Photosynthetic pigments in the needles of seedlings obtained from the seven <i>P</i>. <i>abies</i> populations, after 6-week treatments with the indicated NaCl concentrations.

<p>Variation in (a) total carotenoids, (b) chlorophyll a and (c) chlorophyll b. Means with SD (n = 3). For each population, different lowercase letters above the bars indicate significant differences among treatments and different capital letters indicate significant differences among populations undergoing the same treatment, according to the Tukey test (α = 0.05).