Die räumliche und chemische Verteilung durch die Wurzel aufgenommener organischer Rotteprodukte bei Daucus Carota
Die räumliche und chemische Verteilung durch die Wurzel aufgenommener organischer Rotteprodukte bei Daucus Carota
In continuation of earlier work the uptake of organic decomposition products by the roots of Daucus carota and the incorporation of such substances into different organs and chemical fractions of the plants have been investigated. Each experimental pot, containing 4 plants in 1 liter of nutrient sol...
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Personal Name(s): | Führ, Fritz |
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Sauerbeck, D. | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Kernforschungsanlage Jülich, Verlag
1965
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Physical Description: |
15 p. |
Document Type: |
Report Book |
Research Program: |
ohne Topic |
Series Title: |
Berichte der Kernforschungsanlage Jülich
302 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
In continuation of earlier work the uptake of organic decomposition products by the roots of Daucus carota and the incorporation of such substances into different organs and chemical fractions of the plants have been investigated. Each experimental pot, containing 4 plants in 1 liter of nutrient solution, received 150 mg labeled carbon from a water extract, a NaOH-Extract, and the fulvic acids respectively, or 75 mg carbon of the humic acid fraction, all of which where obtained from an incubation mixture of $^{14}$C-labeled barley shoots. As in earlier experiments after 3 days between 14 and 31 % of the applied radiocarbon was associated with the plants. But 76 to 90 % thereof remained in the roots. Shoots and carrots contained at most 11 and 13 % respectively, but only 1 or 12 % respectively after application of humic acids. Hence the translocation into the upper plants parts decreased with the increasing molecular weight of the decomposition products. Radioautographs of carrot and root microtome sections showed the same characteristic accumulation of the applied radiocarbon on or perhaps in the epidermis as already noted in former experiments, in contrast to a relatively low radioactivity of the inner parts. This was most pronounced with the radiocarbon of humic acids. The results of a chemical group analysis showed that, irrespective of the organic fraction applied, in shoots and carrots (except the carrots of plants treated with humic acids) an accumulation of radiocarbon in the components of the sugar metabolism took place. This leads to the conclusion that mainly the low molecular cleavage products of humic material can be taken up and metabolized by plants. The by far higher accumulation of radiocarbon in the high molecular or insoluble fractions of the roots was attributed to an unsatisfactory differentiation between adsorbed and absorbed humic compounds. |