Transport 14C-markierter Assimilate im Phloem von Pelargonium zonale und Phaseolus vulgaris
- 1 January 1966
- journal article
- research article
- Published by Springer Nature in Planta
- Vol. 71 (2), 171-183
- https://doi.org/10.1007/bf00390136
Abstract
After the laminae of leaves of intact plants had been exposed to 14CO2 the translocation of 14C-labelled assimilates across the petioles starts very quickly: 6 to 10 min later 14C-activity could be detected in the basal part of the petioles. The way of distribution within the plant seems to be influenced mainly by the age of the 14CO2-assimilating leaf, however, but not in the sense of an unidirectional movement; little but distinct amounts of 14C were carried also from younger yet full expanded leaves down to older leaves, within 20 min (in Phaseolus) or 180 min (in Pelargonium). Besides sucrose, which was shown by paper chromatography to be the main form of assimilates translocated in these species, we identified sugar phosphates, hexoses, and some organic acids in the petiole and stem tissue as being radioactive also. In our experiments, the petiole segments did not contain any remarkable amount of 14C-labelled starch. 6–10 min nach Beginn der 14CO2-Assimilation befindet sich 14C-Aktivität im Stiel des 14CO2-exponierten Blattes belichteter Pflanzen von Pelargonium zonale und Phaseolus vulgaris. Die Verteilungsrichtung der Assimilate im Sproß scheint vor allem durch das Alter des 14C-assimilierenden Blattes bestimmt, jedoch nicht einseitig festgelegt zu sein; geringe, aber faßbare Mengen an 14C-Saccharose wereden innerhalb von 20 min (bei Phaseolus) und 180 min (bei Pelargonium) auch aus relativ jüngeren in ältere Blätter transportiert. Neben 14C-Saccharose wurden im Blattstiel-und Stengelgewebe stets markierte Zuckerphosphate, Hexosen und organische Säuren nachgewiesen. Stärke war nur zu einem verschwindend geringen Anteil an der Gesamtmarkierung der analysierten Transportstrecken beteiligt.This publication has 17 references indexed in Scilit:
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