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Plant Cell Reports

, Volume 37, Issue 1, pp 61–75 | Cite as

Plant small RNAs: the essential epigenetic regulators of gene expression for salt-stress responses and tolerance

  • Vinay KumarEmail author
  • Tushar Khare
  • Varsha Shriram
  • Shabir H. WaniEmail author
Review

Abstract

Saline environment cues distort the plant growth, development and crop yield. Epigenetics has emerged as one of the prime themes in plant functional genomics for molecular-stress-physiology research, as copious studies have provided new visions into the epigenetic control of stress adaptations. The epigenetic control is associated with the regulation of the expression of stress-related genes which also comprises many steady alterations inherited in next cellular generation as stress memory. These epigenetic amendments also implicate induction of small RNA (sRNA)-mediated fine-tuning of transcriptional and post-transcriptional regulations of gene expression. These tiny (19–24 nt) RNA species, particularly microRNAs (miRNAs) besides endogenous small interfering RNA (siRNA) have emerged as important responsive entities for epigenetic modulation of salt-stress effects on plants. There is a recent upsurge in development of tools and databases useful for prediction, identification and validation of small RNAs (sRNAs) and their target messenger RNAs (mRNAs). Therefore, these small but key regulatory molecules have received a wide attention in post-genomic era as potential targets for engineering stress tolerance in major glycophytic crops, though it is yet to be explored optimally. This review aims to provide critical updates on plant sRNAs as key epigenetic regulators of plant salt-stress responses, their target prediction and validation, computational tools and databases available for plant small RNAs, besides discussing their roles in salt-stress regulatory networks and adaptive mechanisms in plants, with special emphasis on their exploration for engineering salinity tolerance in plants.

Keywords

Salinity stress Epigenetic regulations Non-coding RNAs microRNA Short interfering RNAs Post-transcriptional regulation Stress responses Genetic engineering 

Notes

Acknowledgements

The research in VK’s lab is supported through the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India funds (grant number SR/FT/LS-93/2011 and EMR/2016/003,896). The authors acknowledge the use of facilities created under DST-FIST program and Star College Scheme Department of Biotechnology (DBT), Government of India, implemented at Modern College, Ganeshkhind, Pune.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Department of BiotechnologyModern College of Arts, Science and Commerce (Savitribai Phule Pune University)PuneIndia
  2. 2.Department of Environmental ScienceSavitribai Phule Pune UniversityPuneIndia
  3. 3.Department of BotanyProf. Ramkrishna More College (Savitribai Phule Pune University)PuneIndia
  4. 4.Mountain Research Centre for Field CropsSher-e-Kashmir University of Agricultural Sciences and Technology of KashmirAnantnagIndia
  5. 5.Department of Plant Soil and Microbial SciencesMichigan State UniversityEast LansingUSA

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