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New roles for the Arabidopsis TAO1 gene besides disease resistance

New roles for the Arabidopsis TAO1 gene besides disease resistance Target of AvrB Operation (TAO1) is a TIR-NB-LRR disease resistance protein that responds to avirulence gene B (avrB). However, whether TAO1 plays a role in Arabidopsis thaliana development and/or abiotic stress is unknown. Here, we found that TAO1 expression is regulated in a tissue-specific manner, and that TAO1 protein is localized to both the plasma membrane and chloroplasts. Moreover, we showed that three tao1 T-DNA insertion mutants had no significant abnormal phenotype. However, we found that TAO1 expression was up-regulated by ethylene precursor ACC and auxin NAA, but down-regulated by ethylene inhibitor AgNO3 and auxin inhibitor NPA, suggesting that TAO1 is coordinately regulated by ethylene and auxin. We also found that endogenous ethylene production decreased in TAO1-overexpression lines, but increased in the tao1-10 T-DNA mutant line compared to the wild type, suggesting that TAO1 may be a negative regulator of ethylene signaling. These novel characteristics shed new light on the role(s) of TAO1 in Arabidopsis independent of its role in disease resistance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

New roles for the Arabidopsis TAO1 gene besides disease resistance

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References (26)

Publisher
Springer Journals
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
DOI
10.1134/S1021443715040196
Publisher site
See Article on Publisher Site

Abstract

Target of AvrB Operation (TAO1) is a TIR-NB-LRR disease resistance protein that responds to avirulence gene B (avrB). However, whether TAO1 plays a role in Arabidopsis thaliana development and/or abiotic stress is unknown. Here, we found that TAO1 expression is regulated in a tissue-specific manner, and that TAO1 protein is localized to both the plasma membrane and chloroplasts. Moreover, we showed that three tao1 T-DNA insertion mutants had no significant abnormal phenotype. However, we found that TAO1 expression was up-regulated by ethylene precursor ACC and auxin NAA, but down-regulated by ethylene inhibitor AgNO3 and auxin inhibitor NPA, suggesting that TAO1 is coordinately regulated by ethylene and auxin. We also found that endogenous ethylene production decreased in TAO1-overexpression lines, but increased in the tao1-10 T-DNA mutant line compared to the wild type, suggesting that TAO1 may be a negative regulator of ethylene signaling. These novel characteristics shed new light on the role(s) of TAO1 in Arabidopsis independent of its role in disease resistance.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Jun 17, 2015

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