Light and temperature regulated terpene biosynthesis: hepatoprotective monoterpene picroside accumulation in Picrorhiza kurrooa |
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Authors: | Tabasum Kawoosa Harsharan Singh Amit Kumar Sunil Kumar Sharma Kiran Devi Som Dutt Surender Kumar Vats Madhu Sharma Paramvir Singh Ahuja Sanjay Kumar |
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Institution: | (1) Biotechnology Division, Institute of Himalayan Bioresource Technology (CSIR), P.O. Box No. 6, Palampur, 176061, Himachal Pradesh, India;(2) Biodiversity Division, Institute of Himalayan Bioresource Technology (CSIR), P.O. Box No. 6, Palampur, 176061, Himachal Pradesh, India;(3) Present address: Biotechnology Division, Lyallpur Khalsa College, Jalandhar, Punjab, India;(4) Present address: Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education and Research, Chandigarh, India;(5) Present address: Biotechnology Division, Jaypee University of Information Technology, Waknaghat, Distt., Solan, Himachal Pradesh, India |
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Abstract: | Picrorhiza (Picrorhiza kurrooa) is an endangered medicinal plant with well-known hepatoprotective activity attributed to monoterpenoid picrosides. The present
article details on regulatory genes of terpenoid metabolism, 3-hydroxy-3-methylglutaryl coenzyme A reductase (pkhmgr) and 1-deoxy-D-xylulose-5-phosphate synthase (pkdxs) from picrorhiza. Since no molecular information was available, these genes were cloned to full-length by degenerate primers
and rapid amplification of cDNA ends, followed by cloning of the upstream sequences that showed the presence of core sequences
for light and temperature responsiveness. Electrophoretic mobility shift assay confirmed binding of protein to these motifs.
Expression of pkhmgr and pkdxs was up-regulated at 15°C as compared to at 25°C as well as under light as compared to dark conditions. Picrosides content
exhibited the trend similar to gene expression. To rule out the possible limitation of carbon pool under dark condition, plantlets
of picrorhiza were raised in vitro in Murashige and Skoog medium supplemented with 3% sucrose. Results showed similar up-regulation
of both the genes and the higher picrosides content in in vitro raised plantlets in the presence of light. Data suggested
the important roles played by light and temperature in regulating pkhmgr and pkdxs, and the picrosides level in picrorhiza. |
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