2024-09-26 PL-INT-2024-008813 GP 2045 Draft Comments - A. Longo

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Impact of elevated [CO2]on cucurbitaceous crops Cucumber is the most studied fruit crop of the cucurbitaceae in relation to growth in carbon-enriched atmospheres(Figure z;Table 4).Improved carbon assimilation rates of up to 99%and 112%have been reported for cucumber and melon respectively when grown in e[CO2][66,67], demonstrating that growth in e[CO2]improves photosynthesis of cucurbitaceous crops. Impact of elevated atmospheric[CO2]on yield and nutritional quality of Cucurbitaceous crops Table 4 Impact of elevated atmospheric[CO2]on yield and nutritional quality of Cucurbitaceous crops Crop CO2Treatment Additional Fruit Yield Fruit Quality Ref Treatment(s) Cucumber 400 ppm, 2 mmol L-1 Up to 73%increase in fresh fruit yield for 75%increase in fruit fructose,73%increase in glucose at [66 625 ppm, 7 mmol L-1 plants grown at highest[CO2]versus plants 7 mmol L-1 at highest[CO2].No significant change in fruit ] - 1200 ppm 14 mmol r 1 NO3 grown at lowest[CO2]at greatest N titratable acidity.e[CO2]reduced dietary fibre by 13%-18% [68 fertilisation.No significant difference in across all fertilisation treatments.Up to 84%reduction in ] yield for lower N fertilisation. fruit nitrogenous compounds in e[CO2]across all nitrogen treatments. 400 ppm, 0.06 g N kg 1 soil 31%-37%increase in fresh fruit yield for Across both nitrogen treatments at[CO2]=1200 ppm,fruit [70 800 ppm, (low N), [CO2[=800 ppm and 1200 ppm at low N. fructose was increased by 5%-6%,fruit glucose was ] 1200 ppm 0.24 g N kg-1 soil 71%-106%increase in fresh fruit yield for increased by 10%-12%and starch was increased by 29%- (high N) [CO2]=800 ppm and 1200 ppm at high N 40%. 364 ppm, N/A Up to 10.2%increase in individual fruit No significant change in fruit dry matter content [45 620 ppm weight for August production in e[CO2] ] 400-500 ppm N/A 19%increase in fresh fruit yield at e[CO2] N/A [17 5] 600-700 ppm N/A 20%increase in fresh fruit yield at e[CO2] N/A [17 6] 700 ppm N/A 14.2%-18.4%increase in fresh fruit yield at Overall reduction in fruit inorganic nutrients(N,P,K,Ca,Mg). [71 e[CO2]across two crop cycles. ] 780 ppm N/A 35%increase in fresh fruit yield in N/A [17 greenhouse supplemented with[CO2] 7] versus control greenhouse. 700 ppm- N/A 20%-30%increase in marketable fruit N/A [15 1000 ppm yield across two growing seasons. 8] 900-1000 ppm 0.6°C-1.8% 35.4%increase in dry fruit mass in cooled N/A [17 cooling and e[CO2]conditions 8] 1000 ppm N/A 8.9%increase in fruit weight but no N/A [17 significant change in fruit number at e[CO2] 9] 900 ppm, N/A 18.4%-26.3%increase in fresh fruit yield N/A [61 1500 ppm, across all CO2 elevations. ] 3000 ppm Melon 400 ppm, 0,25,50 mmol NaCI Up to 29%increase in fruit yield in all N/A [67 800 ppm, e[CO2]at no additional salinity.Elevated ] 1200 ppm [CO2]partially rescues yield loss from salinity(by up to 18%)but is insufficient to fully mitigate yield loss. 1000 ppm N/A 13%increase in muskmelon fruit number N/A [16 and 8%increase in muskmelon fruit weight 9] during summer production under e[CO2] Squash 700-1000 ppm N/A 15.5%-19.7%increase in total marketable N/A [15 yield across 2 growing seasons. 8] In cucumber(Cucumis sativus),fruit yield increases for plants grown in enriched-carbon atmospheres([CO2]=45o ppm-300o ppm)ranged between 16.2%and 41%in the absence of other parameters that could alter fruit yield.In high nitrogen supplemented fertilisation,fruit yield was as high as 106%when grown under e[CO2]of 80o ppm[68],indicating the potential of increased nitrogen fertilisation alongside[CO2]enrichment to unlock the greatest yield increases in cucumber.Interestingly,when grown under e[CO2]of 1200 ppm with the addition of high nitrogen PDF fertilisation treatment,studies found a yield increase between 71%-73%[66,68],which was lower than the 106%for plants grown at e[CO2]of 80o ppm.Concentrations of[CO2]above optimal reduced stomatal density,stomatal conductance(gs),the maximum carboxylation rate(Vcmax) HeiA"' .. .. ... . . - - .. .. _ - .._ .. . .. .. . .. . _ ... .. a - • . Oxford University Press uses cookies to enhance your experience on our website.By selecting`accept all'you are agreeing to our use of cookies.You can change your cookie setting More information can be found in our Cookie Policy.