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Environmental Science and Pollution Research

, Volume 26, Issue 11, pp 10537–10551 | Cite as

Overexpression of OsLea14-A improves the tolerance of rice and increases Hg accumulation under diverse stresses

  • Tingzhang HuEmail author
  • Yuanli Liu
  • Shanshan Zhu
  • Juan Qin
  • Wenping Li
  • Nong Zhou
Research Article
  • 674 Downloads

Abstract

The group 5 LEA (late embryogenesis abundant) proteins are an atypical LEA protein group, which is associated with resistance to multiple stresses. In this study, OsLea14-A gene was isolated from Oryza sativa L., which encodes a 5C LEA protein with 151 amino acids. The qPCR analysis showed that OsLea14-A expressed in all tissues and organs at all times. The expression of OsLea14-A in the panicles of plumping stage were dramatically increased. The heterologous expression of OsLea14-A in Escherichia coli improved its growth performance under salinity, desiccation, high temperature, and freeze-thaw stresses. The purified OsLea14-A protein can protect LDH activity from freeze-thaw-, heat-, and desiccation-induced inactivation. The overexpression of OsLea14-A in rice improved tolerance to dehydration, high salinity, CuSO4, and HgCl2, but excluding K2Cr2O7. The analysis of metal contents showed that the accumulation of OsLea14-A protein in transgenic rice could increase the accumulation of Hg, but could not increase the accumulation of Na, Cr, and Cu after HgCl2, NaCl, K2Cr2O7, and CuSO4 treatment, respectively. These results suggested that OsLea14-A conferred multiple stress tolerance and Hg accumulation, which made it a possible gene in genetic improvement for plants to acclimatize itself to multiple stresses and remediate Hg-contaminated soil.

Keywords

Late embryogenesis abundant protein Abiotic stresses Oryza sativa L. Heterologous expression Overexpression Hg accumulation 

Notes

Funding

This work was funded by the Basic and Advanced Research Project of Chongqing CSTC (cstc2018jcyjAX0665) and the Natural Science Foundation Project of Wanzhou District (201403063).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory for Biorheological Science and Technology of Ministry of EducationBioengineering College of Chongqing UniversityChongqingPeople’s Republic of China
  2. 2.College of Food and Biological EngineeringChongqing Three Gorges UniversityChongqingChina

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