摘要： 豫麦9号和豫麦66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66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5～20 d,豫麦9号旗叶NR活性高于豫麦66号,开花后20～35 d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9号呈双峰曲线,豫麦66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66号后期仍可保持较强的库活性.

关键词: 冬小麦, 穗型, 碳氮代谢, 源库关系

Abstract: Two winter wheat cultivars with Yumai 66 and Yumai 49, were used to study their C-N metabo-Lic characteristics and source-sink relationship during grain filling stage.Changes of photosynthetic rate, SPS ac-tivity 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/Source0had 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 5-20 d after anthesis, it had an opposite trend dur-ing 20-35 d after anthesis.Change of IAAO activity in kerneLcame to be a double-peak curve.Starch accumu-lating rate of Yumai 49 had a double-peak curve during the whole filling stage.But that of Yumai 66 had a sin-gle-peak curve, the peak came a little later than that of Yumai 49, but it sustained a long time.It showed that Yumai 66 maintained stronger/sink0activity during the later stage.

Key words: Winter wheat, Spike type, C-N metabolism, Source-sink relationship

中图分类号: 

• S512