Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE (Open Access)

Re-analysis of plant CO2 responses during the exponential growth phase: interactions with light, temperature, nutrients and water availability

Miko U. F. Kirschbaum A C and Suzanne M. Lambie B
+ Author Affiliations
- Author Affiliations

A Landcare Research, Private Bag 11 052, Palmerston North 4442, New Zealand.

B Landcare Research, Private Bag 3127, Hamilton 3240, New Zealand.

C Corresponding author. Email: kirschbaumm@landcareresearch.co.nz

Functional Plant Biology 42(10) 989-1000 https://doi.org/10.1071/FP15103
Submitted: 23 April 2015  Accepted: 1 July 2015   Published: 19 August 2015

Abstract

Many short-term experiments have been conducted under increasing CO2 but results have been varied and have not yet led to a conclusive quantitative understanding of the CO2 response of plant growth. This may have been partly due to a lack of explicit consideration of the positive feedback inherent in plant growth during periods of exponential growth. This feedback can increase an initial physiological enhancement of relative growth rate (RGR) into a much larger biomass enhancement. To overcome this problem, we re-analysed existing experimental data from 78 publications. We calculated the RGRs of C3 plants and their relative enhancement under elevated CO2 and derived response indices that were independent of the duration of experiments and the RGR at normal atmospheric CO2. The RGR of unstressed plants increased by 14 ± 2% under doubled CO2, with observed RGR enhancement linearly correlated with calculated photosynthetic enhancements (based on the Farquhar-von Caemmerer-Berry photosynthesis model), but at only half their numeric values. Calculated RGR enhancements did not change significantly for temperatures from 12 to 40°C, but were reduced under nutrient limitation, and were increased under water stress or low irradiance. We concluded that short-term experiments can offer simple and cost-effective insights into plant CO2 responses, provided they are analysed by calculating relative changes in RGR during the strictly exponential initial growth phase.

Additional keywords: nutrient limitation, photosynthesis, PAR, photosynthetically active radiation, relative growth rate, RGR, water limitation.


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