Analysis of the diurnal change of the photoassimilate dynamic state in fruit vegetables using positron-emitting tracer imaging system

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The following experiments was done after 5, 30, 180, 360,420, 600 and 780 min of continuous light pretreatment. The 11CO2 gas tracer was fed to the leaf and carbon translocation from leaf to fruit was measured with PETIS. The amount of carbon fixation was fewer of 5 and 30 min of light pretreatment than that other minutes pretreatment. As a result, volume and velocity of carbon translocation became low in 5 and 30 min pretreatment. It has been reported that the positive correlation between photosynthetic rate and the velocity of carbon export from the leaf. The above result supported this report. On the other hand, in the case of 780 min of light pretreatment, the measurement condition soon after fed 11CO2 gas shift to darkness. At this time, although the amount of carbon fixation was not low, the velocity and volume of carbon translocation under dark condition were greatly decreased. The carbon translocation under the night condition require greater consideration.