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THE MOVEMENT OF RUBIDIUM ACROSS THE ROOT OF HORDEUM VULGARE (L)
Author(s) -
CROSSETT R. N.
Publication year - 1966
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1966.tb05968.x
Subject(s) - nuclide , rubidium , chromosomal translocation , shoot , absorption (acoustics) , chemistry , radiochemistry , kinetics , hordeum vulgare , radionuclide , botany , horticulture , biology , nuclear physics , physics , poaceae , biochemistry , potassium , organic chemistry , acoustics , gene , quantum mechanics
S ummary An automatic system is described for the continuous measurement of absorption and translocation of radioactive nuclides by living plants growing in a controlled environment. The system is suitable for studying the behaviour of nuclides emitting β particles in the energy band between 0.5 and 2.5 MeV. The reliability and precision of the system are discussed. Experiments on the absorption and translocation of 86 Rb by 10‐14‐day‐old seedlings of barley are reported. It was found that when 86 Rb was absorbed from 10 −5 M 86 RbNO 3 the rate of movement into the shoot (translocation) increased with time, but that when absorption was from a higher concentration of RbNO 3 a constant rate of translocation was observed after the initial rise during the first 3 hours. When radioactive seedlings were placed in an inactive 10 −5 m RbNO 3 solution no loss of 86 Rb to the solution was detected, but 86 Rb moved to the shoot, the decrease of 86 Rb in the root following first‐order kinetics. When radioactive seedlings were transferred to a 10 −4 m RbNO 3 solution more complex kinetics of decrease in 86 Rb in the root were observed. The findings are discussed and found to be compatible with a simple two‐compartment model of the root.