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C-N Metabolic Characteristics in Flag Leaf and Starch Accumulating Developments in Seed during Grain Filling Stage in Two Winter Wheat Cultivars with Different Spike Type

Two winter wheat cultivars with large spike type cultivar Yumai 66 and small spike type cultivar Yumai 49, were used to study their C N metabolic characteristics in flag leaf and starch accumulated in kernel during grain filling stage. Changes of photosynthetic rate, SPS activity and WSC content in flag leaf appeared to be a single peak curve, but Yumai 66 reached the peak a little later than that of Yumai 49, and leaf metabolic activity decreased slowly during later filling stage. It showed that “Source” had strong supplying ability of assimilating matter. NR activity of flag leaf in two cultivars had the same trend, but Yumai 49 was superior to Yumai 66 during 5~20d after anthesis, it had an opposite trend during 20 35d after anthesis. Change of IAAO activity in seed came to be a double peak curve, its peak appeared in 15d and 30d after anthesis, respectively. It presented significant positive correlation ( r =0.7639 ** ) between SS activity and starch accumulating rate. Change of SS activity had a single peak curve during the whole filling stage. The peak of Yumai 66 came a little later than that of Yumai 49, but it sustained a long time. Starch accumulating rate had the same trend. It showed that Yumai 66 maintained stronger “sink” activity during the later stage.