Table 3.
Terpenoid levels (ng mg–1 dw) in Bt and non-Bt cotton in the field experiment. (Terpenoid concentration (mean±s.e.; n = 2) in the youngest fully developed leaf of Bt and non-Bt cotton plants collected in the field on 20 July 2009. HGQ, hemigossypolone; G, gossypol; H1–H4, heliocide 1–4. Spodoptera exigua infested plants: plants that were artificially infested with S. exigua larvae. Naturally infested plants: plants that were exposed to natural infestation by herbivores.)
| treatment | terpenoids |
t-test |
concentration (ng mg–1 dw±s.e.) |
||
|---|---|---|---|---|---|
| t | p-value | Bt | non-Bt | ||
| S. exigua infested plants | HGQ | 0.35 | 0.75 | 3255±1039.2 | 3799±1155.0 |
| G | 6.88 | 0.02 | 5687±178.1 | 7476±189.6 | |
| H1/H4 | 0.51 | 0.66 | 842±153.1 | 949±140.8 | |
| H2/H3 | 0.68 | 0.56 | 2363±448.1 | 2723±281.7 | |
| total | 4.65 | 0.043 | 12149±260.1 | 14949±542.9 | |
| naturally infested plants | HGQ | 0.18 | 0.88 | 2193±506.9 | 2336±634.3 |
| G | 0.75 | 0.53 | 4370±698.0 | 4960±364.0 | |
| H1/H4 | 0.41 | 0.72 | 623±50.8 | 654±57.6 | |
| H2/H3 | 0.26 | 0.82 | 1798±153.5 | 1864±193.5 | |
| total | 0.59 | 0.62 | 8986±1409.3 | 9815±19.2 | |