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• W2157457457 abstract "Abstract. Profiles of self-generated ion currents associated with the growing primary root tips of intact Hordeum vulgare L. and Trifolium repens L. (nonnodulated) seedlings were measured using a highly sensitive vibrating electrode in media containing NH+4 or NO-3, and compared to control roots growing in nitrogen free media. Under these three nutrient regimes, positive current entered the root at regions corresponding to the meristematic tissues and main elongation zones of root tips and left from the mature root tissues. Mapping the surface of the roots with a pH-sensitive microelectrode revealed regions of external alkalinity where positive electrical current entered the root, and external acidity where positive current exited. The correlation between pH-profile and the pattern of ion current generation in these experiments suggests that H+ ions were responsible for carrying the bulk of the root-generated current. Assimilation of NHJ results in net H+ extrusion while assimilation of NO-3, results in net OH-3 efflux. Growth on NH+4, as compared to growth on NO-3, stimulated the magnitude of the electrical current but did not affect significantly the growth rate of the roots. However, despite the differing stresses on internal pH regulation that arise due to growth on the two exogenous forms of combined nitrogen, the current profiles were qualitatively similar under the different conditions that were examined. The role of the circulating proton current is not yet known; however, the constancy of the current profile under different nutrient regimes sustains the hypothesis that the current may have a role in the regulation of root polarity." @default.
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• W2157457457 date "1991-08-01" @default.
• W2157457457 modified "2023-09-23" @default.
• W2157457457 title "Ion currents and the nitrogen status of roots of Hordeum vulgare and non-nodulated Trifolium repens" @default.
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• W2157457457 doi "https://doi.org/10.1111/j.1365-3040.1991.tb01526.x" @default.
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