Transgenic alfalfa plants expressing AtNDPK2 exhibit increased growth and tolerance to abiotic stresses

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Title
Transgenic alfalfa plants expressing AtNDPK2 exhibit increased growth and tolerance to abiotic stresses
Author(s)
Z Wang; H Li; Q Ke; Jae Cheol Jeong; Haeng Soon Lee; B Xu; X P Deng; Y P Lim; Sang Soo Kwak
Bibliographic Citation
Plant Physiology and Biochemistry, vol. 84, pp. 67-77
Publication Year
2014
Abstract
In this study, we generated and evaluated transgenic alfalfa plants (Medicago sativa L. cv. Xinjiang Daye) expressing the Arabidopsis nucleoside diphosphate kinase 2 (AtNDPK2) gene under the control of the oxidative stress-inducible SWPA2 promoter (referred to as SN plants) to develop plants with enhanced tolerance to various abiotic stresses. We selected two SN plants (SN4 and SN7) according to the expression levels of AtNDPK2 and the enzyme activity of NDPK in response to methyl viologen (MV)-mediated oxidative stress treatment using leaf discs for further characterization. SN plants showed enhanced tolerance to high temperature, NaCl, and drought stress on the whole-plant level. When the plants were subjected to high temperature treatment (42°C for 24h), the non-transgenic (NT) plants were severely wilted, whereas the SN plants were not affected because they maintained high relative water and chlorophyll contents. The SN plants also showed significantly higher tolerance to 250mM NaCl and water stress treatment than the NT plants. In addition, the SN plants exhibited better plant growth through increased expression of auxin-related indole acetic acid (IAA) genes (MsIAA3, MsIAA5, MsIAA6, MsIAA7, and MsIAA16) under normal growth conditions compared to NT plants. The results suggest that induced overexpression of AtNDPK2 in alfalfa will be useful for increasing biomass production under various abiotic stress conditions
Keyword
AlfalfaAtNDPK2BiomassDrought stressOxidative stressSalt stressSWAP2 promoter
ISSN
0981-9428
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.plaphy.2014.08.025
Type
Article
Appears in Collections:
Jeonbuk Branch Institute > Biological Resource Center > 1. Journal Articles
Division of Biomaterials Research > Plant Systems Engineering Research > 1. Journal Articles
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