Effects of different phosphorus nutrition levels on photosynthesis in satsuma mandarin (Citrus unshiu Marc.) leaves Roles of Sucrose2Metabolizing Enzymes in Accumulation of Sugars inSatsuma Mandarin Fruit Phosphorus deficiency stress aggravate photoinhibition of photosynthesis and function of xanthophyll cycle in citrus leaves Roles of Sucrose2Metabolizing Enzymes in Accumulation of Sugars inSatsuma Mandarin Fruit Attenuation of Cbilliog Efect on Photosynthesis of Satsuma Mandarin(Citrus unshiu Marc.)by NaHSO3 Application Attenuation of Cbilliog Efect on Photosynthesis of Satsuma Mandarin(Citrus unshiu Marc.)by NaHSO3 Application