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Effects of cryptogein gene on growth, phenotype and secondary metabolite accumulation in co-transformed roots and plants of Tylophora indica

Author:
Basu, Amrita, Roychowdhury, Dipasree, Joshi, RajKumar, Jha, Sumita
Source:
Acta physiologiae plantarum 2017 v.39 no.1 pp. 3
ISSN:
0137-5881
Subject:
Rhizobium rhizogenes, Southern blotting, Tylophora indica, amplified fragment length polymorphism, caffeic acid, ferulic acid, genes, genetic similarity, medicinal plants, p-coumaric acid, pathogens, phenotype, roots, secondary metabolites
Abstract:
Tylophora indica, an indigenous medicinal plant, was transformed with the cryptogein gene to determine the effect of crypt gene on secondary metabolites in co-transformed roots and plants via Agrobacterium rhizogenes mediated transformation. The Ri crypt co-transformed roots and plants showed expression of crypt gene. Southern hybridization specifies that crypt gene has been transferred and positively integrated into the Ri crypt co-transformed plant. AFLP fingerprinting revealed high degree of genetic similarity among the Ri-transformed and Ri crypt co-transformed cultures. The expression of crypt gene stimulated phenolic compound accumulation in transformed root and plants while tylophorine content was comparable in Ri transformed and Ri crypt co-transformed root lines and plants. The Ri crypt co-transformed root lines showed significantly higher (p ≤ 0.05) phenolics production (caffeic acid, 1.8–2.9-fold; p-coumaric acid, 1.9-fold and ferulic acid, 1.5–2-fold) compared to Ri-transformed root lines. The roots of Ri crypt co-transformed plants showed a significantly (p ≤ 0.05) higher content of caffeic acid (1.19-fold) and ferulic acid (1.53-fold) than Ri-transformed plants. It is suggested that crypt-transformed plants can also be used as a tool to elucidate the biochemical basis of defense responses as phenolics are known to play a role in providing defense barriers to infection by pathogen.
Agid:
5732112