PMID: 11604455Oct 18, 2001Paper

Ion fluxes, auxin and the induction of elongation growth in Nicotiana tabacum cells

Journal of Experimental Botany
K VissenbergJ P Verbelen

Abstract

Immobilized cultured tobacco cells become polarized upon the addition of naphthalene-1-acetic acid and start to elongate from an initial spherical shape. The question as to how a diffuse-growing cell forms a polar axis is addressed here with approaches successfully applied to the study of tip growth. With two kinds of vibrating probes the electric current flow and proton fluxes were mapped around such elongating cells. No consistent polar pattern of ion fluxes, which is typical for actively tip-growing cells, was detected. Therefore, other signals must provide the positional information needed for polar axis formation. Furthermore, neither a specific pattern of intracellular Ca(2+) concentration nor a polar distribution of putative ion-channel antagonist-binding sites were found in elongating tobacco cells. Auxin flux, on the other hand, was found to be important as TIBA, an inhibitor of polar auxin transport, clearly inhibited elongation in a concentration-dependent way. Cross-linking of arabinogalactan-proteins with the beta-Yariv reagent also resulted in inhibition of elongation. A model is proposed for the induction of polar growth where localized auxin efflux starts a signal cascade that triggers molecules that reorient mi...Continue Reading

Citations

Jul 23, 2008·The Plant Journal : for Cell and Molecular Biology·Bella LevitinMoriyah Zik
May 13, 2009·Journal of Experimental Botany·Sílvia CoimbraLuís Gustavo Pereira
Aug 17, 2002·The Plant Journal : for Cell and Molecular Biology·Zhan Dong ZhaoMarcia Jane Kieliszewski
Jan 5, 2007·Annual Review of Plant Biology·Georg J Seifert, Keith Roberts
Jul 15, 2003·Plant Physiology·René BenjaminsRemko Offringa

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