Claim · model-written summary
CO2 above 46 mmol m−3 gave no further growth benefit at moderate PPF.
- Taxon
- lettuce
Lactuca sativae2 - Treatment
- Elevating CO2 above 46 mmol m-3e0
- Outcome
- benefite0
- Direction
- no further benefite0
Not reportedComparator
Verbatim
e0“Elevating CO2 above 46 mmol m-3 at moderate PPF had no further benefit.”
e1“Elevating CO2 above 46 mmol m-3 at moderate PPF had no further benefit.”
t0“Effects of CO2and Photosynthetic Photon Flux on Yield, Gas Exchange and Growth Rate ofLactuca SativaL. ‘Waldmann’s Green”
e2“Enrichment of CO2 to 46 mmol m-3 (1000 mm3 dm-3) at a moderate photosynthetic photon flux (PPF) of 450 micromoles m-2 s-1 stimulated fresh and dry weight gain of lettuce leaves 39% to 75% relative to plants at 16 mmol m-3 CO2 (350 mm3 dm-3).”
e3“high PPF of 880-900 micromoles m-2 s-1 gave further, substantial increases in growth, RGR, net assimilation rate (NAR) and photosynthetic rate (Pn), but a decrease in leaf area ratio (LAR), at 46 or 69 mmol m-3 (1000 or 1500 mm3 dm-3) CO2”
e4“Enrichment of CO2 to a supraoptimal level of 92 mmol m-3 (2000 mm3 dm-3) at high PPF increased leaf area and LAR”
Title
SHARON L. KNIGHT; CARY A. MITCHELL Journal of Experimental Botany 1988. doi:10.1093/jxb/39.3.317
Other claims from this paper (9)
- Intervention effect CO2 enrichment increased lettuce leaf fresh weight gain by 39–75% at moderate PPF.
- Intervention effect CO2 enrichment increased lettuce leaf dry weight gain by 39–75% at moderate PPF.
- Observation Relative growth rate increased only in the first days of exponential growth.
- Intervention effect High PPF increased growth, RGR and NAR at 46 or 69 mmol m−3 CO2.
- Intervention effect High PPF increased photosynthetic rate at enriched CO2.
- Intervention effect High PPF decreased leaf area ratio.
- Intervention effect At high PPF, supraoptimal CO2 increased leaf area and LAR.
- Intervention effect Supraoptimal CO2 decreased specific leaf weight, NAR and Pn.
- Intervention effect Supraoptimal CO2 had no effect on organ dry weights or RGR compared with 69 mmol m−3 CO2.