Fig. 2

Principal component analysis (PCA) of the lipid composition upon different low-temperature treatments of Arabidopsis and rice. a PCA analysis of lipid content (nmol per mg). b PCA analysis of lipid relative content (mol%). Green and red symbols represent Arabidopsis and rice, respectively. The different treatments are represented by different shapes. −6, −12, 10 and 4 represent temperatures of treatment in °C. −6 °C and 10 °C are non-lethal low temperatures for Arabidopsis and rice, while −12 °C and 4 °C are lethal low temperatures for Arabidopsis and rice, respectively. T represents samples immediately after low-temperature treatment, R1 and R3 represent samples after 1 and 3 days of recovery growth