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Fig. 3 | BMC Plant Biology

Fig. 3

From: Dynamic light caused less photosynthetic suppression, rather than more, under nitrogen deficit conditions than under sufficient nitrogen supply conditions in soybean

Fig. 3

Photosynthetic gas exchange under fluctuating light conditions. The time course of the net photosynthetic rate (Pn; a, b) under fluctuating light in the leaves of high nitrogen (HN; black) and low nitrogen (LN; grey) supply plants. The bar above the plot (a) shows the high (1600 μmol m− 2 s− 1; HL; white bar) and LL (100 μmol m− 2 s− 1; LL; grey bar) periods. The leaves were adapted under HL (1600 μmol m− 2 s− 1) for 20–40 min until the Pn stabilized, after which the leaves were exposed to fluctuating light such that the light intensity alternated between high (1600 μmol m− 2 s− 1) and low (100 μmol m− 2 s− 1) conditions every 120 s. The original Pn is shown in plot (a). In plot (b), the Pn under steady HL was taken as 100%, and the Pn under changing light conditions was calculated as a percentage of the Pn under steady HL. (b) The maximum Pn during the HL period (Pnmax) in HN- and LN-supplied plants; the Pn under steady HL was taken as 100%, and the Pnmax was calculated as a percentage of the Pn under steady HL. (c) The integrated Pn during fluctuating light in HN- and LN-supplied plants. Means ± SD, n = 6. The asterisks indicate significant differences at P < 0.05 between HN and LN leaves (T-test)

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