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Overexpression of OsVP1 and OsNHX1 Increases Tolerance to Drought and Salinity in Rice

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Abstract

Drought and salinity are major abiotic stresses affecting rice production. To improve plant tolerance to salinity and drought, we overexpressed rice Na+/H+ exchangers (OsNHX1) and H+-pyrophosphatase in tonoplasts (OsVP1) in a japonica elite rice cultivar, Zhonghua 11. Compared with our wild-type control, transgenic plants overexpressing both genes incurred less damage when exposed to long-term treatment with 100 mM NaCl or water deprivation. Under high-saline conditions, the transformants accumulated less Na+ and malondialdehyde in the leaves, thereby allowing the plants to maintain a low level of leaf water potential and reduce stress-induced damage. Those transgenics also had higher photosynthetic activity during the stress period. Under those conditions, they also showed an increase in root biomass, which enabled more water uptake. These results suggest that OsVP1 and OsNHX1 improve the tolerance of rice crops against drought and salt by employing multiple strategies in addition to osmotic regulation.

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Abbreviations

DO:

Double overexpression

NHX1:

Na+/H+ exchanger 1

RWC:

Relative water content

WT:

Wild type

VP (V-PPase):

Vacuolar H+-pyrophosphatase

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Acknowledgments

This work was supported by the National High Technology Research and Development Program (2007AA021403), the Specialized Research Fund for the Doctoral Program of China Higher Education (grant no. 20070335081), and the Research Foundation for Talented Scholars in China Three Gorges University (KJ2009B047).

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Correspondence to Huixia Shou.

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Liu, S., Zheng, L., Xue, Y. et al. Overexpression of OsVP1 and OsNHX1 Increases Tolerance to Drought and Salinity in Rice. J. Plant Biol. 53, 444–452 (2010). https://doi.org/10.1007/s12374-010-9135-6

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  • DOI: https://doi.org/10.1007/s12374-010-9135-6

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