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Fig. 4 | BMC Plant Biology

Fig. 4

From: Physiological analysis and transcriptome sequencing reveal the effects of combined cold and drought on tomato leaf

Fig. 4

a The Fv/Fm (maximum potential quantum efficiency of PSII), (b) Fq/Fm (quantum yield of PSII), (c) qL (fraction of open PSII centers), (d) NPQ (non-photochemical quenching) and (e) rapid light-response curves of ETR (electron transport rate) in leaves of tomato after 42 h exposure to control, cold, drought and combined stress conditions. The Fq/Fm, qL and NPQ were measured at a PPFD of 285 μmol m− 2 s− 1, which was close to the growth PPFD of 300 μmol m− 2 s− 1. The data represents mean values ± SD (n = 4). Different letters indicate significant difference at P < 0.05. For ETR, the different letters were marked for light levels of 190, 285, 420, 630 and 822 μmol m− 2 s− 1

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