Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Plant, cell & environment
1 (1978), S. 0
ISSN:
1365-3040
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Abstract This paper describes experiments to test the suggestion that developing xylem vessels are the site of exudation of ions from the root to the shoot. Electron microscopy is used to define the stage of development of xylem vessels in young barley roots along the length of the root. The amino acid analogue p-fluorophenyl-alanine (FPA) is used to inhibit ion transport from the stele to the xylem vessels at varied distances from the apex. In the presence of FPA protein synthesis is not inhibited but ineffective proteins are formed. It is shown that exudation of Cl− from the root can be inhibited in this way in parts of the root where all the xylem vessels are mature. This is in contradiction to the suggestion that root exudation is due to the activity of developing vessels. The hypothesis is thus strengthened that ion transport proceeds into the xylem vessels, which are fully mature and devoid of cytoplasm, and is due to release from the xylem parenchyma cells.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-3040.1978.tb00764.x
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