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Polar Movement of Ions in Barley Roots
Author(s) -
SINGH CHANCHAL,
JACOBSON LOUIS
Publication year - 1977
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.1399-3054.1977.tb09287.x
Subject(s) - polar , apex (geometry) , ion , movement (music) , chemistry , salt (chemistry) , root tip , biophysics , botany , biology , physics , organic chemistry , astronomy , acoustics
The movement of Na + , Rb + , Ca 2+ , Cl − , and THO was investigated in excised roots of six‐day‐old barley plants containing different initial salt contents. Ions applied at any point of a root segment, 12 cm long, moved strictly towards the base of the root. The polar movement was maintained even after removing different lengths of the apex and applying ions to the central zone of the remaining segment. Ions applied to either cut end also showed the same polar movement. The polar movement of ions was unaffected by the initial salt status. Tritiated water applied to the central zone of the segment moved in both the apical and basal direction. The ion movement was not correlated with the water movement. No current hypothesis of ion transport satisfactorily explains the observed polar movement.