Table I.

Phenotypic characteristics of soil-grown transgenic tobacco plants expressing either a GA20-oxidase (AtGA20-ox) or a GA2-oxidase (AtGA2-ox) from Arabidopsis

Wild TypeAtGA20-oxAtGA2-ox
GA20-7GA20-10GA20-15GA2-2GA2-32GA2-41
Stem height (cm)68.6 ± 9.988.2 ± 6.786.8 ± 12.5107.6 ± 7.811.6 ± 0.611.8 ± 0.211.3 ± 1.3
Number of leaves22.8 ± 0.424.5 ± 0.524.2 ± 0.724.3 ± 1.024.4 ± 0.823.2 ± 1.222.2 ± 1.2
Leaf thickness (mm)0.23 ± 0.020.19 ± 0.020.19 ± 0.020.19 ± 0.020.31 ± 0.020.33 ± 0.010.37 ± 0.01
Stem fwt (g)73.9 ± 7.093.9 ± 11.375.3 ± 9.093.3 ± 5.732.1 ± 2.828.5 ± 3.124.3 ± 6.3
Stem dry wt (g)8.9 ± 2.015.9 ± 1.911.5 ± 2.316.6 ± 1.33.1 ± 1.02.5 ± 1.01.8 ± 0.7
fwt/dwt8.35.96.55.610.711.413.5
Stem diameter (mm)9.6 ± 0.69.6 ± 0.610.2 ± 0.712.4 ± 0.715.3 ± 1.215.8 ± 0.914.7 ± 1.5
Flower length (mm)48.3 ± 1.2553.3 ± 1.2550.3 ± 0.4753.3 ± 0.9434.7 ± 0.4733.0 ± 1.4133.7 ± 0.94
Total chlorophyll (mg m−2)416 ± 31335 ± 27394 ± 38330 ± 50556 ± 11588 ± 26678 ± 30
  • Results are given for three independent lines of each construct and represent the mean ±. fwt, fresh weight. dry wt, dry weight.