Abstract
The short‐term stimulation of the net rate of carbon dioxide exchange of leaves by elevated concentrations of CO 2 usually observed in C 3 plants sometimes does not persist. Experiments were conducted to test whether the patterns of response to the environment during growth were consistent with the hypotheses that photosynthetic adjustment to elevated CO 2 concentration is due to (1) feedback inhibition or (2) nutrient stress. Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4) were grown from seed at 350 and 700 μl − CO 2 , at 20 and 25°C, at a photon flux density of 0.5 and 1.0 mmol m −2 S −1 and with three nutrient regimes until the third trifoliolate leaf of soybean or the sixth leaf of sugar beet had finished expanding. Net rates of CO 2 exchange of the most recently expanded leaves were then measured at both 350 and 700 μl 1 −1 CO 2 . Plants grown at the elevated CO 2 concentration had net rates of leaf CO 2 exchange which were reduced by 33% in sugar beet and 23% in soybean when measured at 350 μl 1 −1 CO 2 and when averaged over all treatments. Negative photosynthetic adjustment to elevated CO 2 concentration was not greater at 20 than at 25°C, was not greater at a photon flux density of 1.0 than at 0.5 mmol m −2 S −1 and was not greater with limiting nutrients. Furthermore, in soybean, negative photosynthetic adjustment could be induced by a single night at elevated CO 2 concentration, with net rates of CO 2 exchange the next day equal to those of leaves of plants grown from seed at the elevated concentration of CO 2 . These patterns do not support either the feedback‐inhibition or the nutrient‐stress hypothesis of photosynthetic adjustment to elevated concentrations of CO 2 .
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Claims 7
Claim · model-written summary
Sugar beet grown at elevated CO2 had leaf net CO2 exchange reduced by 33% when measured at 350 μl/l CO2.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise1 - Material
- Mono Hye‐4e3
- Organ / stage
- most recently expanded leavese2
- Treatment
- elevated CO 2 concentratione1
- Outcome
- net rates of leaf CO 2 exchangee1
- Direction
- reducede1
- Value
- 33%e1
- Comparator
- 350 μl 1 −1 CO 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plants grown at the elevated CO 2 concentration had net rates of leaf CO 2 exchange which were reduced by 33% in sugar beet and 23% in soybean when measured at 350 μl 1 −1 CO 2”
e2“Net rates of CO 2 exchange of the most recently expanded leaves were then measured”
e3“Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)”
Claim · model-written summary
Soybean grown at elevated CO2 had leaf net CO2 exchange reduced by 23% when measured at 350 μl/l CO2.
- Taxon
- soybean
Glycine maxe1 - Material
- Williamse3
- Organ / stage
- most recently expanded leavese2
- Treatment
- elevated CO 2 concentratione1
- Outcome
- net rates of leaf CO 2 exchangee1
- Direction
- reducede1
- Value
- 23%e1
- Comparator
- 350 μl 1 −1 CO 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plants grown at the elevated CO 2 concentration had net rates of leaf CO 2 exchange which were reduced by 33% in sugar beet and 23% in soybean when measured at 350 μl 1 −1 CO 2”
e2“Net rates of CO 2 exchange of the most recently expanded leaves were then measured”
e3“Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)”
Claim · model-written summary
Negative photosynthetic adjustment to elevated CO2 was not greater at 20 than at 25 °C in soybean and sugar beet.
- Taxon
- Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)Beta vulgaris subsp. vulgarisGlycine maxe2
- Treatment
- at 20e1
- Outcome
- negative photosynthetic adjustment to elevated CO 2 concentratione1
- Direction
- not greatere1
- Comparator
- 25°Ce1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Negative photosynthetic adjustment to elevated CO 2 concentration was not greater at 20 than at 25°C, was not greater at a photon flux density of 1.0 than at 0.5 mmol m −2 S −1 and was not greater with limiting nutrients”
e2“Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)”
Claim · model-written summary
Negative photosynthetic adjustment to elevated CO2 was not greater at a photon flux density of 1.0 than at 0.5 mmol m-2 s-1 in soybean and sugar beet.
- Taxon
- Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)Beta vulgaris subsp. vulgarisGlycine maxe2
- Treatment
- a photon flux density of 1.0e1
- Outcome
- negative photosynthetic adjustment to elevated CO 2 concentratione1
- Direction
- not greatere1
- Comparator
- 0.5 mmol m −2 S −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Negative photosynthetic adjustment to elevated CO 2 concentration was not greater at 20 than at 25°C, was not greater at a photon flux density of 1.0 than at 0.5 mmol m −2 S −1 and was not greater with limiting nutrients”
e2“Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)”
Claim · model-written summary
Negative photosynthetic adjustment to elevated CO2 was not greater with limiting nutrients in soybean and sugar beet.
- Taxon
- Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)Beta vulgaris subsp. vulgarisGlycine maxe2
- Treatment
- limiting nutrientse1
- Outcome
- negative photosynthetic adjustment to elevated CO 2 concentratione1
- Direction
- not greatere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Negative photosynthetic adjustment to elevated CO 2 concentration was not greater at 20 than at 25°C, was not greater at a photon flux density of 1.0 than at 0.5 mmol m −2 S −1 and was not greater with limiting nutrients”
e2“Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)”
Claim · model-written summary
In soybean, a single night at elevated CO2 induced negative photosynthetic adjustment, with next-day net CO2 exchange equal to that of plants grown from seed at elevated CO2.
- Taxon
- soybeanGlycine maxe1
- Treatment
- a single night at elevated CO 2 concentratione1
- Outcome
- negative photosynthetic adjustmente1
- Direction
- inducede1
- Comparator
- plants grown from seed at the elevated concentration of CO 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“in soybean, negative photosynthetic adjustment could be induced by a single night at elevated CO 2 concentration, with net rates of CO 2 exchange the next day equal to those of leaves of plants grown from seed at the elevated concentration of CO 2”
Claim · model-written summary
The patterns of response do not support the feedback-inhibition or the nutrient-stress hypothesis of photosynthetic adjustment to elevated CO2.
- Taxon
- Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)Beta vulgaris subsp. vulgarisGlycine maxe2
- Outcome
- photosynthetic adjustment to elevated concentrations of CO 2e1
- Qualifier
- feedback‐inhibition or the nutrient‐stress hypothesise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“These patterns do not support either the feedback‐inhibition or the nutrient‐stress hypothesis of photosynthetic adjustment to elevated concentrations of CO 2”
e2“Soybean [ Glycine max (L.) Merr. cv. Williams] and sugar beet ( Best vulgaris L. cv. Mono Hye‐4)”
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See all 43 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.