Table 2 Effect of Spd application on grain yield and yield components at different temperatures before heading.

From: Spermidine Enhanced Free Polyamine Levels and Expression of Polyamine Biosynthesis Enzyme Gene in Rice Spikelets under Heat Tolerance before Heading

Temperature

Spd

Grain yield

Spikelet number (panicle−1)

Sterile spikelets (%)

Partially filled grains (%)

Filled grains (%)

1000-grain weight (g)

NT

−Spd

86.8 ± 8.4 b

197.4 ± 4.8 b

14.3 ± 1.2 b

3.7 ± 0.4 a

82.0 ± 0.1 b

20.2 ± 0.1 b

 

+Spd

96.5 ± 5.9 a

207.1 ± 5.6 a

10.1 ± 1.1 c

4.3 ± 0.2 a

84.8 ± 0.1 a

20.5 ± 0.2 a

HT

−Spd

61.4 ± 5.6 d

159.4 ± 7.8 d

22.0 ± 1.9 a

3.0 ± 0.4 a

75.0 ± 2.6 c

18.6 ± 0.2 d

 

+Spd

75.1 ± 3.1 c

178.8 ± 5.2 c

13.9 ± 1.5 b

4.0 ± 0.2 a

82.1 ± 4.8 b

18.8 ± 0.1 c

  1. Means±SDs were calculated from the data of five pots. Values followed by different letters within the same column are significantly different at P < 0.05 between the different treatments, including temperature and Spd.
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