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Table 1 Summary of growth-related data recorded from RAV1-engineered poplars over the course of the field trial

From: Impact of RAV1-engineering on poplar biomass production: a short-rotation coppice field trial

 

CsRAV1 OX#60

CsRAV1 OX#37

Wild-type

PtaRAV1&2 KD#22

PtaRAV1&2 KD#1

First rotation

     

 Year 2012

     

  Stem height (cm)

321.3 ± 5.0a

313.8 ± 3.7ab

318.1 ± 4.0a

295.2 ± 5.6b

313.9 ± 4.6ab

  Stem diameter (mm)

12.9 ± 0.4a

12.8 ± 0.3a

11.9 ± 0.3ab

10.7 ± 0.4b

11.8 ± 0.3ab

  Stem volume (cm3)

413.5 ± 26.2ns

381.7 ± 20.3ns

376.1 ± 25.4ns

317.4 ± 24.4ns

383.5 ± 25.2ns

  Basal area (cm2)

3.8 ± 0.2ns

3.6 ± 0.2ns

3.5 ± 0.2ns

3.1 ± 0.2ns

3.6 ± 0.2ns

 Year 2013

     

  Stem height (cm)

506.8 ± 11.1ns

484.8 ± 9.2ns

498.8 ± 12.7ns

496.1 ± 11.5ns

475.7 ± 15.4ns

  Stem diameter (mm)

24.8 ± 0.6a

23.1 ± 0.5ab

23.3 ± 0.6ab

22.4 ± 0.6ab

21.5 ± 0.8b

  Stem volume (cm3)

2090.3 ± 111.2ns

1747.1 ± 120.1ns

1855.7 ± 129.2ns

1790.9 ± 118.6ns

1589.7 ± 123.8ns

  Basal area (cm2)

12.2 ± 0.5a

10.6 ± 0.6ab

10.9 ± 0.6ab

10.7 ± 0.6ab

9.7 ± 0.6b

Second rotation

     

 Year 2014

     

  Dominant shoot height (cm)

537.9 ± 11.9bc

515.6 ± 11.5b

602.3 ± 10.1a

565.4 ± 9.8ac

574.8 ± 9.1ac

  Dominant shoot diameter (mm)

21.1 ± 0.9a

20.6 ± 0.8a

26.7 ± 0.8b

24.6 ± 1.0b

26.4 ± 0.8b

  Dominant shoot volume (cm3)

1713.7 ± 155.8ns

1515.6 ± 138.6ns

2444.5 ± 170.1ns

1936.1 ± 131.5ns

2274.6 ± 146.6ns

  Basal area (cm2)

82.7 ± 9.2ns

88.4 ± 12.4ns

92.7 ± 12.6ns

104.9 ± 15.8ns

94.1 ± 10.7ns

 Year 2015

     

  Dominant shoot height (cm)

704.1 ± 20.0a

679.5 ± 20.5a

793.5 ± 16.9b

728.2 ± 21.0ab

779.7 ± 15.5b

  Dominant shoot diameter (mm)

31.2 ± 1.3a

30.0 ± 1.2a

36.6 ± 1.3b

33.3 ± 1.3ab

35.9 ± 1.0b

  Dominant shoot volume (cm3)

3818.1 ± 389.6ns

3291.2 ± 303.9ns

4809.4 ± 402.4ns

3972.7 ± 359.9ns

4736.5 ± 319.0ns

  Basal area (cm2)

124.9 ± 26.0ns

106.8 ± 13.8ns

109.5 ± 15.3ns

119.2 ± 16.8ns

108.1 ± 12.1ns

  1. Average values for heights and diameters of the main stem and the dominant shoot, and for biomass yield estimators volumes and basal areas ± SE (CsRAV1 OX#60 n = 30, CsRAV1 OX#37 n = 30, WT n = 29, PtaRAV1&2 KD#22 n = 30, PtaRAV1&2 KD#1 n = 30) of wild-type (WT) and CsRAV1-overexpression and PtaRAV1&2-knockdown transgenics measurements were made at the end of every year. Letters a, b, and c represent significant differences between genotypes (p < 0.05)
  2. ns no significance