Growth in elevated CO 2 can both increase and decrease photochemistry and photoinhibition of photosynthesis in a predictable manner. Dactylis glomerata grown in two levels of nitrogen nutrition

G. J. Hymus, N. R. Baker, S. P. Long

Research output: Contribution to journalArticle

Abstract

Biochemically based models of C 3 photosynthesis can be used to predict that when photosynthesis is limited by the amount of Rubisco, increasing atmospheric CO 2 partial pressure (pCO 2 ) will increase light-saturated linear electron flow through photosystem II (J t ). This is because the stimulation of electron flow to the photosynthetic carbon reduction cycle (J c ) will be greater than the competitive suppression of electron flow to the photorespiratory carbon oxidation cycle (J o ). Where elevated pCO 2 increases J t , then the ratio of absorbed energy dissipated photochemically to that dissipated non-photochemically will rise. These predictions were tested on Dactylis glomerata grown in fully controlled environments, at either ambient (35 Pa) or elevated (65 Pa) pCO 2 , and at two levels of nitrogen nutrition. As was predicted, for D. glomerata grown in high nitrogen, J t was significantly higher in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . This was due to a significant increase in J c exceeding any suppression of J o . This increase in photochemistry at elevated pCO 2 protected against photoinhibition at high light. For plants grown at low nitrogen, J t was significantly lower in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . Elevated pCO 2 again suppressed J o ; however growth in elevated pCO 2 resulted in an acclimatory decrease in leaf Rubisco content that removed any stimulation of J c . Consistent with decreased photochemistry, for leaves grown at low nitrogen, the recovery from a 3-h photoinhibitory treatment was slower at elevated pCO 2 .

Original languageEnglish (US)
Pages (from-to)1204-1211
Number of pages8
JournalPlant physiology
Volume127
Issue number3
DOIs
StatePublished - Jan 1 2001

Fingerprint

Dactylis
Photochemistry
photochemistry
Dactylis glomerata
Photosynthesis
photoinhibition
Carbon Monoxide
Nitrogen
photosynthesis
nutrition
Ribulose-Bisphosphate Carboxylase
nitrogen
Carbon Cycle
Growth
electrons
ribulose-bisphosphate carboxylase
Electrons
Light
Controlled Environment
Photosystem II Protein Complex

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science

Cite this

@article{bd4ac233b73440d3bc9d0f6a0387ecca,
title = "Growth in elevated CO 2 can both increase and decrease photochemistry and photoinhibition of photosynthesis in a predictable manner. Dactylis glomerata grown in two levels of nitrogen nutrition",
abstract = "Biochemically based models of C 3 photosynthesis can be used to predict that when photosynthesis is limited by the amount of Rubisco, increasing atmospheric CO 2 partial pressure (pCO 2 ) will increase light-saturated linear electron flow through photosystem II (J t ). This is because the stimulation of electron flow to the photosynthetic carbon reduction cycle (J c ) will be greater than the competitive suppression of electron flow to the photorespiratory carbon oxidation cycle (J o ). Where elevated pCO 2 increases J t , then the ratio of absorbed energy dissipated photochemically to that dissipated non-photochemically will rise. These predictions were tested on Dactylis glomerata grown in fully controlled environments, at either ambient (35 Pa) or elevated (65 Pa) pCO 2 , and at two levels of nitrogen nutrition. As was predicted, for D. glomerata grown in high nitrogen, J t was significantly higher in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . This was due to a significant increase in J c exceeding any suppression of J o . This increase in photochemistry at elevated pCO 2 protected against photoinhibition at high light. For plants grown at low nitrogen, J t was significantly lower in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . Elevated pCO 2 again suppressed J o ; however growth in elevated pCO 2 resulted in an acclimatory decrease in leaf Rubisco content that removed any stimulation of J c . Consistent with decreased photochemistry, for leaves grown at low nitrogen, the recovery from a 3-h photoinhibitory treatment was slower at elevated pCO 2 .",
author = "Hymus, {G. J.} and Baker, {N. R.} and Long, {S. P.}",
year = "2001",
month = "1",
day = "1",
doi = "10.1104/pp.010248",
language = "English (US)",
volume = "127",
pages = "1204--1211",
journal = "Plant Physiology",
issn = "0032-0889",
publisher = "American Society of Plant Biologists",
number = "3",

}

TY - JOUR

T1 - Growth in elevated CO 2 can both increase and decrease photochemistry and photoinhibition of photosynthesis in a predictable manner. Dactylis glomerata grown in two levels of nitrogen nutrition

AU - Hymus, G. J.

AU - Baker, N. R.

AU - Long, S. P.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Biochemically based models of C 3 photosynthesis can be used to predict that when photosynthesis is limited by the amount of Rubisco, increasing atmospheric CO 2 partial pressure (pCO 2 ) will increase light-saturated linear electron flow through photosystem II (J t ). This is because the stimulation of electron flow to the photosynthetic carbon reduction cycle (J c ) will be greater than the competitive suppression of electron flow to the photorespiratory carbon oxidation cycle (J o ). Where elevated pCO 2 increases J t , then the ratio of absorbed energy dissipated photochemically to that dissipated non-photochemically will rise. These predictions were tested on Dactylis glomerata grown in fully controlled environments, at either ambient (35 Pa) or elevated (65 Pa) pCO 2 , and at two levels of nitrogen nutrition. As was predicted, for D. glomerata grown in high nitrogen, J t was significantly higher in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . This was due to a significant increase in J c exceeding any suppression of J o . This increase in photochemistry at elevated pCO 2 protected against photoinhibition at high light. For plants grown at low nitrogen, J t was significantly lower in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . Elevated pCO 2 again suppressed J o ; however growth in elevated pCO 2 resulted in an acclimatory decrease in leaf Rubisco content that removed any stimulation of J c . Consistent with decreased photochemistry, for leaves grown at low nitrogen, the recovery from a 3-h photoinhibitory treatment was slower at elevated pCO 2 .

AB - Biochemically based models of C 3 photosynthesis can be used to predict that when photosynthesis is limited by the amount of Rubisco, increasing atmospheric CO 2 partial pressure (pCO 2 ) will increase light-saturated linear electron flow through photosystem II (J t ). This is because the stimulation of electron flow to the photosynthetic carbon reduction cycle (J c ) will be greater than the competitive suppression of electron flow to the photorespiratory carbon oxidation cycle (J o ). Where elevated pCO 2 increases J t , then the ratio of absorbed energy dissipated photochemically to that dissipated non-photochemically will rise. These predictions were tested on Dactylis glomerata grown in fully controlled environments, at either ambient (35 Pa) or elevated (65 Pa) pCO 2 , and at two levels of nitrogen nutrition. As was predicted, for D. glomerata grown in high nitrogen, J t was significantly higher in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . This was due to a significant increase in J c exceeding any suppression of J o . This increase in photochemistry at elevated pCO 2 protected against photoinhibition at high light. For plants grown at low nitrogen, J t was significantly lower in plants grown and measured at elevated pCO 2 than for plants grown and measured at ambient pCO 2 . Elevated pCO 2 again suppressed J o ; however growth in elevated pCO 2 resulted in an acclimatory decrease in leaf Rubisco content that removed any stimulation of J c . Consistent with decreased photochemistry, for leaves grown at low nitrogen, the recovery from a 3-h photoinhibitory treatment was slower at elevated pCO 2 .

UR - http://www.scopus.com/inward/record.url?scp=0035197615&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035197615&partnerID=8YFLogxK

U2 - 10.1104/pp.010248

DO - 10.1104/pp.010248

M3 - Article

C2 - 11706199

AN - SCOPUS:0035197615

VL - 127

SP - 1204

EP - 1211

JO - Plant Physiology

JF - Plant Physiology

SN - 0032-0889

IS - 3

ER -