Effect of 2,4-D on cell proliferation and elongation in the roots of Arabidopsis thaliana

Effect of 2,4-D on cell proliferation and elongation in the roots of Arabidopsis thaliana We investigated the effect of 2,4-D (2,4-dichlorophenoxyacetic acid) at concentrations of 1.5, 15, 30, and 60 nM on the growth of the main root of 3–7-d-old plants of Arabidopsis thaliana L. On the basis of measurements of the rate of root growth, lenght of fully elongated cells, and the number of cells in the meristem and elongation zone, we calculated the rates of cell proliferation and their transition to elongation, duration of cell cycle, and life span of cells in the meristem. At a concentration of 1.5 nM, 2,4-D did not affect these characteristics. At concentrations above 1.5 nM, 2,4-D noticeably retarded root growth, which was accounted for by a reduction in the length of cells that completed elongation, deceleration of cell proliferation and their transition to elongation, and prolongation of cell cycle and life span of the cells in the meristem. Thus, auxin decelerated root growth not only as a result of suppression of cell elongation but also at the higher concentrations via retardation of cell divisions in the meristem and their transition to elongation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effect of 2,4-D on cell proliferation and elongation in the roots of Arabidopsis thaliana

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Publisher
Springer Journals
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443716010064
Publisher site
See Article on Publisher Site

Abstract

We investigated the effect of 2,4-D (2,4-dichlorophenoxyacetic acid) at concentrations of 1.5, 15, 30, and 60 nM on the growth of the main root of 3–7-d-old plants of Arabidopsis thaliana L. On the basis of measurements of the rate of root growth, lenght of fully elongated cells, and the number of cells in the meristem and elongation zone, we calculated the rates of cell proliferation and their transition to elongation, duration of cell cycle, and life span of cells in the meristem. At a concentration of 1.5 nM, 2,4-D did not affect these characteristics. At concentrations above 1.5 nM, 2,4-D noticeably retarded root growth, which was accounted for by a reduction in the length of cells that completed elongation, deceleration of cell proliferation and their transition to elongation, and prolongation of cell cycle and life span of the cells in the meristem. Thus, auxin decelerated root growth not only as a result of suppression of cell elongation but also at the higher concentrations via retardation of cell divisions in the meristem and their transition to elongation.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Feb 16, 2016

References

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