A protective role for nitric oxide and salicylic acid for arsenite phytotoxicity in rice (Oryza sativa L.)

Amit Pal Singh, Garima Dixit, Amit Kumar, Seema Mishra, Navin Kumar, Sameer Dixit, Pradyumna Kumar Singh, Sanjay Dwivedi, Prabodh Kumar Trivedi, Vivek Pandey, Om Prakash Dhankher, Gareth J. Norton, Debasis Chakrabarty, Rudra Deo Tripathi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Nitric oxide (NO) and salicylic acid (SA) are important signaling molecules in plant system. In the present study both NO and SA showed a protective role against arsenite (AsIII) stress in rice plants when supplied exogenously. The application of NO and SA alleviated the negative impact of AsIII on plant growth. Nitric oxide supplementation to AsIII treated plants greatly decreased arsenic (As) accumulation in the roots as well as shoots/roots translocation factor. Arsenite exposure in plants decreased the endogenous levels of NO and SA. Exogenous supplementation of SA not only enhanced endogenous level of SA but also the level of NO through enhanced nitrate reductase (NR) activity, whether AsIII was present or not. Exogenously supplied NO decreased the NR activity and level of endogenous NO. Arsenic accumulation was positively correlated with the expression level of OsLsi1, a transporter responsible for AsIII uptake. The endogenous level of NO and SA were positively correlated to each other either when AsIII was present or not. This close relationship indicates that NO and SA work in harmony to modulate the signaling response in AsIII stressed plants.

Original languageEnglish
Pages (from-to)163-173
Number of pages11
JournalPlant Physiology and Biochemistry
Early online date24 Feb 2017
Publication statusPublished - 1 Jun 2017


  • Arsenic
  • Nitric oxide
  • Rice
  • Salicylic acid
  • Transporters


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