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Effects of different levels of alkaline stress with and without seed-priming with silicon (Si) on the contents of (A) chlorophyll a, (B) chlorophyll b and (C) carotenoids in leaves of 25-day-old maize plants. Bars represent standard deviation (SD) of the means (n = 3). Different letters indicate significant differences among the treatments at P < 0.05, according to Duncan’s multiple range test. FW, fresh weight.
