Root-uptake of¹⁴C derived from acetic acid by root vegetables

Abstract

Sand culture using radish (Raphanus sativus L.) and hydroponics using carrot (Daucus carota L.) were conducted to examine root-uptake of carbon and its assimilation in the form of 14 C-acetic acid. 14 C-acetic acid (1, 2-14 C, radioactivity: 74 kBq) was added to each pot. Radishes were grown under the dark conditions or the light conditions for 24 h. Carrot were grown under the light conditions after 14 C-acetic acid addition (radioactivity: 19 kBq). The 14 C radioactivity in each plant part was determined. The distribution of 14 C in the plants was visualized using autoradiography. For a comparison, autoradiography was also done using 22 Na. The results indicated that the root vegetables absorbed 14 C through the roots and assimilated it into the shoots and edible parts. However, the amount of 14 C-acetic acid absorbed by plants through the roots was considered to be very small. Absorption and assimilation of 14 C seemed to be carried out not because of uptake of 14 C-acetic acid but because of uptake of 14 C in inorganic forms with very low concentration. 14 C dominantly transferred to the plant parts where were physiologically active. 14 C movement in the plant did not have a close relation to water movement unlike 22 Na movement.

Mitigation of N2O Emission from Aquaponics by Optimizing the Nitrogen Transformation Process: Aeration Management and Exogenous Carbon (PLA) Addition

“…But plant growth in PA was not affected by low nitrogen level. Studies have demonstrated that low-molecule organic carbon matter in the rhizosphere can be absorbed directly by plants possibly to balance the nutrient intake, − and the fermentation products of lactic acid are formic acid and acetic acid, which possibly promoted the growth of plants. However, nitrogen concentration in nutrient solution was proved to have an influence on the functional components in leaves of plants, so the quality of plants in PA still needed to be evaluated …”