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Seasonal and daily variations in total chlorophyll (Chltot, (a)), the ratio of Chla to Chlb (Chla/Chlb, (b)) and total carotenoids (Cartot, (c)) in the leaves of P. latifolia. Leaves were sampled at 08:00–09:00 (8 h in the graphs), 12:00–13:00 (12 h), 14:30–15:30 (15 h) and 17:30–18:30 (18 h) hours at two dates in spring (11–12 and 25–26 May, blue lines) and summer (4–5 and 22–23 July, red dashed lines) on clear days. Data are reported as means ± SD ( n= 6).
