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The comparison of the germination rate under low temperature of 253 and Y12–4 in the control and in the cold treatment. CK indicates control treatment; CT indicates cold treatment. Vertical bar indicates standard error. a: 253 and Y12–4 under 25 °C for 7d; b: 253 and Y12–4 under 4 °C for 10d and recovered for 5d; c: the germination rate of 253 and Y12–4 under normal and cold treatment
