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AtOZF1 positively regulates JA signaling and SA-JA cross-talk in Arabidopsis thaliana

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Abstract

Plant hormones regulate growth, development, and defense against biotic and abiotic stresses. Salicylic acid (SA), ethylene (ET), and jasmonate (JA) are major phytohormones that control the defense against pathogens. SA and JA primarily regulate resistance against biotrophic and necrotrophic pathogens, respectively. NPR1 is the key regulator of SA signaling in plants. AtOZF1 function has recently been ascribed to promote both NPR1- dependent and -independent SA signaling. However, the role of AtOZF1 in JA signaling was not known. Here we report AtOZF1 as a positive regulator of JA signaling in Arabidopsis. The atozf1 mutants are more susceptible to the necrotrophic pathogen Botrytis cinerea than wildtype (WT) plants. AtOZF1 positively regulates the expression of JA inducible genes like PDF1.2, VSP2, THI2.1, and ORA59. AtOZF1 takes part in SA-JA cross-talk to an extent similar to that of NPR1. AtOZF1 is essential for the activation of PDF1.2 expression upon exogenous methyl-jasmonate (MeJA) application. Intriguingly, SA can significantly promote MeJA-induced PDF1.2 expression in the absence of AtOZF1. Altogether our results reveal a novel SA-JA interaction pathway in plants.

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Acknowledgements

This work is supported by the CSIR research grant (38(1515)/21/EMR-II) to AKN. NS acknowledges the fellowship UGC. The authors acknowledge infrastructural support from the Advanced Instrumentation Research Facility and Common Instrument Facility, and DST FIST-II grant of JNU

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Authors and Affiliations

  1. School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110 067, India

    Nidhi Singh & Ashis Kumar Nandi

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  1. Nidhi Singh
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  2. Ashis Kumar Nandi
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Correspondence to Ashis Kumar Nandi.

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Communicated by Manchikatla Venkat Rajam.

Corresponding editor: Manchikatla Venkat Rajam

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Singh, N., Nandi, A.K. AtOZF1 positively regulates JA signaling and SA-JA cross-talk in Arabidopsis thaliana. J Biosci 47, 8 (2022). https://doi.org/10.1007/s12038-021-00243-6

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