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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.
Russian Journal of Plant Physiology – Springer Journals
Published: Jun 17, 2015
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