Abstract
Arbuscular mycorrhiza is a symbiotic association formed between plant roots and soil borne fungi that alter and at times improve the production of secondary metabolites. Detailed information is available on mycorrhizal development and its influence on plants grown under various edapho-climatic conditions, however, very little is known about their influence on transformed roots that are rich reserves of secondary metabolites. This raises the question of how mycorrhizal colonization progresses in transformed roots grown in vitro and whether the mycorrhizal fungus presence influences the production of secondary metabolites. To fully understand mycorrhizal ontogenesis and its effect on root morphology, root biomass, total phenolics, rosmarinic acid, caffeic acid and antioxidant production under in vitro conditions, a co-culture was developed between three Agrobacterium rhizogenes-derived, elite-transformed root lines of Ocimum basilicum and Rhizophagus irregularis. We found that mycorrhizal ontogenesis in transformed roots was similar to mycorrhizal roots obtained from an in planta system. Mycorrhizal establishment was also found to be transformed root line-specific. Colonization of transformed roots increased the concentration of rosmarinic acid, caffeic acid and antioxidant production while no effect was observed on root morphological traits and biomass. Enhancement of total phenolics and rosmarinic acid in the three mycorrhizal transformed root lines was found to be transformed root line-specific and age dependent. We reveal the potential of R. irregularis as a biotic elicitor in vitro and propose its incorporation into commercial in vitro secondary metabolite production via transformed roots.
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Acknowledgments
Infrastructure support and financial assistance provided by TERI, India and Deakin University, Australia is duly acknowledged. Deakin University provided a post graduate scholarship to SS. Technical assistance provided by Ms Priyanka Gupta, Ms Shikha Choudhary and Ms Deep Rajni for CLSM, SEM and HPLC analysis is highly acknowledged. We are highly thankful to Dr Prakashkiran S Pawar for his support during statistical analysis of the data.
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Fig. S1
Mycorrhizal structures formed in an in planta system. (DOC 3.82 MB)
Fig. S2
HPLC chromatogram of mycorrhizal root extract of HR 4 (DOC 35.5 KB)
Table S1
One-way ANOVA results showing F, P and Levene’s values for all three transformed root lines for all parameters (DOC 62.0 KB)
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Srivastava, S., Conlan, X.A., Cahill, D.M. et al. Rhizophagus irregularis as an elicitor of rosmarinic acid and antioxidant production by transformed roots of Ocimum basilicum in an in vitro co-culture system. Mycorrhiza 26, 919–930 (2016). https://doi.org/10.1007/s00572-016-0721-4
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DOI: https://doi.org/10.1007/s00572-016-0721-4