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Overexpression of a wheat Na+/H+ antiporter gene (TaNHX2) enhances tolerance to salt stress in transgenic tomato plants (Solanum lycopersicum L.)

Overexpression of a wheat Na+/H+ antiporter gene (TaNHX2) enhances tolerance to salt stress in... Soil salinity is a major environmental stress limiting plant productivity. Vacuole Na+/H+ antiporters play important roles for the survival of plants under salt stress conditions. We have developed salt stress tolerant transgenic tomato plants (Solanum lycopersicum cv. PED) by overexpression of the wheat Na+/H+ antiporter gene TaNHX2 using Agrobacterium tumefaciens strain LBA4404 harbouring a binary vector pBin438 that contains the TaNHX2 gene under the control of double CaMV 35S promoter and npt II as a selectable marker. PCR and Southern blot analysis confirmed that TaNHX2 gene has been integrated and expressed in the T1 generation transgenic tomato plants. When TaNHX2 expressing plants were exposed to 100 or 150 mM NaCl, they were found to be more tolerant to salt stress compared to wild type plants. Biochemical analyses also showed that transgenic plants have substantial amount of relative water content and chlorophyll content under salt stress conditions compared to wild type plants. The relative water content in transgenic and wild type plants ranged from 68 to 75 % and 46–73 % and chlorophyll content fall in between 1.8 to 2.4 mg/g fw and 1.0 to 2.4 mg/g fw, respectively, in all stress conditions. In the present study, we observed a better germination rate of T1 transgenic seeds under salt stress conditions compared with wild type plants. Our results indicated that TaNHX2-transgenic tomato plants coped better with salt stress than wild type plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell, Tissue and Organ Culture Springer Journals

Overexpression of a wheat Na+/H+ antiporter gene (TaNHX2) enhances tolerance to salt stress in transgenic tomato plants (Solanum lycopersicum L.)

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References (41)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media B.V.
Subject
Life Sciences; Plant Pathology; Plant Genetics & Genomics; Plant Sciences; Plant Physiology
ISSN
0167-6857
eISSN
1573-5044
DOI
10.1007/s11240-012-0169-y
Publisher site
See Article on Publisher Site

Abstract

Soil salinity is a major environmental stress limiting plant productivity. Vacuole Na+/H+ antiporters play important roles for the survival of plants under salt stress conditions. We have developed salt stress tolerant transgenic tomato plants (Solanum lycopersicum cv. PED) by overexpression of the wheat Na+/H+ antiporter gene TaNHX2 using Agrobacterium tumefaciens strain LBA4404 harbouring a binary vector pBin438 that contains the TaNHX2 gene under the control of double CaMV 35S promoter and npt II as a selectable marker. PCR and Southern blot analysis confirmed that TaNHX2 gene has been integrated and expressed in the T1 generation transgenic tomato plants. When TaNHX2 expressing plants were exposed to 100 or 150 mM NaCl, they were found to be more tolerant to salt stress compared to wild type plants. Biochemical analyses also showed that transgenic plants have substantial amount of relative water content and chlorophyll content under salt stress conditions compared to wild type plants. The relative water content in transgenic and wild type plants ranged from 68 to 75 % and 46–73 % and chlorophyll content fall in between 1.8 to 2.4 mg/g fw and 1.0 to 2.4 mg/g fw, respectively, in all stress conditions. In the present study, we observed a better germination rate of T1 transgenic seeds under salt stress conditions compared with wild type plants. Our results indicated that TaNHX2-transgenic tomato plants coped better with salt stress than wild type plants.

Journal

Plant Cell, Tissue and Organ Culture – Springer Journals

Published: May 5, 2012

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