Abstract
Acclimation of photosynthesis and growth at three CO2 concentrations (376, 652 and 935 μmol mol-1) was examined in cotton grown under three growth-limiting phosphate (P) supplies (2.1, 6.1 and 18.2 mg P plant-1) and where biomass allocation between roots and shoots was altered by pots of three different sizes (0.32 × 10-3, 0.72 × 10-3 and 1.56 × 10-3 m3 pot-1). Phosphate supplies were chosen such that carbon gain at ambient CO2 increased linearly with P supply. Relative growth rates of these plants were 5-10-times less and photosynthetic rates 3-16-times less than for cotton supplied with abundant nutrients. Pot sizes were chosen so that root biomass and root:shoot ratios decreased with a decrease in rooting volume. Maximum carboxylation rates per unit leaf area (Vcmax) were lower in leaves grown at two elevated CO2 concentrations, compared with ambient CO2 concentrations, under all P and pot size treatments indicating that acclimation of photosynthesis had occurred. The degree of photosynthetic acclimation to elevated CO2 was not related to the degree by which whole plant carbon gain was stimulated by elevated CO2 concentration at the different P supplies, or to the degree by which allocation to root and shoots was altered by pot size. Thus there is no simple relationship between photosynthetic and growth acclimation by cotton to elevated CO2. At ambient CO2, the maximum carboxylation rate increased linearly with an increase in leaf P per unit area (mg P m-2), but rates were lower at elevated CO2 for a given P content m-2. Vcmax also increased linearly with an increase in leaf P concentration (mg P g-1 structural dry weight). However, values of Vcmax were similar for plants grown at ambient and elevated CO2, for a given P concentration. Acclimation of photosynthesis at elevated CO2 was associated with an increase in leaf starch determined 5 h into the light period. However, increased starch concentration with an increase in P supply was not associated with any decline in Vcmax.
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Claims 14
Claim · model-written summary
At ambient CO2, carbon gain increased linearly with phosphate supply.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- P supplye0
- Outcome
- carbon gaine0
- Direction
- increased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carbon gain at ambient CO2 increased linearly with P supply.”
t0“Cotton”
Claim · model-written summary
Growth rates under limiting phosphate were 5-10 times less than with abundant nutrients.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- growth-limiting phosphate (P) suppliese1
- Outcome
- Relative growth ratese0
- Direction
- lesse0
- Value
- 5-10-timese0
- Comparator
- abundant nutrientse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative growth rates of these plants were 5-10-times less and photosynthetic rates 3-16-times less than for cotton supplied with abundant nutrients.”
e1“grown under three growth-limiting phosphate (P) supplies”
Claim · model-written summary
Photosynthetic rates under limiting phosphate were 3-16 times less than with abundant nutrients.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- growth-limiting phosphate (P) suppliese1
- Outcome
- photosynthetic ratese0
- Direction
- lesse0
- Value
- 3-16-timese0
- Comparator
- abundant nutrientse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative growth rates of these plants were 5-10-times less and photosynthetic rates 3-16-times less than for cotton supplied with abundant nutrients.”
e1“grown under three growth-limiting phosphate (P) supplies”
Claim · model-written summary
Root biomass decreased with reduced rooting volume.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- decrease in rooting volumee0
- Outcome
- root biomasse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root biomass and root:shoot ratios decreased with a decrease in rooting volume.”
t0“Cotton”
Claim · model-written summary
Root:shoot ratios decreased with reduced rooting volume.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- decrease in rooting volumee0
- Outcome
- root:shoot ratiose0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root biomass and root:shoot ratios decreased with a decrease in rooting volume.”
t0“Cotton”
Claim · model-written summary
Leaf Vcmax was lower at elevated than ambient CO2 across phosphate and pot treatments.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- two elevated CO2 concentrationse0
- Outcome
- Maximum carboxylation rates per unit leaf area (Vcmax)e0
- Direction
- lowere0
- Comparator
- ambient CO2 concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum carboxylation rates per unit leaf area (Vcmax) were lower in leaves grown at two elevated CO2 concentrations, compared with ambient CO2 concentrations, under all P and pot size treatments”
t0“Cotton”
Claim · model-written summary
Photosynthetic acclimation was unrelated to elevated CO2 stimulation of whole-plant carbon gain.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- elevated CO2e0
- Outcome
- degree of photosynthetic acclimatione0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of photosynthetic acclimation to elevated CO2 was not related to the degree by which whole plant carbon gain was stimulated by elevated CO2 concentration at the different P supplies”
t0“Cotton”
Claim · model-written summary
Photosynthetic acclimation was unrelated to pot-size-induced allocation changes.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- pot sizee0
- Outcome
- degree of photosynthetic acclimatione0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of photosynthetic acclimation to elevated CO2 was not related to the degree by which whole plant carbon gain was stimulated by elevated CO2 concentration at the different P supplies, or to the degree by which allocation to root and shoots was altered by pot size.”
t0“Cotton”
Claim · model-written summary
At ambient CO2, Vcmax increased linearly with leaf P per area.
- Taxon
- CottonGossypium hirsutumt0
- Organ / stage
- leafe0
- Treatment
- ambient CO2e0
- Outcome
- maximum carboxylation ratee0
- Direction
- increased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At ambient CO2, the maximum carboxylation rate increased linearly with an increase in leaf P per unit area (mg P m-2)”
t0“Cotton”
Claim · model-written summary
At a given P per area, Vcmax was lower at elevated CO2.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- elevated CO2e0
- Outcome
- ratese0
- Direction
- lowere0
- Qualifier
- for a given P content m-2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rates were lower at elevated CO2 for a given P content m-2.”
t0“Cotton”
Claim · model-written summary
Vcmax increased linearly with leaf P concentration.
- Taxon
- CottonGossypium hirsutumt0
- Organ / stage
- leafe0
- Outcome
- Vcmaxe0
- Direction
- increased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vcmax also increased linearly with an increase in leaf P concentration (mg P g-1 structural dry weight).”
t0“Cotton”
Claim · model-written summary
At a given P concentration, Vcmax was similar under ambient and elevated CO2.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- elevated CO2e0
- Outcome
- values of Vcmaxe0
- Direction
- similare0
- Comparator
- ambiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“values of Vcmax were similar for plants grown at ambient and elevated CO2, for a given P concentration.”
t0“Cotton”
Claim · model-written summary
Elevated CO2 photosynthetic acclimation was associated with greater leaf starch.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- elevated CO2e0
- Outcome
- leaf starche0
- Direction
- increasee0
- Qualifier
- 5 h into the light periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation of photosynthesis at elevated CO2 was associated with an increase in leaf starch determined 5 h into the light period.”
t0“Cotton”
Claim · model-written summary
Starch increase with P supply was not associated with Vcmax decline.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- increase in P supplye0
- Outcome
- Vcmaxe0
- Direction
- not associatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased starch concentration with an increase in P supply was not associated with any decline in Vcmax.”
t0“Cotton”
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See all 36 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.