Fig. 4.
Frequency distribution of different accessions according to the relationships between PSII efficiency (ΦPSII) under non-photorespiratory conditions in response to 50 (A), 100 (B), and 200 µM ABA (C) relative to no ABA (ΦPSII ABA/ ΦPSII C) after 4 d exposure of plants to moderate VPD (1.17 kPa; black bars) or to low VPD (0.23 kPa; grey bars).