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Tissue chemistry and carbon allocation in seedlings of Pinus palustris subjected to elevated atmospheric CO2 and water stress

Runion, G.B. and Entry, J.A. and Prior, S.A. and Mitchell, R.J. and Rogers, H.H. (1999) Tissue chemistry and carbon allocation in seedlings of Pinus palustris subjected to elevated atmospheric CO2 and water stress. Tree Physiology. 19:329-335.

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Abstract

Longleaf pine (Pinus palustris Mill.) seedlings
were grown in 45-1 pots and exposed to ambient or elevated
(365 or 730 uamol CO2 mol-1 ) CO2 concentration in open-top
chambers for 20 months. Two water-stress treatments (target
values of -0.5 or -1.5 MPa xylem pressure potential) were
imposed 19 weeks after initiation of the study. At harvest,
tissues (needles, stems, taproots, coarse roots, and fine roots)
were analyzed for carbon (C), nitrogen (N), nonpolar extractives
(fats, waxes, and oils), nonstructural carbohydrates (sugars
and starch), structural components (cellulose and lignin),
and tannins. The greatest dry weights and lowest N concentrations
occurred in tissues of plants grown at elevated CO 2 or
with adequate water.
Although allocation of C fractions among tissues was generally
unaffected by treatments, concentrations of the analyzed
compounds were influenced by treatments in needles and
taproots, but not in stems and lateral roots. Needles and taproots
of plants exposed to elevated CO2 had increased concentrations
of nonstructural carbohydrates. Among plant tissues,
elevated CO2 caused reductions in structural C concentrations
and foliar concentrations of fats, waxes and oils.

Item Type: Article
NWISRL Publication Number: 0987
Subjects: Mass Import - unclassified
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:54
Last Modified: 17 Nov 2016 15:54
Item ID: 713
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/713