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春小麦灌浆期功能叶14C同化物源-库调控

DOI: 10.3321/j.issn:1000-7091.1997.03.006, PP. 30-35

Keywords: 春小麦,14C同化物,源-库调控

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Abstract:

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。

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