不同穗型小麦品种灌浆期碳氮代谢特点及其与源库的关系

Study on C-N Metabolic Characteristics and Source-sink Rel ationship During Grain Filling Stage in Two Winter Wheat Cultivars with Differe n t Spike Type

豫麦 4 9号和豫麦 6 6号旗叶光合速率、SPS活性和WSC含量在灌浆期均呈单峰曲线 ,但豫麦 6 6号的峰值出现偏晚 ,而且灌浆中后期叶片代谢活性下降缓慢 ,显示出源端较强的同化物持续供应能力。两品种旗叶NR活性变化趋势基本相同 ,但开花后 5～ 2 0d ,豫麦 4 9号旗叶NR活性高于豫麦 6 6号 ,开花后 2 0～ 35d内情况则相反。子粒中IAAO活性变化呈双峰曲线 ,在整个灌浆期子粒淀粉积累速率豫麦 4 9号呈双峰曲线 ,豫麦 6 6号则表现为单峰曲线 ,而且峰值出现较晚但持续时间较长 ,显示出豫麦 6 6号后期仍可保持较强的库活性。

Two winter wheat cultivars with Yumai 66 and Yumai 49, were used to study their C N metabolic characteristics and source sink relationship during grain fillin g stage. Changes of photosynthetic rate, SPS activity and WSC content in flag le af appeared to be a single peak curve, but Yumai 66 reached the peak a little l ater than that of Yum ai 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 supe rior to Yumai 66 during 5-20 d after anthesis, it had an opposite trend during 20-35 d after anthesis. Change of IAAO activity in kernel came to be a double p eak curve. Starch accumulating rate of Yumai 49 had a double peak curve during the whole filling stage. But that of Yumai 66 had a single peak curve, the peak came a little later than that of Yumai 49, but it sustained a long time. It sho wed that Yumai 66 maintained stronger'sink'activity during the later stage.