Photosynthesis, Carbohydrate Storage and Remobilization During Grain Filling as Affected by Sulphur Application in Winter Wheat

摘要

Photosynthesis and carbohydrate storage and remobilization was investigated during grain filling of winter wheat (Triticum aestivum L., cv. Lumai 22) in sulphur application experiments where the available sulphur (S) content in the soil of 0-20 cm soil layer was 5.84 mg kg~(-1). Two levels of S were applied as S_0 (0 kg S ha~(-1)) and S_1 (67.5 kg S ha~(-1)). The results showed that net photosynthetic rate of flag leaf of S_1 treatment was significantly higher than S_0 treatment, and it increased gradually from anthesis to 35 DAA. Sucrose-phosphate synthase (SPS) activity and sucrose content of S_1 treatment were significantly higher than those of S_0 treatment. The contents of total soluble sugar, sucrose, fructose, glucose, DP3 and DP ≥ 4 fructan in stem and sheath of S_1 treatment were significantly higher than those of S_0 treatment also. The amount of total soluble sugar and fructans remobilization from stem and sheath and the starch accumulating rate in grain of S_1 treatment was significantly higher than those of S_0 treatment. It is suggested that sulphur application increase photosynthate remobilization from stem and sheath to grain at later filling stage.