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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