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Journal of Integrative Agriculture  2014, Vol. 13 Issue (9): 1900-1908    DOI: 10.1016/S2095-3119(13)60518-3
Physiology·Biochemistry·Cultivation·Tillage Advanced Online Publication | Current Issue | Archive | Adv Search |
Transcriptional Regulation of Expression of the Maize Aldehyde Dehydrogenase 7 Gene (ZmALDH7B6) in Response to Abiotic Stresses
 AN Xia, DUAN Feng-ying, GUO Song, CHEN Fan-jun, YUAN Li-xing , GU Ri-liang
Department of Plant Nutrition, Center for Resources, Environment and Food Security, China Agricultural University, Beijing 100193, P.R.China
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摘要  Aldehyde dehydrogenases (ALDHs) represent a large protein family, which includes several members that catalyze the oxidation of an aldehyde to its corresponding carboxylic acid in plants. Genes encoding members of the ALDH7 subfamily have been suggested to play important roles in various stress adaptations in plants. In this study, quantitative RT-PCR analysis revealed that a maize ALDH7 subfamily member (ZmALDH7B6) was constitutively expressed in various organs, including roots, leaves, immature ears, tassels, and developing seeds. The abundance of ZmALDH7B6 mRNA transcripts in maize roots was increased by ammonium, NaCl, and mannitol treatments. To further analyze tissue-specific and stress-induced expression patterns, the 1.5-kb 5´-flanking ZmALDH7B6 promoter region was fused to the β-glucuronidase (GUS) reporter gene and introduced into maize plants. In roots of independent transgenic lines, there was significant induction of GUS activity in response to ammonium supply, confirming ammonium-dependent expression of ZmALDH7B6 at the transcript level. Histochemical staining showed that GUS activity driven by the ZmALDH7B6 promoter was mainly localized in the vascular tissues of maize roots. These results suggested that ZmALDH7B6 is induced by multiple environmental stresses in maize roots, and may play a role in detoxifying aldehydes, particularly in vascular tissue.

Abstract  Aldehyde dehydrogenases (ALDHs) represent a large protein family, which includes several members that catalyze the oxidation of an aldehyde to its corresponding carboxylic acid in plants. Genes encoding members of the ALDH7 subfamily have been suggested to play important roles in various stress adaptations in plants. In this study, quantitative RT-PCR analysis revealed that a maize ALDH7 subfamily member (ZmALDH7B6) was constitutively expressed in various organs, including roots, leaves, immature ears, tassels, and developing seeds. The abundance of ZmALDH7B6 mRNA transcripts in maize roots was increased by ammonium, NaCl, and mannitol treatments. To further analyze tissue-specific and stress-induced expression patterns, the 1.5-kb 5´-flanking ZmALDH7B6 promoter region was fused to the β-glucuronidase (GUS) reporter gene and introduced into maize plants. In roots of independent transgenic lines, there was significant induction of GUS activity in response to ammonium supply, confirming ammonium-dependent expression of ZmALDH7B6 at the transcript level. Histochemical staining showed that GUS activity driven by the ZmALDH7B6 promoter was mainly localized in the vascular tissues of maize roots. These results suggested that ZmALDH7B6 is induced by multiple environmental stresses in maize roots, and may play a role in detoxifying aldehydes, particularly in vascular tissue.
Keywords:  abiotic stress       aldehyde dehydrogenase       gene expression       promoter       transgenic maize  
Received: 15 March 2013   Accepted:
Fund: 

This work was financially supported by the National 863 Program of China (2012AA100306), the National 973 Program of China (2011CB100305), the National Natural Science Foundation of China (30971863, 31121062), and the Ministry of Agriculture of China (2011ZX08003-005).

Corresponding Authors:  GU Ri-liang, Tel: +86-10-62734424, Fax: +86-10-62731016, E-mail: rilianggu@cau.edu.cn     E-mail:  rilianggu@cau.edu.cn
About author:  AN Xia, E-mail: anxia0217@163.com

Cite this article: 

AN Xia, DUAN Feng-ying, GUO Song, CHEN Fan-jun, YUAN Li-xing , GU Ri-liang. 2014. Transcriptional Regulation of Expression of the Maize Aldehyde Dehydrogenase 7 Gene (ZmALDH7B6) in Response to Abiotic Stresses. Journal of Integrative Agriculture, 13(9): 1900-1908.

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