Response of photosynthetic characteristics and yield of grape to different CO₂ concentrations in a greenhouse.

Correlation of leaf photosynthetic pigment content, photosynthetic characteristics, photosynthetic CO 2 curve characteristic parameters, and related enzyme activities with fruit yield As shown in Figure 8 , the SGW of ‘Flame Seedless’ grapes showed a highly significant positive correlation with the LSP, V cmax , Pn, WUE, and RuBisCO activity ( P ≤ 0.01) and offered a significant positive correlation with Chl a content and Chl b content ( P ≤ 0.05).

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Chl a/b showed a trend of decreasing first and then increasing with the increase of CO 2 concentration 1 day, 4 days, 7 days, and 10 days after irrigation.

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