Translocation of labelled assimilates following photosynthesis of 14CO2 by the field bean, Vicia faba

Autor: C. P. Lloyd‐Jones, D. G. Hill‐Cottingham, Hilary J. Crompton
Rok vydání: 1981
Předmět:
Zdroj: Physiologia Plantarum. 51:189-194
ISSN: 1399-3054
0031-9317
DOI: 10.1111/j.1399-3054.1981.tb02697.x
Popis: When whole plants were exposed to 14CO2, almost the same amount of radioactivity was taken up initially by each leaf regardless of its position on the stem and of the presence of beans at that node. Thus, although developing beans are a powerful sink for assimilated carbon, they do not increase the CO2 uptake by adjoining leaves. The distribution of labelled assimilates 6 hours after feeding 14CO2 to a single leaf for 1 hour varied with both the position of the treated leaf and the stage of development of the plant. Before any flowers were set most of the radioactivity from all expanded leaves moved downwards to the roots and the stem below the treated leaf (lower stem). Later, during pod-fill, the upper leaves maintained this supply to the roots and lower stem, whilst most of the carbon translocated from the lower and mid-stem leaves went to the beans. However, we found no exclusive relationship between a leaf and the supply to beans developing on the same node. The amount of radioactivity moving out of a source leaf at a fruiting node increased over successive samplings up to 48 h; the pattern of distribution of the 14CO2 however remained virtually unchanged.
Databáze: OpenAIRE
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