Figure 3. Means ± 1 standard error of sunflower plasticity in response to cold treatment (5°C night and 18°C day) for above-ground (green) and root (brown) traits. Values less than 1 indicate a lower value for the cold than control treatment, while values greater than 1 indicate a higher value for the cold than control treatment. Asterisks indicate the significance of the Student’s t-test between the cold and control treatments. ***: p < 0.001, **: p < 0.01, *: p < 0.05, NS: non-significant. Root diameter, projected area, length, weight and number of roots tip were measured under hydroponic conditions only, while other traits were measured under both potted soil and hydroponic conditions. Corresponding experimentations were 19CA01, 20CA01,20CA03, 22CA01, 19CA04, 20CA02, 20HP01, 21HP01, 22HP02.