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Table 1 Differences in the senescent-associated parameters in the flag leaves of the psf mutant and its wildtype under different N supply levels

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

Sampling stage Genotype
(G)
N Level
(N)
Chl (a)
(mg g−1 FW)
Chl (b)
(mg g−1 FW)
SPAD Pn
(μmol CO2 m−2 s−1)
Fv/Fm Fm/Fo
0 DAA Wildtype HN 4.09±0.43a 1.89±0.19a 37.76±2.30a 17.1±1.84a 0.82±0.012a 5.54±0.20a
  MN 3.82±0.22b 1.82±0.12a 35.61±3.10a 11.1±0.08b 0.71±0.10b 5.13±0.41a
  LN 2.03±0.21c 1.26±0.18b 23.44±2.37b 10.3±0.08c 0.51±0.014c 3.51±0.24b
  Means 3.45A 1.59A 32.27A 12.85A 0.68A 4.73A
psf HN 4.19±0.34a 1.50±0.12a 35.70±1.26a 11.9±0.18b 0.72±0.014a 5.01±0.21a
  MN 3.61±0.18b 1.61±0.23a 30.72±1.53b 15.3±0.10a 0.57±0.03b 3.57±1.00b
  LN 1.29±0.33c 1.00±0.22b 21.01±0.98c 9.6±0.35c 0.44±0.012c 2.33±0.27c
  Means 3.03AB 1.37A 29.14B 12.31A 0.57B 3.64B
15 DAA Wildtype HN 3.64±0.13a 1.38±0.05a 35.41±0.35a 15.4±0.33a 0.86±0.036a 4.63±0.13a
  MN 2.05±0.25b 1.09±0.10ab 32.26±0.20a 10.0±0.38b 0.64±0.031b 3.01±0.41b
  LN 1.69±0.22c 0.92±0.05b 19.83±0.30b 5.6±0.03c 0.36±0.009c 2.36±0.09c
  Means 2.469A 1.13A 29.16A 10.39A 0.62A 3.33A
psf HN 3.71±0.36a 1.13±0.12b 30.87±1.17a 8.9±1.78a 0.65±0.014a 3.83±0.11a
  MN 2.16±0.31b 1.56±0.26a 21.68±2.17b 7.5±0.82b 0.42±0.03b 2.80±0.54b
  LN 0.64±0.06c 0.50±0.11c 14.51±1.15c 3.23±0.78c 0.28±0.003c 2.02±0.03c
  Means 2.17AB 1.06A 22.35B 6.57B 0.45B 2.88AB
Harvesting Wildtype HN 2.55±0.27a 1.29±0.12a 23.82±1.36a 10.2±1.88a 0.56±0.027a 4.02±0.17a
  MN 1.81±0.06b 1.01±0.08ab 18.11±0.20b 5.0±0.69b 0.44±0.03b 2.97±0.61b
  LN 1.18±0.11c 0.86±0.11b 10.80±1.00c 1.4±0.29c 0.36±0.010c 1.5±0.01c
  Means 1.85A 1.05A 17.57A 5.57A 0.45A 2.83A
psf HN 1.31±0.58a 0.81±0.19a 20.04±3.10a 4.7±0.48a 0.39±0.016a 2.22±0.01a
  MN 1.17±0.08a 0.74±0.24a 11.01±1.02b 4.0±0.81b 0.21±0.001b 1.01±0.10b
  LN 0.25±0.12b 0.24±0.04b 8.47±1.02c 1.1±0.36c 0.17±0.005 0.72±0.05c
  Means 0.91B 0.60B 13.17B 3.30B 0.25B 1.32B
Means effect   Nitrogen * * * ** ** *
  Genotype * ns * * * *
Interaction   N*G ns ns * * * 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 nitrogen levels at the same sampling stage at p ≤ 0.05 using the 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)