Fig. 6
From: Acclimation with humic acids enhances maize and tomato tolerance to salinity
Photosynthetic characterization of tomato plants. Data were obtained in 5-week-old plants with either control (1/2 strength Hoagland solution) or humic acids (control + 4 mM C HA) further treated for additional 7 days with 200 mM NaCl, 4 mM C HA or 200 mM NaCl plus 4 mM C HA. Values are presented as means ± SD (n = 10). Different letters represent average values that were judged to be statistically different between 7-day treated plants (P < 0.05, Tukey test). A Net of photosynthesis rate; B stomatal conductance; C transpiration rate; D quantum production yield; F total chlorophyll a content; G total chlorophyll b content; H total carotenoids content