Fig. 2

Photosynthetic light–response (a) and CO₂–response curves (b) in the leaves of hot pepper plants under different levels of irrigation water salinity (EC_iw) and leaching fractions (LF) (the measurements were made at a CO₂ concentration of 400 μmol mol⁻¹ and at a PPFD of 1200 μmol mol^− 1, respectively for light–response curves and CO₂–response curves). The three regression curves are made for the leaves of EC_iw of 0.9, 4.7 and 7 dS m^− 1, respectively, across the two LFs