alexa Barley HVA1 Gene Confers Drought and Salt Tolerance in Transgenic Maize Zea Mays L.)
ISSN: 2329-8863

Advances in Crop Science and Technology
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Research Article

Barley HVA1 Gene Confers Drought and Salt Tolerance in Transgenic Maize Zea Mays L.)

Thang Xuan Nguyen and Mariam Sticklen*
Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 4882, USA
Corresponding Author : Mariam Sticklen
Department of Plant, Soil and Microbial Sciences
Michigan State University, East Lansing, MI 4882, USA
E-mail: [email protected]
Received Februay 11, 2013; Accepted March 22, 2013; Published March 28, 2013
Citation: Nguyen TX, Sticklen M (2013) Barley HVA1 Gene Confers Drought and Salt Tolerance in Transgenic Maize (Zea Mays L.). Adv Crop Sci Tech 1:105. doi: 10.4172/2329-8863.1000105
Copyright: © 2013 Nguyen TX, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Drought and salt are two major abiotic stress factors resulting in maize seed and biomass yield losses. In an attempt to produce drought and salt tolerant maize plants, rapidly growing embryogenic calli were produced in vitro from maize immature embryos, and bombarded with a gene construct containing the barley HVA1 (Hordeum vulgaris abundant protein) and the Liberty herbicide resistance (bar) genes using the BiolisticTM device (gene gun). The bombarded calli were chemically selected in a regeneration medium containing 2.5 mg/L of glufosinate ammonium (the active ingredient of Liberty herbicide), 1 mg/L of benzyl amino purine (BAP). Plantlets were produced four weeks after calli were transferred into the regeneration medium and incubated under fluorescent light condition of 16 hr light/8 hr dark at 25°C in a growth room. The polymerase chain reaction (PCR) and Southern blot hybridization confirmed the integration, and the reverse transcription PCR (RT-PCR) and Northern blotting confirmed the transcription of the HVA1 transgene, and herbicide treatment confirmed the expression of the bar transgene in upto the fourth generations (T3) of mature plants. The T3 plants that transcribed the HVA1 showed higher leaf relative water content (RWC), higher leaf and root biomass, and survived complete drought for 15 days while the wild-type non-transgenic control plants died. The T3 plants were also tolerant to 100-300 mM NaCl (especially to 200 mM) while the wild-type control non-transgenic plants showed severe damage under these salt treatments. The research presented here might serve as getting one step closer to developing a drought and salt tolerant maize.

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