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PtFLC, PtHB13, PtFT, and PtLFY are regulated by temperature changes in citrus. (a) Relative expression levels of PtFLC, PtHB13, PtFT, and PtLFY in citrus callus at 25 °C and 15 °C for 1 day. (b) Changes in transcript levels of PtFLC, PtHB13, PtFT, and PtLFY under low-temperature conditions. (c) Relative expression levels of PtFLC, PtHB13, PtFT, and PtLFY in citrus trees buds from July to March. Asterisks indicate significant differences (Student’s t-test): ** P < 0.01.
