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Ultrastructure and Its Function of Phloem Cell in Abdominal Vascular Bundle of Wheat Caryopsis Studies on Carbohydrate Content and Sucrose-metabolizing Enzymes Activities in Different Parts of Tomato Studies on Carbohydrate Content and Sucrose-metabolizing Enzymes Activities in Different Parts of Tomato Effect of neighboring competition on photosynthetic characteristics and biomass allocation of Chinese fir seedlings under low phosphorus stress