NDLI: Molecular cloning and expression of a vacuolar Na$^{+}$/H$^{+}$ antiporter gene (AgNHX1) in fig (Ficus carica L.) under salt stress

Content Provider	Springer Nature Link
Author	Metwali, Ehab M. R. Soliman, Hemaid I. A. Fuller, M. P. Al Zahrani, H. S. Howladar, S. M.
Copyright Year	2015
Abstract	Soil salinity can be a major limiting factor for productivity in agriculture and forestry and in order to fully utilize saline lands productively in plantation forestry for fig production, the genetic modification of tree species for salt tolerance may be required. Na$^{+}$/H$^{+}$ antiporters have been suggested to play important roles in salt tolerance in plants. Here, we isolated AgNHX1 a vacuolar Na$^{+}$/H$^{+}$ antiporter from a halophytic species Atriplex gmelini and introduced it into fig (Ficus carica L.) cv. Black Mission via Agrobacterium-mediated transformation. Leaf discs explants of fig were co-cultivated for 2 days with Agrobacterium tumefaciens strain LBA 4404 harboring the binary vector pBI121 containing the AgNHX1 gene and the hpt selectable marker gene which encodes hygromycin phosphotransferase. Explants were cultured on MS medium containing 30 mg L$^{−1}$ hygromycin, 3 % sucrose, 0.2 mg L$^{−1}$ kinetin and 2.0 mg L$^{−1}$ 2,4-dichlorophenoxyacetic acid solidified with 2.5 g L$^{−1}$ phytagel in darkness for callus formation. The calli were cultured on MS medium containing 2.0 mg L$^{−1}$ zeatin riboside in combination with 0.4 mg L$^{−1}$ indole acetic acid in the light for plant regeneration. Putative regenerated transformant shoots were confirmed by polymerase chain reaction (PCR) and Southern hybridization for the AgNHX1 gene. Reverse transcriptase polymerase chain reaction analysis indicated that the gene was highly expressed in transgenic plants, but the degree of this expression varied among transformants. Overexpression of the AgNHX1 gene conferred high tolerance to salt stress and transgenic fig plants overexpressing AgNHX1 developed normally under salinity conditions compared to those of non-transgenic plants. Salt treated transgenic plants contained high proline and K$^{+}$ but less Na$^{+}$ compared to non-transgenic control plants.
Starting Page	377
Ending Page	387
Page Count	11
File Format	PDF
ISSN	01676857
Journal	Plant Cell, Tissue and Organ Culture (PCTOC)
Volume Number	123
Issue Number	2
e-ISSN	15735044
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-08-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agrobacterium tumefaciens AgNHX1 antiporter gene Fig (Ficus carica L.) RT-PCR Southern blot hybridization Transformation Plant Sciences Plant Physiology Plant Genetics & Genomics Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Horticulture

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