Abstract
Agrobacterium-mediated transformations ensure elevated amounts of secondary metabolite accumulation with genetic and biosynthetic stability. In the present study, Alpinia galanga rich in bioactive compounds was genetically transformed using different strains of Agrobacterium rhizogenes viz. LBA 9402, A(4), 532, 2364 and PRTGus. Even though a higher growth rate was obtained with the LBA 9402 strain, maximum acetoxychavicol acetate accumulation (ACA) was seen in the PRTGus transformant. PRTGus root line has shown 10.1 fold higher ACA content in comparison to the control roots. The lowest ACA production was shown by the A(4) transformant (4.9 fold). The quantification of ACA in the transformed roots was carried out by using HPLC, which was found to be in the order of PRTGus > LBA 9402 > 2364 > 532 > A(4). The fast growth rate of hairy roots, genetic stability and their ability to synthesize more than one metabolite offer a promising system for the production of valuable secondary metabolites.
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