Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 65, Issue -, Pages 61-66Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2013.01.009
Keywords
Arabidopsis; Halophyte; Myo-inositol 1-phosphate synthase; Salt stress; Spartina alterniflora
Categories
Funding
- USDA-NIFA
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Salinity is one of the most important environmental constraints limiting agricultural productivity. Considering the importance of the accumulation of osmolytes, myo-inositol in particular, in halophytic plant's adaptive response to salinity, an effort was made to overexpress the SaINO1 gene from the grass halophyte Spartina alterniflora encoding myo-inositol 1-phosphate synthase (MIPS) in Arabidopsis thaliana. We demonstrated that SaINO1 is a stress-responsive gene and its constitutive over expression in Arabidopsis provides significantly improved tolerance to salt stress during germination and seedling growth and development. The transgenics retained more chlorophyll and carotenoid by protecting the photosystem II. The low level of stress-induced cellular damage in the transgenics was clearly evident by lower accumulation of proline in comparison to WT. Our results indicated that possible over-accumulation of MIPS enzyme in the cytosol protected the transgenic Arabidopsis plants overexpressing SaINO1 from the toxic effect of Na+ under salt stress by reducing cellular damage and chlorophyll loss. (C) 2013 Elsevier Masson SAS. All rights reserved.
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