Fig. 1

Leaves of tobacco seedlings without (a and c) or with (b and d) exogenous trehalose under control (a and b) or nitrogen deficient (c and d) conditions. Chlorophyll content (e) and photosynthesis rate (f) of the youngest fully expanded leaf. Pictures and data were obtained from seedlings (45 days old) after treatment for 15 days as indicated except (d). Values represent the mean ± SE of 5 individual plants. Within each set of experiments, the different letters indicate significant differences (P < 0.05)