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Table 3 Difference in antioxidants enzyme activities in the flag leaves of psf mutant and its wildtype under different nitrogen supplies during grain filling

From: Nitrogen deficiency regulates premature senescence by modulating flag leaf function, ROS homeostasis, and intercellular sugar concentration in rice during grain filling

DAA Genotype N level SOD activity
(U mg−1 FW)
POD
(U mg−1 FW)
CAT
(μmol min−1 mg−1 FW)
APX
(μmol min−1 mg−1 FW)
0 WT HN 177.09±2.17a 23.20±1.94b 223.01±4.83a 36.95±2.30a
  MN 170.34±5.12b 31.34±5.06a 221.72±13.41b 38.01±5.00a
  LN 98.68±3.80c 33.64±1.71a 181.05±5.98c 28.35±1.07b
  Means 148.70B 29.39B 208.59A 34.44A
psf HN 277.83±3.72a 24.43±1.17c 251.83±3.29a 31.80±2.59a
  MN 210.08±10.22b 33.26±4.98b 244.21±10.23b 30.75±3.15a
  LN 88.96±5.24c 36.19±0.39a 103.54±2.39c 21.00±1.99b
  Means 192.29A 31.29A 199.86B 27.85B
15 WT HN 127.63±13.18a 35.44±3.06c 274.92±12.30a 25.58±1.42a
  MN 105.74±5.87b 38.17±2.41b 181.00±6.89b 20.12±4.08b
  LN 53.43±3.11c 41.12±1.18a 138.18±14.14c 14.52±2.87c
  Means 95.60A 38.24B 198.03A 20.07A
psf HN 106.18±10.76a 43.92±2.97c 188.83±10.62a 21.21±0.46a
  MN 71.63±4.98b 49.00±5.01b 124.37±9.81b 18.04±2.05b
  LN 37.04±1.59c 54.45±2.22a 84.27±4.19c 11.32±1.17c
  Means 71.62B 49.12A 132.49B 16.86B
30 WT HN 85.62±8.84a 40.99±3.12c 202.56±15.79a 13.62±1.39a
  MN 51.62±3.21b 46.21±3.14b 155.28±11.37b 10.23±1.25b
  LN 28.24±1.74c 50.10±1.74c 82.09±13.78c 9.58±1.01c
  Means 55.16A 45.77B 146.64A 11.14A
psf HN 53.48±4.06a 54.70±1.21c 91.13±16.00a 10.71±0.12a
  MN 30.02±6.14b 63.10±8.14b 72.51±6.77b 7.82±1.22b
  LN 21.81±2.01c 72.26±0.85a 21.72±7.22c 5.61±0.81c
  Means 35.10B 63.35A 61.79B 8.05AB
Means effect   Nitrogen ** ** ** *
  Genotype ** * * *
Interaction   N*G * * * ns
  1. Different letters within the columns indicate a significant difference between nitrogen treatments for a genotype and mean values indicate a significant difference between the genotypes under all the treatments at p ≤ 0.05 level least significant difference (LSD)
  2. DAA days after anthesis, HN high N, MN medium N, LN low N
  3. ** and * indicate the significance at the 0.01 and 0.05 level, respectively; NS means no significant difference based on the analysis of variance. Data are presented as means ± SD (n=3)