Table 4 Effect of BR application on chlorophyll fluorescence parameters in leaves of two foxtail millet cultivars under Sigma Broad treatment.

From: Spraying Brassinolide improves Sigma Broad tolerance in foxtail millet (Setaria italica L.) through modulation of antioxidant activity and photosynthetic capacity

cultivars

time

treatment

Y (II)

ETR (II)

Y (NO)

Y (NPQ)

Fv/Fm

Y(I)

ETR(I)

Y(ND)

Y(NA)

Pm

Jingu 21

7 DAT

Control (Water)

0.080 a

33.7 a

0.345 a

0.574 a

0.694 a

0.189 a

79.2 a

0.718 a

0.094 a

0.508 a

Sigma Broad

0.067 b

28.2 b

0.372 a

0.561 a

0.665 a

0.159 a

66.8 a

0.756 a

0.085 a

0.386 a

BR + Sigma Broad

0.073 ab

30.7 ab

0.346 a

0.581 a

0.673 a

0.173 a

72.8 a

0.751 a

0.076 a

0.396 a

15 DAT

Control (Water)

0.088 a

37.0 a

0.312 a

0.600 a

0.728 a

0.192 a

80.5 a

0.754 a

0.055 a

0.514 a

Sigma Broad

0.052 b

22.0 c

0.310 a

0.637 a

0.718 a

0.107 c

44.9 c

0.812 a

0.081 a

0.390 b

BR + Sigma Broad

0.071 a

30.0 b

0.281 a

0.648 a

0.726 a

0.145 b

60.9 b

0.827 a

0.028 a

0.436 ab

Zhangza 5

7 DAT

Control (Water)

0.084 a

35.4 a

0.333 a

0.583 a

0.725 a

0.193 a

81.0 a

0.739 a

0.068 a

0.520 a

Sigma Broad

0.064 b

27.0 b

0.321 a

0.616 a

0.661 a

0.156 b

65.8 b

0.775 a

0.069 a

0.315 b

BR + Sigma Broad

0.074 ab

31.3 ab

0.351 a

0.575 a

0.681 a

0.185 a

77.7 a

0.725 a

0.090 a

0.416 ab

15 DAT

Control (Water)

0.116 a

48.6 a

0.287 a

0.598 a

0.742 a

0.243 a

102.2 a

0.712 a

0.058 a

0.452 a

Sigma Broad

0.058 c

24.6 c

0.302 a

0.640 a

0.711 b

0.143 b

60.0 b

0.745 a

0.113 a

0.415 a

BR + Sigma Broad

0.090 b

38.1 b

0.304 a

0.606 a

0.723 ab

0.199 ab

83.5 ab

0.772 a

0.035 a

0.440 a

  1. Data are the mean ± standard error (n = 3). Duncan’s multiple range test at 5% probability level was used to compare the mean values of the treatment effects in each cultivar. Same letters after data indicate non-significant differences between treatments (P < 0.05).
  2. Y (II) PS II effective quantum yield, ETR (II) PSII electron transport rate, Y (NO) quantum yield of non-regulated energy dissipation in PSII, Y (NPQ) quantum yield of regulated energy dissipation in PSII, Fv/Fm PSII maximum quantum yield, Y(I) PSI photochemical quantum yield, ETR(I) PSI electron transport rate, Y(ND) quantum yield of non-photochemical energy dissipation due to donor side limitation in PSI, Y(NA) quantum yield of nonphotochemical energy dissipation due to accepter side limitation in PSI, Pm maximal P700 change.
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