Figure 2.
Changes in quantum yield of photosystem II (ΦPSII) and electrolyte leakage of leaves of perennial ryegrass (Lolium perenne L.) variety “Veyo” and ecotype “Falster” during freezing at −10°C. Changes in ΦPSII in (A) leaves of “Veyo” and (B) leaves of “Falster.” Changes in electrolyte leakage (%) in (C) leaves of “Veyo” and (D) leaves of “Falster.” Data represent the mean ± SE, obtained from three biological replicates of the analysis. The experiments were repeated twice. Asterisks indicate significant differences (P < 0.05) from 0 d in (A,B) and from 0 min in (C,D).