2.12 Statistical analysis
Statistical analysis was performed as described in our previous study (Z. Wang et al., 2014). A completely randomized block design with at least three biological replicates was applied for each experiment. Win-Excel was used to collect and classify the data, which was further analyzed using the SPSS statistical package (version 8.0). Tukey’s test was performed, and the P value (0.05) was used to indicate significance.