摘要： 利用¹⁴CO₂示踪研究春小麦灌浆期旗叶同化物在源库间运转与分配。结果表明，上午同化产物在同化后4h的输出占24h输出的70%;下午同化的只有31%,基本上是在同化后10h输出。不过两者同化后24h总输出基本一致，均在67%左右。同化的产物输出有“排队现象”,即先同化先输出。叶片中¹⁴C可溶性糖（¹⁴C蔗糖）占¹⁴C同化物的比例始终较高，同化后10h平均分别为64.3%（¹⁴C蔗糖为45.7%）和66.9%（¹⁴C蔗糖为52.6%）.籽粒中¹⁴C同化物的积累有先同化先进入现象。还发现¹⁴C可溶性糖（含¹⁴C蔗糖）在籽粒中相对含量始终很高，这表明其转化成淀粉需要一定时间。

关键词: 春小麦, ¹⁴C同化物, 源－库调控

Abstract: Translocation and distribution of flag leaf assimilates between source and sink was detected by trace atom ¹⁴C during grain filling stage of spring wheat.The results suggested that the output rate of assimilation product after 4 hours in the morning made up 70% of that after 24 hours,in the afternoon the assimilation product only made up 31% which was basically exported 10 hours after assimilating. The total output rate after 24 hours showed no difference between morning and afternoon(67%).There was a trend that first assimilating for first output. ¹⁴C soluble sugur( ¹⁴C sucrose)was aways higher in the proportion of ¹⁴C assimilates.It was also found that first assimilating for first accumulation in grains and higher content of ¹⁴C soluble sugur ( ¹⁴C sucrose)indicated that a certain time was required for convertion of sugur into starch.

Key words: Spring wheat, ¹⁴C assimilate, Source sink regulation

中图分类号: 

• S512.1