A meta-analysis of elevated [CO2] effects on soybean (Glycine max) physiology, growth and yield

Elizabeth Ainsworth, Phillip A. Davey, Carl Bernacchi, Orla C. Dermody, Emily A. Heaton, David J. Moore, Patrick B. Morgan, Shawna L. Naidu, Hyung Shim Yoo Ra, Xin Guang Zhu, Peter S. Curtis, Stephen P Long

Research output: Contribution to journalArticle

Abstract

The effects of elevated [CO2] on 25 variables describing soybean physiology, growth and yield are reviewed using meta-analytic techniques. This is the first meta-analysis to our knowledge performed on a single crop species and summarizes the effects of 111 studies. These primary studies include numerous soybean growth forms, various stress and experimental treatments, and a range of elevated [CO2] levels (from 450 to 1250 p.p.m.), with a mean of 689 p.p.m. across all studies. Stimulation of soybean leaf CO2 assimilation rate with growth at elevated [CO2] was 39%, despite a 40% decrease in stomatal conductance and a 11% decrease in Rubisco activity. Increased leaf CO2 uptake combined with an 18% stimulation in leaf area to provide a 59% increase in canopy photosynthetic rate. The increase in total dry weight was lower at 37%, and seed yield still lower at 24%. This shows that even in an agronomic species selected for maximum investment in seed, several plant level feedbacks prevent additional investment in reproduction, such that yield fails to reflect fully the increase in whole plant carbon uptake. Large soil containers (> 9 L) have been considered adequate for assessing plant responses to elevated [CO2]. However, in open-top chamber experiments, soybeans grown in large pots showed a significant threefold smaller stimulation in yield than soybeans grown in the ground. This suggests that conclusions about plant yield based on pot studies, even when using very large containers, are a poor reflection of performance in the absence of any physical restriction on root growth. This review supports a number of current paradigms of plant responses to elevated [CO2]. Namely, stimulation of photosynthesis is greater in plants that fix N and have additional carbohydrate sinks in nodules. This supports the notion that photosynthetic capacity decreases when plants are N-limited, but not when plants have adequate N and sink strength. The root: shoot ratio did not change with growth at elevated [CO2], sustaining the charge that biomass allocation is unaffected by growth at elevated [CO2] when plant size and ontogeny are considered.

Original languageEnglish (US)
Pages (from-to)695-709
Number of pages15
JournalGlobal change biology
Volume8
Issue number8
DOIs
StatePublished - Aug 15 2002

Fingerprint

Physiology
meta-analysis
Glycine
physiology
soybean
Containers
Seed
Ribulose-Bisphosphate Carboxylase
Photosynthesis
Crops
seed
effect
Biomass
open-top chamber
Carbon
root-shoot ratio
biomass allocation
Carbohydrates
growth form
stomatal conductance

Keywords

  • Atmospheric change
  • Global change
  • Global food security
  • Harvest index
  • Photosynthesis

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • Environmental Science(all)

Cite this

A meta-analysis of elevated [CO2] effects on soybean (Glycine max) physiology, growth and yield. / Ainsworth, Elizabeth; Davey, Phillip A.; Bernacchi, Carl; Dermody, Orla C.; Heaton, Emily A.; Moore, David J.; Morgan, Patrick B.; Naidu, Shawna L.; Ra, Hyung Shim Yoo; Zhu, Xin Guang; Curtis, Peter S.; Long, Stephen P.

In: Global change biology, Vol. 8, No. 8, 15.08.2002, p. 695-709.

Research output: Contribution to journalArticle

Ainsworth, E, Davey, PA, Bernacchi, C, Dermody, OC, Heaton, EA, Moore, DJ, Morgan, PB, Naidu, SL, Ra, HSY, Zhu, XG, Curtis, PS & Long, SP 2002, 'A meta-analysis of elevated [CO2] effects on soybean (Glycine max) physiology, growth and yield', Global change biology, vol. 8, no. 8, pp. 695-709. https://doi.org/10.1046/j.1365-2486.2002.00498.x
Ainsworth, Elizabeth ; Davey, Phillip A. ; Bernacchi, Carl ; Dermody, Orla C. ; Heaton, Emily A. ; Moore, David J. ; Morgan, Patrick B. ; Naidu, Shawna L. ; Ra, Hyung Shim Yoo ; Zhu, Xin Guang ; Curtis, Peter S. ; Long, Stephen P. / A meta-analysis of elevated [CO2] effects on soybean (Glycine max) physiology, growth and yield. In: Global change biology. 2002 ; Vol. 8, No. 8. pp. 695-709.
@article{b90c6c7a17314b5ab88f5ab488b20ea5,
title = "A meta-analysis of elevated [CO2] effects on soybean (Glycine max) physiology, growth and yield",
abstract = "The effects of elevated [CO2] on 25 variables describing soybean physiology, growth and yield are reviewed using meta-analytic techniques. This is the first meta-analysis to our knowledge performed on a single crop species and summarizes the effects of 111 studies. These primary studies include numerous soybean growth forms, various stress and experimental treatments, and a range of elevated [CO2] levels (from 450 to 1250 p.p.m.), with a mean of 689 p.p.m. across all studies. Stimulation of soybean leaf CO2 assimilation rate with growth at elevated [CO2] was 39{\%}, despite a 40{\%} decrease in stomatal conductance and a 11{\%} decrease in Rubisco activity. Increased leaf CO2 uptake combined with an 18{\%} stimulation in leaf area to provide a 59{\%} increase in canopy photosynthetic rate. The increase in total dry weight was lower at 37{\%}, and seed yield still lower at 24{\%}. This shows that even in an agronomic species selected for maximum investment in seed, several plant level feedbacks prevent additional investment in reproduction, such that yield fails to reflect fully the increase in whole plant carbon uptake. Large soil containers (> 9 L) have been considered adequate for assessing plant responses to elevated [CO2]. However, in open-top chamber experiments, soybeans grown in large pots showed a significant threefold smaller stimulation in yield than soybeans grown in the ground. This suggests that conclusions about plant yield based on pot studies, even when using very large containers, are a poor reflection of performance in the absence of any physical restriction on root growth. This review supports a number of current paradigms of plant responses to elevated [CO2]. Namely, stimulation of photosynthesis is greater in plants that fix N and have additional carbohydrate sinks in nodules. This supports the notion that photosynthetic capacity decreases when plants are N-limited, but not when plants have adequate N and sink strength. The root: shoot ratio did not change with growth at elevated [CO2], sustaining the charge that biomass allocation is unaffected by growth at elevated [CO2] when plant size and ontogeny are considered.",
keywords = "Atmospheric change, Global change, Global food security, Harvest index, Photosynthesis",
author = "Elizabeth Ainsworth and Davey, {Phillip A.} and Carl Bernacchi and Dermody, {Orla C.} and Heaton, {Emily A.} and Moore, {David J.} and Morgan, {Patrick B.} and Naidu, {Shawna L.} and Ra, {Hyung Shim Yoo} and Zhu, {Xin Guang} and Curtis, {Peter S.} and Long, {Stephen P}",
year = "2002",
month = "8",
day = "15",
doi = "10.1046/j.1365-2486.2002.00498.x",
language = "English (US)",
volume = "8",
pages = "695--709",
journal = "Global Change Biology",
issn = "1354-1013",
publisher = "Wiley-Blackwell",
number = "8",

}

TY - JOUR

T1 - A meta-analysis of elevated [CO2] effects on soybean (Glycine max) physiology, growth and yield

AU - Ainsworth, Elizabeth

AU - Davey, Phillip A.

AU - Bernacchi, Carl

AU - Dermody, Orla C.

AU - Heaton, Emily A.

AU - Moore, David J.

AU - Morgan, Patrick B.

AU - Naidu, Shawna L.

AU - Ra, Hyung Shim Yoo

AU - Zhu, Xin Guang

AU - Curtis, Peter S.

AU - Long, Stephen P

PY - 2002/8/15

Y1 - 2002/8/15

N2 - The effects of elevated [CO2] on 25 variables describing soybean physiology, growth and yield are reviewed using meta-analytic techniques. This is the first meta-analysis to our knowledge performed on a single crop species and summarizes the effects of 111 studies. These primary studies include numerous soybean growth forms, various stress and experimental treatments, and a range of elevated [CO2] levels (from 450 to 1250 p.p.m.), with a mean of 689 p.p.m. across all studies. Stimulation of soybean leaf CO2 assimilation rate with growth at elevated [CO2] was 39%, despite a 40% decrease in stomatal conductance and a 11% decrease in Rubisco activity. Increased leaf CO2 uptake combined with an 18% stimulation in leaf area to provide a 59% increase in canopy photosynthetic rate. The increase in total dry weight was lower at 37%, and seed yield still lower at 24%. This shows that even in an agronomic species selected for maximum investment in seed, several plant level feedbacks prevent additional investment in reproduction, such that yield fails to reflect fully the increase in whole plant carbon uptake. Large soil containers (> 9 L) have been considered adequate for assessing plant responses to elevated [CO2]. However, in open-top chamber experiments, soybeans grown in large pots showed a significant threefold smaller stimulation in yield than soybeans grown in the ground. This suggests that conclusions about plant yield based on pot studies, even when using very large containers, are a poor reflection of performance in the absence of any physical restriction on root growth. This review supports a number of current paradigms of plant responses to elevated [CO2]. Namely, stimulation of photosynthesis is greater in plants that fix N and have additional carbohydrate sinks in nodules. This supports the notion that photosynthetic capacity decreases when plants are N-limited, but not when plants have adequate N and sink strength. The root: shoot ratio did not change with growth at elevated [CO2], sustaining the charge that biomass allocation is unaffected by growth at elevated [CO2] when plant size and ontogeny are considered.

AB - The effects of elevated [CO2] on 25 variables describing soybean physiology, growth and yield are reviewed using meta-analytic techniques. This is the first meta-analysis to our knowledge performed on a single crop species and summarizes the effects of 111 studies. These primary studies include numerous soybean growth forms, various stress and experimental treatments, and a range of elevated [CO2] levels (from 450 to 1250 p.p.m.), with a mean of 689 p.p.m. across all studies. Stimulation of soybean leaf CO2 assimilation rate with growth at elevated [CO2] was 39%, despite a 40% decrease in stomatal conductance and a 11% decrease in Rubisco activity. Increased leaf CO2 uptake combined with an 18% stimulation in leaf area to provide a 59% increase in canopy photosynthetic rate. The increase in total dry weight was lower at 37%, and seed yield still lower at 24%. This shows that even in an agronomic species selected for maximum investment in seed, several plant level feedbacks prevent additional investment in reproduction, such that yield fails to reflect fully the increase in whole plant carbon uptake. Large soil containers (> 9 L) have been considered adequate for assessing plant responses to elevated [CO2]. However, in open-top chamber experiments, soybeans grown in large pots showed a significant threefold smaller stimulation in yield than soybeans grown in the ground. This suggests that conclusions about plant yield based on pot studies, even when using very large containers, are a poor reflection of performance in the absence of any physical restriction on root growth. This review supports a number of current paradigms of plant responses to elevated [CO2]. Namely, stimulation of photosynthesis is greater in plants that fix N and have additional carbohydrate sinks in nodules. This supports the notion that photosynthetic capacity decreases when plants are N-limited, but not when plants have adequate N and sink strength. The root: shoot ratio did not change with growth at elevated [CO2], sustaining the charge that biomass allocation is unaffected by growth at elevated [CO2] when plant size and ontogeny are considered.

KW - Atmospheric change

KW - Global change

KW - Global food security

KW - Harvest index

KW - Photosynthesis

UR - http://www.scopus.com/inward/record.url?scp=0036327020&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036327020&partnerID=8YFLogxK

U2 - 10.1046/j.1365-2486.2002.00498.x

DO - 10.1046/j.1365-2486.2002.00498.x

M3 - Article

AN - SCOPUS:0036327020

VL - 8

SP - 695

EP - 709

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 8

ER -