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. 2017 Mar 7;8:320. doi: 10.3389/fpls.2017.00320

Table 2.

Gas exchange and chlorophyll fluorescence parameters in female and male P. cathayana cuttings as affected by solar UV-B radiation.

Treatment Pn(μmol m−2 s−1) gs(mol m−2 s−1) Ci(μmol mol−1) E (mmol m−2 s−1) Yield qP qN Fv/Fm
MC 19.55 ± 0.42b 0.64 ± 0.04b 314.40 ± 5.10b 6.32 ± 0.05b 0.70 ± 0.01ab 0.96 ± 0.00b 0.42 ± 0.03a 0.84 ± 0.00c
FC 18.46 ± 0.61b 0.53 ± 0.03b 302.11 ± 3.13b 6.00 ± 0.08b 0.69 ± 0.03ab 0.92 ± 0.02b 0.30 ± 0.07a 0.82 ± 0.01ab
MU 17.72 ± 0.81ab 0.64 ± 0.02b 308.36 ± 1.28b 6.19 ± 0.13b 0.74 ± 0.01b 0.96 ± 0.00b 0.27 ± 0.05a 0.83 ± 0.00bc
FU 15.51 ± 0.24a 0.34 ± 0.04a 283.02 ± 7.08a 4.93 ± 0.28a 0.62 ± 0.04a 0.84 ± 0.04a 0.26 ± 0.05a 0.81 ± 0.00a
F: sex 0.000 0.012 0.182 0.002 0.010 0.000 0.230 0.000
F: uvb 0.332 0.010 0.016 0.010 0.610 0.046 0.092 0.007
F: sex × uvb 0.009 0.000 0.001 0.000 0.024 0.028 0.354 0.427

Each value is the mean ± SE (n = 5). MC, males under low UV-B radiation; MU, males under high UV-B radiation; FC, females under low UV-B radiation; FU, females under high UV-B radiation; Fsex, sex effect; F uvb, UV-B effect; Fsex×uvb, the interactive effect of sex and UV-B. Within a column, values followed by different letters are significantly different at P < 0.05 according to Tukey's test. Pn, the net photosynthesis rate; gs, stomatal conductance; Ci, intercellular CO2 concentration; E, transpiration rate; Yield, the effective quantum yield of PSII; qP, photochemical quenching coefficient; qN, non-photochemical quenching coefficient; Fv/Fm, maximum efficiency of PSII.

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