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Dynamic root exudation of sorgoleone and its in planta mechanism of action
The oily droplets exuded from the root hairs of sorghum are composed of a 1:1 ratio of sorgoleone and its lipid resorcinol analogue. The production of these droplets appears to be suppressed when c. 20 μg of exudate mg(−1) root dry weight accumulates at the tip of the root hairs. However, more exuda...
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Formato: | Texto |
Lenguaje: | English |
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Oxford University Press
2009
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2682501/ https://www.ncbi.nlm.nih.gov/pubmed/19357432 http://dx.doi.org/10.1093/jxb/erp082 |
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author | Dayan, Franck E. Howell, J'Lynn Weidenhamer, Jeffrey D. |
author_facet | Dayan, Franck E. Howell, J'Lynn Weidenhamer, Jeffrey D. |
author_sort | Dayan, Franck E. |
collection | PubMed |
description | The oily droplets exuded from the root hairs of sorghum are composed of a 1:1 ratio of sorgoleone and its lipid resorcinol analogue. The production of these droplets appears to be suppressed when c. 20 μg of exudate mg(−1) root dry weight accumulates at the tip of the root hairs. However, more exudate is produced following gentle washing of the roots with water, suggesting that the biosynthesis of lipid benzoquinones and resorcinols is a dynamic process. Sorgoleone interferes with several molecular target sites, including photosynthetic electron transport, in in vitro assays. However, the in planta mechanism of action of sorgoleone remains controversial because it is not clear whether this lipid benzoquinone exuding from the roots of sorghum is taken up by roots of the receiving plants and translocated to their foliage where it must enter the chloroplast and inhibit PSII in the thylakoid membrane. Experiments designed to test the in planta mode of action of sorgoleone demonstrated that it has no effect on the photosynthesis of older plants, but inhibits photosynthesis in germinating seedlings. Sorgoleone is not translocated acropetally in older plants, but can be absorbed through the hypocotyl and cotyledonary tissues. Therefore, the mode of action of sorgoleone may be the result of inhibition of photosynthesis in young seedlings in concert with inhibition of its other molecular target sites in older plants. |
format | Text |
id | pubmed-2682501 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-26825012009-05-15 Dynamic root exudation of sorgoleone and its in planta mechanism of action Dayan, Franck E. Howell, J'Lynn Weidenhamer, Jeffrey D. J Exp Bot Research Papers The oily droplets exuded from the root hairs of sorghum are composed of a 1:1 ratio of sorgoleone and its lipid resorcinol analogue. The production of these droplets appears to be suppressed when c. 20 μg of exudate mg(−1) root dry weight accumulates at the tip of the root hairs. However, more exudate is produced following gentle washing of the roots with water, suggesting that the biosynthesis of lipid benzoquinones and resorcinols is a dynamic process. Sorgoleone interferes with several molecular target sites, including photosynthetic electron transport, in in vitro assays. However, the in planta mechanism of action of sorgoleone remains controversial because it is not clear whether this lipid benzoquinone exuding from the roots of sorghum is taken up by roots of the receiving plants and translocated to their foliage where it must enter the chloroplast and inhibit PSII in the thylakoid membrane. Experiments designed to test the in planta mode of action of sorgoleone demonstrated that it has no effect on the photosynthesis of older plants, but inhibits photosynthesis in germinating seedlings. Sorgoleone is not translocated acropetally in older plants, but can be absorbed through the hypocotyl and cotyledonary tissues. Therefore, the mode of action of sorgoleone may be the result of inhibition of photosynthesis in young seedlings in concert with inhibition of its other molecular target sites in older plants. Oxford University Press 2009-05 2009-04-08 /pmc/articles/PMC2682501/ /pubmed/19357432 http://dx.doi.org/10.1093/jxb/erp082 Text en © 2009 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details) |
spellingShingle | Research Papers Dayan, Franck E. Howell, J'Lynn Weidenhamer, Jeffrey D. Dynamic root exudation of sorgoleone and its in planta mechanism of action |
title | Dynamic root exudation of sorgoleone and its in planta mechanism of action |
title_full | Dynamic root exudation of sorgoleone and its in planta mechanism of action |
title_fullStr | Dynamic root exudation of sorgoleone and its in planta mechanism of action |
title_full_unstemmed | Dynamic root exudation of sorgoleone and its in planta mechanism of action |
title_short | Dynamic root exudation of sorgoleone and its in planta mechanism of action |
title_sort | dynamic root exudation of sorgoleone and its in planta mechanism of action |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2682501/ https://www.ncbi.nlm.nih.gov/pubmed/19357432 http://dx.doi.org/10.1093/jxb/erp082 |
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