Fig. 7

Boxplots showing the effect of control (C) and cold stress (CS) conditions on the electrolyte leakage (EL), relative leaf water content (RLWC), stomatal conductance (SC), chlorophyll content (SPAD), photosynthetic efficiency (PE), and carotenoids (CART) across two consecutive screening years (1 and 2). Boxes represent interquartile ranges; whiskers indicate variability outside the upper and lower quartiles; dots represent outliers.