Table 3 The chlorophyll fluorescence parameters of lettuce leaves exposed to different L/D cycle treatments of RB.

From: Responses of butter leaf lettuce to mixed red and blue light with extended light/dark cycle period

Treatment

Fv/Fm

Vj

Ψo

RC/CS

PIabs

L16/D8

0.88a

0.47b

0.53b

131.48bc

2.83b

L24/D12

0.86a

0.44c

0.56a

141.21b

2.96a

L48/D24

0.87a

0.48b

0.52b

144.47b

2.83b

L96/D48

0.87a

0.52a

0.48c

111.71c

2.03c

L120/D60

0.87a

0.50a

0.50c

170.30a

2.80b

  1. Values for the same parameter with different letters significantly differ at the 5% level (by Tukey’s test, n = 3).
  2. Fv/Fm—the maximum photochemical efficiency of PSII under dark adaptation; Vj—relative variable fluorescence of J point; Ψo—probability of the trapped exciton transferring electrons to other electron acceptors downstream of QA- in the electron transfer chain; RC/CS—the density of active reaction centers per unit area; PIabs—the performance index based on absorbed optical energy.
  3. L/D—light/dark. L16/D8—16 h light/8 h dark, L24/D12—24 h light/12 h dark, L48/D24—48 h light/24 h dark, L96/D48—96 h light/48 h dark, L120/D60—120 h light/60 h dark.
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