Developmental Patterns of Phytohormone Content in the Cortex and Pith of Potato Tubers as Related to Their Growth and Starch Content

Developmental Patterns of Phytohormone Content in the Cortex and Pith of Potato Tubers as Related... The contents of ABA, IAA, and cytokinins (zeatin + zeatin riboside) were determined in the cortex and pith of medium-sized (25 g) and large (120 g) tubers of potato (Solanum tuberosum L., cv. Malakhit) at the end of the flowering phase (48 days after sprouting) and related to plant growth (cell division and enlargement) and starch biosynthesis and deposition. The patterns of phytohormone distribution were different in the cortex and pith. In the latter, with most cells at the enlargement phase, the IAA content increased, as well as the ratios IAA/ABA and IAA/cytokinins. In the cortex dominated by the dividing cells, the ABA content declined, and the ratio cytokinins/ABA exceeded that in the pith. The enhancement of starch synthesis and accumulation in the pith and the retardation of these processes in the cortex followed the changes in the ABA content providing indirect support to the previously made observation that the exogenous ABA promoted starch biosynthesis. The data obtained are discussed in the context of the hormonal control of carbohydrate metabolism and starch deposition in growing tubers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Developmental Patterns of Phytohormone Content in the Cortex and Pith of Potato Tubers as Related to Their Growth and Starch Content

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Publisher
Springer Journals
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1021957022595
Publisher site
See Article on Publisher Site

Abstract

The contents of ABA, IAA, and cytokinins (zeatin + zeatin riboside) were determined in the cortex and pith of medium-sized (25 g) and large (120 g) tubers of potato (Solanum tuberosum L., cv. Malakhit) at the end of the flowering phase (48 days after sprouting) and related to plant growth (cell division and enlargement) and starch biosynthesis and deposition. The patterns of phytohormone distribution were different in the cortex and pith. In the latter, with most cells at the enlargement phase, the IAA content increased, as well as the ratios IAA/ABA and IAA/cytokinins. In the cortex dominated by the dividing cells, the ABA content declined, and the ratio cytokinins/ABA exceeded that in the pith. The enhancement of starch synthesis and accumulation in the pith and the retardation of these processes in the cortex followed the changes in the ABA content providing indirect support to the previously made observation that the exogenous ABA promoted starch biosynthesis. The data obtained are discussed in the context of the hormonal control of carbohydrate metabolism and starch deposition in growing tubers.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 17, 2004

References

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