2013 Fiscal Year Final Research Report

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

Research Project

Project/Area Number	23780030
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Horticulture/Landscape architecture
Research Institution	Miyagi University (2012-2013) National Agriculture and Food Research Organization (2011)
Principal Investigator	KIKUCHI Kaori 宮城大学, 食産業学部, 准教授 (30360530)
Project Period (FY)	2011 – 2012
Keywords	果菜 / 光合成 / 転流 / 日変化 / 非破壊計測 / ポジトロン / リアルタイム計測
Research Abstract	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.