Table II.

Comparative effect of exogenous GA1application on the rate of elongation of na plants

TreatmentRate of Elongation (mm d−1)
D 1–2D 2–3
Continuous dark control4.0 ± 0.65.2 ± 0.5
Continuous dark applied30.2 ± 1.325.3 ± 1.2
Difference26.220.1
Late transfer control2.1 ± 0.31.5 ± 0.2
Late transfer applied9.6 ± 0.614.2 ± 1.7
Difference7.512.7
Early transfer control1.7 ± 0.11.9 ± 0.3
Early transfer applied8.5 ± 0.610.1 ± 1.5
Difference6.88.2
Continuous light control3.3 ± 0.23.3 ± 0.2
Continuous light applied9.4 ± 0.810.5 ± 1.2
Difference6.17.2

The plants were either grown in continuous dark, WL, or transferred from continuous darkness to WL conditions. GA1 was applied directly to internode 2-3, 6 d after planting. Late transfer plants were transferred to WL 1 d after GA1application. Early transfer plants were transferred 1 d before GA1 application. The rate of elongation was calculated by measuring the change in total shoot length after a 24 h period.n ≥ 14.