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http://dx.doi.org/10.14348/molcells.2018.2320

Identification of the Regulatory Region Responsible for Vascular Tissue-Specific Expression in the Rice Hd3a Promoter  

Pasriga, Richa (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Cho, Lae-Hyeon (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Yoon, Jinmi (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
An, Gynheung (Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University)
Publication Information
Molecules and Cells / v.41, no.4, 2018 , pp. 342-350 More about this Journal
Abstract
Flowering time is determined by florigens. These genes include, Heading date 3a (Hd3a) and Rice FT 1 (RFT1) in rice, which are specifically expressed in the vascular tissues of leaves at the floral transition stage. To study the cis-regulatory elements present in the promoter region of Hd3a, we generated transgenic plants carrying the 1.75-kb promoter fragment of Hd3a that was fused to the ${\beta}$-glucuronidase (GUS) reporter gene. Plants expressing this construct conferred a vascular cell-specific expression pattern for the reporter gene. However, GUS was expressed in leaves at all developmental stages, including the early seedling stage when Hd3a was not detected. Furthermore, the reporter was expressed in roots at all stages. This suggests that the 1.75-kb region lackings cis-elements that regulate leaf-specific expression at the appropriate developmental stages. Deletion analyses of the promoter region indicated that regulatory elements determining vascular cell-specific expression are present in the 200-bp region between -245 bp and -45 bp from the transcription initiation site. By transforming the Hd3a-GUS construct to rice cultivar 'Taichung 65' which is defective in Ehd1, we observed that Ehd1 is the major regulatory element that controls Hd3a promoter activity.
Keywords
${\beta}$-glucuronidase (GUS); cis-elements; Ehd1; Hd3a; promoter; vascular bundle;
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