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Transcriptomic profiling revealed an important role of cell wall remodeling and ethylene signaling pathway during salt acclimation in Arabidopsis

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Abstract

Plants can successfully improve their resistance to previously lethal salinity stress by a short exposure to low levels of salt stress, a process known as salt acclimation (SA). In spite of its fundamental significance in theoretical study and agricultural practice, the molecular mechanisms underlying plant SA remain elusive. In this study, we found that salt acclimated Arabidopsis young seedlings can survive subsequent 200 mM NaCl stress. RNA-seq was performed to analyze the genome-wide transcriptional response under SA conditions. Among 518 differentially expressed genes (DEGs) under SA, 366 up-regulated genes were enriched for cell wall biosynthesis, osmoregulation, oxidative stress, or transcription factors. Seven DEGs participate in the synthesis of lignin and 24 DEGs encode plant cell wall proteins, suggesting the importance of cell wall remodeling under SA. Furthermore, in comparison to non-acclimated salt stress, 228 of 245 DEGs were repressed by acclimated salt stress, including many genes related to ethylene biosynthesis and signaling pathway. In addition, MAPK6, a major component of the ethylene signaling pathway, was found to play a crucial role in SA. Our transcriptomic analysis has provided important insight on the roles of transcription factors, cell wall remodeling, and the ethylene biosynthesis and signaling pathways during SA in Arabidopsis.

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Abbreviations

ACC:

1-Aminocyclopropane-1-carboxylic acid

ACS:

1-Aminocyclopropane-1-carboxylic acid synthase

DEG:

Differentially expressed gene

FDR:

False discovery rate

GO:

Gene ontology

KEGG:

Kyoto encyclopedia of genes and genomes

NASS:

Non-acclimated salt stress

P5CS1:

Pyrroline-5-carboxylate synthase 1

ROS:

Reactive oxygen species

RPKM:

Reads per KB per million reads

SA:

Salt acclimation

SASS:

Salt acclimated salt stress

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Acknowledgments

This study was funded by the National Basic Research Program of China (Grant No. 2012CB114204) and the Foundation for “Taishan Scholar” from the People’s Government of Shandong Province.

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Correspondence to Yanxiu Zhao, Changle Ma or Hui Zhang.

Additional information

Xiaoyan Shen and Zenglan Wang have contributed equally to this work.

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Shen, X., Wang, Z., Song, X. et al. Transcriptomic profiling revealed an important role of cell wall remodeling and ethylene signaling pathway during salt acclimation in Arabidopsis . Plant Mol Biol 86, 303–317 (2014). https://doi.org/10.1007/s11103-014-0230-9

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  • DOI: https://doi.org/10.1007/s11103-014-0230-9

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