed about the development, structure and function of astrosclereids.

Needles were collected from sapling and old-growth Douglas-fir, Pseudotsuga menziesii, (Mirb.) Franco, trees at the Wind River Canopy Crane in Carson, Washington and from three sites in the Cascade Mountains of Oregon in 1997 and 1998.

Type
Highlights Of Biological Microscopy In The Pacific Northwest Usa
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 1240 - 1241
Copyright
Copyright © Microscopy Society of America

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References

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