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Response of Leaf Anatomical Structure and Photosynthetic Characteristics of Winter Turnip Rape ( Brassica rapaL.) to Low Temperature before Winter

XU Yao-Zhao^1,^2,^**, ZENG Xiu-Cun^1,^2,^**, ZHANG Fen-Qin², SUN Jia³, SUN Wan-Cang^1,^*, WU Jun-Yan¹, FANG Yan¹, LIU Zi-Gang¹, SUN Bo-Lin²

环境温度和光合有效辐射的日变化