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Table 1 Basic chlorophyll a fluorescence (ChlF) parameters of two contrasting A. thaliana accessions, Rsch and Co, measured after 20 min of dark adaptation (DA), and immediately after 2 h of acclimation to low growth-irradiance (L50, ~50 μmol photons m−2 s−1half of the adaptive growth-irradiance”) and adaptive growth irradiance (L100, ~100 μmol photons m−2 s−1)

From: Chlorophyll a fluorescence, under half of the adaptive growth-irradiance, for high-throughput sensing of leaf-water deficit in Arabidopsis thaliana accessions

ChlF parameters

DA

L50 (50 μmol photons m−2 s−1)

L100 (100 μmol photons m−2 s−1)

Rsch

Co

Rsch

Co

Rsch

Co

F O

75 ± 4

81.5 ± 5

F S(L1)

94 ± 4

104 ± 10

100 ± 4

109 ± 10

F P

327 ± 20

355 ± 22

189 ± 22

197 ± 24

126 ± 2

144 ± 22

F S(L2)

115 ± 7

150 ± 8**

104 ± 6

126 ± 14

103 ± 4

121 ± 21

F V/F M

0.810 ± 0.003

0.803 ± 0.003

ΦPSII(L1)

0.714 ± 0.005

0.665 ± 0.008***

0.666 ± 0.004

0.610 ± 0.012**

ΦPSII(L2)

0.708 ± 0.005

0.634 ± 0.004***

0.683 ± 0.003

0.596 ± 0.010***

0.657 ± 0.006

0.570 ± 0.022**

NPQ

0.269 ± 0.001

0.244 ± 0.014**

0.251 ± 0.012

0.304 ± 0.071

0.295 ± 0.031

0.351 ± 0.082

NPQ (L)

0.105 ± 0.014

0.080 ± 0.012

0.075 ± 0.020

0.049 ± 0.013*

R FD

0.54 ± 0.01

0.74 ± 0.01***

1.33 ± 0.18

1.92 ± 0.28*

4.54 ± 0.48

6.03 ± 1.05*

  1. The parameters shown are mean ± SE (n = 4/5)
  2. Asterisks in the columns of Co for DA, for L50, and for L100 denote statistical significance of ChlF data for Rsch versus Co, respectively, measured after DA, and immediately after acclimation to 50 μmol photons m−2 s−1 (low) and 100 μmol photons m−2 s−1 (adaptive) light (* p < 0.05; ** p < 0.01; *** p < 0.001, unpaired t test)