春小麦灌浆期功能叶^14C同化物源—库调控

利用＾１４ＣＯ２示踪研究春小麦灌浆期旗叶同化物在源训间运转与分配。结果表明，上午同化产物在同化４ｈ的输出占２４ｈ输出的７０％；下午同化的只有３１％。基本上是同化后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＾１Ｃ可溶性糖＾１４Ｃ同化物的始终较高，同化后１０ｈ平均为６４．３％（＾１４Ｃ蔗糖为４５．７％）和６６．９％（＾１４Ｃ蔗糖

Source sink Regulation of Assimilates from Functional Leaves During Grain Filling Stage in Spring Wheat

Translocation and distribution of flag leaf assimilates between source and sink was detected by trace atom 14 C 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. 14 C soluble sugur( 14 C sucrose)was aways higher in the proportion of 14 C assimilates.It was also found that first assimilating for first accumulation in grains and higher content of 14 C soluble sugur ( 14 C sucrose)indicated that a certain time was required for convertion of sugur into starch.