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Assimilation, Stomatal Conductance, Specific Leaf Area and Chlorophyll Responses to Elevated CO2 of Maranthes corymbosa, a Tropical Monsoon Rain Forest Species

Eamus, Derek, Berryman, Chrissie Annette and Duff, Gordon A. (1993). Assimilation, Stomatal Conductance, Specific Leaf Area and Chlorophyll Responses to Elevated CO2 of Maranthes corymbosa, a Tropical Monsoon Rain Forest Species. Australian Journal of Plant Physiology,20(6):741-755.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 34 times in Scopus Article | Citations

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Title Assimilation, Stomatal Conductance, Specific Leaf Area and Chlorophyll Responses to Elevated CO2 of Maranthes corymbosa, a Tropical Monsoon Rain Forest Species
Author Eamus, Derek
Berryman, Chrissie Annette
Duff, Gordon A.
Journal Name Australian Journal of Plant Physiology
Publication Date 1993
Volume Number 20
Issue Number 6
ISSN 0310-7841   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0027130345
Start Page 741
End Page 755
Total Pages 15
Place of Publication Australia
Publisher C S I R O Publishing
Field of Research 270000 Biological Sciences
Abstract Seeds of Maranthes corymbosa Blume, a monsoon rain forest species of northern Australia, were sown under ambient or elevated CO2 concentrations in tropical Australia. Seedlings were grown under conditions of photon flux density, temperature and atmospheric vapour pressure deficit which followed ambient variations as closely as possible. Specific leaf area, chlorophyll, stomatal density, stomatal conductance and assimilation responses to photon flux density were measured after 30 weeks growth. Gas exchange characteristics were divided into morning and afternoon data sets and analysed separately. Stomatal density decreased and leaf area:dry weight ratio decreased in response to elevated CO2. In contrast there was no effect of elevated CO2 upon chlorophyll (total or ratio of a:b). Apparent quantum yield and rates of light saturated assimilation (Amax) increased in response to elevated CO2. There was a significant decline in apparent quantum yield for both treatments between morning and afternoon. Stomatal conductance (gs) declined in response to elevated CO2. There was no significant difference in gs between morning and afternoon for ambient grown trees, but gs declined significantly between morning and afternoon for elevated CO2 grown trees. Instantaneous transpiration efficiency (ITE) was higher for elevated CO2 grown trees compared with control trees. There was a significant increase in ITE between morning and afternoon data for ambient grown trees; in contrast a significant decline in ITE was observed for elevated CO2 grown trees between morning anf afternoon data sets. The slope of the regression between assimilation rate and stomatal conductance increased for plants grown under elevated CO2. These data are discussed and compared with the responses of plants adapting to different photon flux densities.
DOI http://dx.doi.org/10.1071/PP9930741   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Fri, 29 Aug 2014, 20:24:44 CST by Anthony Hornby