Figure 2: Time course analyses of methane production and soluble sugar content in two maize cultivars upon 20% PEG-6000 treatment.

5-d-old maize seedlings of ZD958 and ZJY1 were transferred to half-strength Hoagland solutions containing 20% PEG-6000 for another 5 d. Endogenous methane (a) and total soluble sugar (b) contents in root tissues were determined at the indicated time points. Control seedlings were incubated in Hoagland solution alone. Data are presented as means ± SE (5 root parts per experiment performed three times).