Transport14C-markierter Assimilate im Phloem vonPelargonium zonaleundPhaseolus vulgaris
✍ Scribed by Johannes Willenbrink
- Book ID
- 104751796
- Publisher
- Springer-Verlag
- Year
- 1966
- Tongue
- English
- Weight
- 764 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0032-0935
No coin nor oath required. For personal study only.
✦ Synopsis
After the laminae of leaves of intact plants had been exposed to ~4C02 the translocation of 14C-labelled assimilates across the petioles starts very quickly: 6 to 1O rain later ~4C-activity could be detected in the basal part of the petioles. The way of distribution within the plant seems to be influenced m~inly by the age of the ~4C02-assimilating leaf, however, but not in the sense of an unidirectional movement; little but distinct amounts of ~4C were carried also from younger yet full expanded leaves down to older leaves, within 20 min (in Phaseolus) or 180 rain (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 ~C-labelled starch.