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Effect of low-temperature stress on the maximum quantum efficiency of ΦPSII photochemistry (Fv/Fm) and the quantum yield of PSII electron transport (PSII) among CA157, CA52, and CL122. The Y-axis represented the Fv/Fm value; the X-axis represented the 6-week-old seedlings measured at 0, 1, 3, 5, and 7 d of 4°C treatment. Data are presented as mean ± SE. *p < 0.05, **p < 0.01.
