Interactions of auxin and gibberellin in the control of basal growth of Arabidopsis rosette leaves

Interactions of auxin and gibberellin in the control of basal growth of Arabidopsis rosette leaves Arabidopsis is a species that naturally displays the rosette form. Therefore, elucidation of the factors, which control basal leaf development, is of particular interest. Most evidence points that auxins and gibberellins are important in the control of rosette leaf development. In this paper, we report on a regimen that disrupts the normal rosette growth in Arabidopsis and induces internodal growth, which we have termed unbasal. The growth conditions are: (1) seed germination in the presence of 2,3,5-triiodobenzoic acid (TIBA); (2) transfer of the seedlings to a medium containing exogenous auxin (NAA) and GA3; (3) transfer of the seedlings to a GA3-only medium for all subsequent growth. Under these conditions, auxin and GA interact to induce internode elongation. Polar auxin transport appears to have a temporal effect on this synergistic interaction. In this regimen, GA increases auxin activity in the basal portions of the stem. Cross sectional morphology of the elongated internodes between two rosette leaves in an un-basal plant was similar to that seen for the pin1 Arabidopsis mutation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Interactions of auxin and gibberellin in the control of basal growth of Arabidopsis rosette leaves

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Publisher
Springer Journals
Copyright
Copyright © 2010 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Sciences ; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443710060105
Publisher site
See Article on Publisher Site

Abstract

Arabidopsis is a species that naturally displays the rosette form. Therefore, elucidation of the factors, which control basal leaf development, is of particular interest. Most evidence points that auxins and gibberellins are important in the control of rosette leaf development. In this paper, we report on a regimen that disrupts the normal rosette growth in Arabidopsis and induces internodal growth, which we have termed unbasal. The growth conditions are: (1) seed germination in the presence of 2,3,5-triiodobenzoic acid (TIBA); (2) transfer of the seedlings to a medium containing exogenous auxin (NAA) and GA3; (3) transfer of the seedlings to a GA3-only medium for all subsequent growth. Under these conditions, auxin and GA interact to induce internode elongation. Polar auxin transport appears to have a temporal effect on this synergistic interaction. In this regimen, GA increases auxin activity in the basal portions of the stem. Cross sectional morphology of the elongated internodes between two rosette leaves in an un-basal plant was similar to that seen for the pin1 Arabidopsis mutation.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 31, 2010

References

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