FIGURE 2.

Impact of Tre on the levels of osmoprotectant substances in rapeseed seedling under cold stress conditions. (A) Proline contents, (B) soluble sugar contents, and (C) soluble protein contents under four treatments [control (CK), CK + Tre, Cold, and Cold + Tre] and three stress conditions (4, 0, and –4°C). Tre indicates the application of 20 mM L^{– 1} of Tre. Data are expressed as the mean (± SD) from three biological replications for each sample and treatment. Asterisks show significant levels at ^****P < 0.0001, ^***P ≤ 0.001, ^**P ≤ 0.01, *P ≤ 0.05, and ns means non-significant.