Absorption of 13CO2 and subsequent partitioning of labeled photosynthates in chinese chive [Allium tuberosum] before and after harvest
2006
Ahn, D.H.(Ibaraki-ken. Horticultural Research Inst., Iwama (Japan)) | Ikeda, H.
To follow the partitioning of 13C-labeled photosynthates, the roles of the treated leaf, new leaf, bulb, basal stem and roots of Chinese chive were examined. The aerial part was cut 10 h after 13C was administered to a leaf. The distribution and content of 13C in the each organ were recorded daily for 3 days, while the dry matter assimilated by the organs stored in the light or dark was weighed every 5 days for 20 days. After the 13CO2 feeding, the amount and partition rate of 13C in the leaf decreased for 72 h, but that in the roots increased. After removing the treated leaf, the amount and partition rate of 13C in the leaf increased, but decreased in the bulb and roots as a new leaf developed. After cutting, the decrease of the amount and the partition rate of 13C in the roots became small in the light compared to the kept in the dark. Their difference between the light and dark treatments became larger from 10 days after cutting. It is thought that the photosynthates are translocated and accumulated by the bulb and roots because they are storage organs. The new leaf, developing with a limited photosynthetic capacity, relies on being supplied stored products from the bulb and roots immediately after cutting; this dependency on stored food decreases from about 10 days after cutting because its photosynthetic capacity increases.
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