Claim · model-written summary
Relative growth rate increased only in the first days of exponential growth.
- Taxon
- lettuce
Lactuca sativae2 - Outcome
- Relative growth rate (RGR)e0
- Direction
- stimulatede0
- Qualifier
- only during the first several days of exponential growthe0
Verbatim
e0“Relative growth rate (RGR) was stimulated only during the first several days of exponential growth.”
e1“Relative growth rate (RGR) was stimulated only during the first several days of exponential growth.”
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.
- Intervention effect CO2 above 46 mmol m−3 gave no further growth benefit at moderate PPF.
- 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.