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Phloem Unloading in Stem Parts Parasitized by Cuscuta : The Release of 14 C and K + to the Free Space at 0°C and 25°C
Author(s) -
WOLSWINKEL PIETER
Publication year - 1978
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1978.tb02542.x
Subject(s) - efflux , phloem , cuscuta , parenchyma , sieve tube element , vicia faba , biology , botany , biophysics , biochemistry
By washing out 14 C‐solutes or K + from the free space of stem segments of Vicia faba L. and Urtica dioica L., efflux from stem tissues was measured. At 25°C the efflux of 14 C or K + from non‐parasitized stem parts was found to be comparable with the pattern known for parenchyma cells. The efflux pattern from parasitized stem parts kept at 0°C was also a normal one, but at 25°C a more complicated pattern was found. After addition of metabolic inhibitors, however, the efflux pattern appeared to be comparable with the pattern found in 0°C experiments. Also, after washing stem segments for several hours in water at 0°C, Phloem unloading was shown to start unimpeded after transfer to 25°C. Stem parts parasitized by Cuscuta can be regarded as a model system for studying the fundamental processes underlying movement out of sieve tubes in strong sink regions.