Effects of elevated CO2 on photosynthesis, growth and reproduction of branches of the tropical canopy species, Luehea seemannii Tr. & Planch.

Lovelock, C. E., Virgo, A., Popp, M. and Winter, K. (1999) Effects of elevated CO2 on photosynthesis, growth and reproduction of branches of the tropical canopy species, Luehea seemannii Tr. & Planch.. Plant Cell and Environment, 22 1: 49-59. doi:10.1046/j.1365-3040.1999.00370.x


Author Lovelock, C. E.
Virgo, A.
Popp, M.
Winter, K.
Title Effects of elevated CO2 on photosynthesis, growth and reproduction of branches of the tropical canopy species, Luehea seemannii Tr. & Planch.
Formatted title
Effects of elevated CO2 on photosynthesis, growth and reproduction of branches of the tropical canopy species, Luehea seemannii Tr. & Planch.
Journal name Plant Cell and Environment   Check publisher's open access policy
ISSN 1365-3040
0140-7791
Publication date 1999-01-01
Year available 1999
Sub-type Article (original research)
DOI 10.1046/j.1365-3040.1999.00370.x
Open Access Status Not yet assessed
Volume 22
Issue 1
Start page 49
End page 59
Total pages 11
Place of publication West Sussex, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract Mature trees have already experienced substantial increases in CO2 concentrations during their lifetimes, and will experience continuing increases in the future. Small open-top chambers were used to enclose branchlets that were at a height of between 20 and 25 m in the canopy of the tree species Luehea seemannii Tr. & Planch. in a tropical forest in Panama. Elevated concentrations of CO2 increased the rate of photosynthetic carbon fixation and decreased stomatal conductance of leaves, but did not influence the growth of leaf area per chamber, the production of flower buds and fruit nor the concentration of nonstructural carbohydrates within leaves. The production of flower buds was highly correlated with the leaf area produced in the second flush of leaves, indicating that the branchlets of mature trees of Luehea seemannii are autonomous to a considerable extent. Elevated levels of CO2 did increase the concentration of nonstructural carbohydrates in woody stem tissue. Elevated CO2 concentration also they increased the ratio of leaf area to total biomass of branchlets, and tended to reduce individual fruit weight. These data suggest that the biomass allocation patterns of mature trees may change under future elevated levels of CO2. Although there were no effects on growth during the experiment, the possibility of increased growth in the season following CO2 enrichment due to increased carbohydrate concentrations in woody tissue cannot be excluded.
Formatted abstract
 Mature trees have already experienced substantial increases in CO2 concentrations during their lifetimes, and will experience continuing increases in the future. Small open-top chambers were used to enclose branchlets that were at a height of between 20 and 25 m in the canopy of the tree species Luehea seemannii Tr. & Planch. in a tropical forest in Panamá. Elevated concentrations of CO2 increased the rate of photosynthetic carbon fixation and decreased stomatal conductance of leaves, but did not influence the growth of leaf area per chamber, the production of flower buds and fruit nor the concentration of nonstructural carbohydrates within leaves. The production of flower buds was highly correlated with the leaf area produced in the second flush of leaves, indicating that the branchlets of mature trees of Luehea seemannii are autonomous to a considerable extent. Elevated levels of CO2 did increase the concentration of nonstructural carbohydrates in woody stem tissue. Elevated CO2 concentration also they increased the ratio of leaf area to total biomass of branchlets, and tended to reduce individual fruit weight. These data suggest that the biomass allocation patterns of mature trees may change under future elevated levels of CO2. Although there were no effects on growth during the experiment, the possibility of increased growth in the season following CO2 enrichment due to increased carbohydrate concentrations in woody tissue cannot be excluded.
Keyword Plant Sciences
Plant Sciences
PLANT SCIENCES
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Fri, 16 May 2014, 04:53:09 EST by Professor Catherine Lovelock on behalf of School of Biological Sciences