Figure 2. Relationship between net photosynthesis and photosynthetic photon flux density (PPFD) for mite-infested (+M) and control (–M) leaves of cotton plants grown in pots in the field. Effect of mite treatment for each PPFD level is ns = not significant; ** P < 0.01; *** P < 0.001. Boxes show parameters (mean ± SE) of the light-response curve (Eq. [1]), i.e., light-saturated photosynthesis (P_max, µmol CO₂ m^–2 s^–1), respiration (R, µmol CO₂ m^–2 s^–1), and a fitted parameter of curvature [b, (µmol m^–2 s^–1) ^–1]. DAS, days after sowing.