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Table 2 The net photosynthesis rate (Pn) of uppermost or flag leaves with a portable photosynthesis system LI-6400XT, the photosynthetic photon flux density (PPFD) were 1000 μmol m− 2 s− 1 at different growth stages for cv. YLY1 and LYP9. The p values are probability of two-tail t-test. n = 10, Pn (μmol m− 2 s− 1) (mean ± SD). TS means tillering stage, PDS means panicle differentiation stage, HFS means heading and flowering stage, MS means milk stage of grain filling, DS means dough stage of grain filling

From: Architectural and Physiological Features to Gain High Yield in an Elite Rice Line YLY1

Year   TS PDS HFS MS DS
2011 YLY1 / / 23.84 ± 1.16 20.00 ± 1.07 14.77 ± 2.05
LYP9 / / 20.98 ± 1.06 20.09 ± 1.40 14.98 ± 2.09
Difference / / 13.63% −0.45% −1.40%
p / / < 0.01 0.819 0.757
2012 YLY1 23.24 ± 0.59 25.58 ± 1.36 20.22 ± 0.15 20.10 ± 1.21 15.75 ± 1.11
LYP9 24.05 ± 0.48 21.31 ± 1.47 18.16 ± 1.66 17.27 ± 0.03 14.27 ± 1.16
Difference −3.37% 20.04% 11.34% 16.39% 10.37%
  p < 0.01 < 0.01 < 0.01 < 0.01 < 0.01
2013 YLY1 26.70 ± 0.53 25.08 ± 0.19 23.88 ± 0.25 21.39 ± 0.19 16.95 ± 0.24
LYP9 25.00 ± 0.49 22.61 ± 0.33 23.79 ± 0.26 20.15 ± 0.18 16.49 ± 0.30
Difference 6.80% 10.90% 0.41% 6.13% 2.81%
  p < 0.01 < 0.01 0.7967 < 0.01 0.2472
2014 YLY1 28.43 ± 0.51 26.98 ± 0.35 25.04 ± 0.73 21.51 ± 0.37 17.71 ± 0.87
LYP9 27.75 ± 0.38 25.32 ± 0.65 24.77 ± 0.81 20.36 ± 0.55 15.98 ± 0.47
Difference 2.43% 6.56% 1.09% 5.65% 10.84%
  p < 0.05 < 0.01 0.6608 < 0.05 < 0.05