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

CLC Number: 

• S512.1