Analysis And Localization of the Water-Deficit Stress-Induced Gene (lp3) |
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Authors: | Jau-Tay Wang Jean H Gould Veera Padmanabhan Ronald J Newton |
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Institution: | (1) Department of Forest Science, Texas A&M University, College Station, 77843 Texas, USA;(2) Transworld Institute of Technology, Toulin 640, Yunlin, Taiwan, Republic of China |
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Abstract: | LP3 is a water-deficit-induced protein, which is highly homologous to ASR (ABA, stress and ripening) proteins. Homology was found in the C-terminal region of the putative LP3 protein while lower homologies were found in the N-terminal region. The goal of this study was to investigate the function of the LP3 protein and the mechanism of the lp3 promoter in response to water-deficit stress (WDS) and other stresses. In regenerated transgenic tobacco (T0), expression of β-glucuronidase (GUS) from the lp3 promoter-GUS construct was observed in polyethylene glycol (PEG), abscisic acid (ABA), methyl-jasmonate (MeJa), and fluridone (Flu) treatments. GUS expression was not observed following gibberellin (GA3), 2-methyl-4-dichlorophenoxy acetic acid (2,4-D), silver nitrate, or ethephon (ethylene releasing agent) treatments. Germinated T1 seedlings containing the lp3 promoter-GUS construct exhibited GUS activity up to 40 days postgermination. Expression could be restored when 5-azacytidine was included in the culture media, indicative of a developmentally regulated silencing mechanism involving methylation. In transgenic tobacco, the LP3 protein localized in the cell nucleus was induced by WDS and appeared to be developmentally regulated. |
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