Promoter deletion analysis reveals root-specific expression of the alkenal reductase gene (OsAER1) in Oryza sativa
Aniversari Apriana A B , Atmitri Sisharmini B , Hajrial Aswidinnoor A , Kurniawan R. Trijatmiko B C and Sudarsono Sudarsono A CA PMB Lab, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University, Jalan Raya Ciampea, Bogor, Indonesia.
B Indonesian Center for Agricultural Biotechnology and Genetic Resources Research and Development, Jalan Tentara Pelajar 3A, Bogor, Indonesia.
C Corresponding authors. Emails: s_sudarsono@ymail.com; krtrijatmiko@gmail.com
Functional Plant Biology 46(4) 376-391 https://doi.org/10.1071/FP18237
Submitted: 14 September 2018 Accepted: 12 January 2019 Published: 6 February 2019
Abstract
Root-specific promoters are useful in plant genetic engineering, primarily to improve water and nutrient absorption. The aim of this study was to clone and characterise the promoter of the Oryza sativa L. alkenal reductase (OsAER1) gene encoding 2-alkenal reductase, an NADPH-dependent oxidoreductase. Expression analysis using quantitative real-time PCR confirmed the root-specific expression of the OsAER1 gene. Subsequently, a 3082-bp fragment of the OsAER1 promoter was isolated from a local Indonesian rice cultivar, Awan Kuning. Sequencing and further nucleotide sequence analysis of the 3082-bp promoter fragment (PA-5) revealed the presence of at least 10 root-specific cis-regulatory elements putatively responsible for OsAER1 root-specific expression. Using the 3082-bp promoter fragment to drive the expression of the GUS reporter transgene confirmed that the OsAER1 promoter is root-specific. Further, the analysis indicated that OsAER1 promoter activity was absent in leaves, petioles and shoots during sprouting, vegetative, booting and generative stages of rice development. In contrast, the promoter activity was present in anthers and aleurone layers of immature seeds 7–20 days after anthesis. Moreover, there was no promoter activity observed in the aleurone layers of mature seeds. The OsAER1 promoter activity is induced by Al-toxicity, NaCl and submergence stresses, indicating the OsAER1 promoter activity is induced by those stresses. Exogenous treatments of transgenic plants carrying the PA-5 promoter construct with abscisic acid and indoleacetic acid also induced expression of the GUS reporter transgene, indicating the role of plant growth regulators in controlling OsAER1 promoter activity. Promoter deletion analysis was conducted to identify the cis-acting elements of the promoter responsible for controlling root-specific expression. The GUS reporter gene was fused with various deletion fragments of the OsAER1 promoter and the resulting constructs were transformed in rice plants to generate transgenic plants. The results of this analysis indicated that cis-acting elements controlling root-specific expression are located between −1562 to −1026 bp of the OsAER1 CDS. Here we discusses the results of the conducted analyses, the possible role of OsAER1 in rice growth and development, possible contributions and the potential usage of these findings in future plant research.
Additional keywords: cis-acting element, promoter deletion, root-specific expression, tissue-specific expression.
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