Figure 4.

Heterologous expression of AtBBX21 increases photosynthesis in potato plants. A, Chlorophyll levels of nontransformed (Spunta) and transgenic (CH1, CH2, and CH13) potato leaves (n = 10). B, Photosynthesis, transpiration rate, stomatal conductance, and internal concentration of CO₂ as a function of PPFD (n = 4). C, WUE as function of PPFD (n = 4). D, StRCA, StLHCB, and StFTSZ1 transcript levels (n = 4). n = number of biological replicates. Mean values are shown with error bars indicating se. Data were analyzed by Student’s t tests, and asterisks indicate significant difference between nontransformed and transgenic lines (*P < 0.05, **P < 0.01, and ***P < 0.001; NS, not significant).