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Compatibility of Inherent Fungal Endophytes of Withania somnifera with Trichoderma viride and its Impact on Plant Growth and Withanolide Content

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Abstract

Withania somnifera (Ashwagandha), also known as Indian ginseng, is an important ancient medicinal plant, used in the Indian traditional systems of medicine. In view of increasing demand for roots of Ashwagandha, the present study was undertaken to investigate the compatibility of inherent fungal endophytes along with the biocontrol agent, Trichoderma viride, for enhancing W. somnifera plant growth and root secondary metabolites (withaferin A). It has frequently been emphasized by the World Health Organization the use of healthy roots of Ashwagandha for therapeutic applications. To maintain quality of W. somnifera roots, an option could be eco-friendly management of root-knot diseases and co-inoculation of native endophytes along with T. viride. The in vitro antagonistic activity of T. viride (TV) against the W. somnifera pathogens, Alternaria alternata and Sclerotium rolfsii, showed 64.3% and 69.5% growth inhibition, respectively. Here, we investigated the compatibility of TV along with the native endophytic fungi Aspergillus terreus strain 2aWF (2aWF), Penicillium oxalicum strain 5aWF (5aWF), and Sarocladium kiliense strain 10aWF (10aWF) for the cultivation of W. somnifera. The co-inoculation of TV and native endophytic fungi resulted in increased shoot, root weight, and plant height to 65–150%, 35–74.5%, and 15–35%, respectively, compared to untreated plants. Withanolide A content in leaves of TV-treated plants increased significantly by 260%, whereas in co-inoculation treatments, it was enhanced up to 109–242%. However, no considerable change was noticed with withaferin A content in leaves, except the 2aWF + TV treatment significantly increased by 27%. In contrast, withanolide A content in roots was not affected by TV alone but co-inoculation with endophyte treatments significantly increased its content (19–73%). TV alone had increased chlorophyll a by 23%; however, in combination treatments, it increased up to 115–164% compared to control. Besides secondary metabolites in roots and leaves, co-inoculation of TV and native endophytes modulated the expression of the withanolide biosynthetic pathway genes HMGR, DXR, FPPS, SQS, SQE, CAS, SMT1, STE1, and CYP710A1 compared to control treatments. Apart from withanolide biosynthetic pathway genes, co-inoculation of TV also ameliorated the host-resistant-related gene NPR1 which was upregulated by ninefold in the TV treatment and 3- to 7-fold in the combination treatment. Overall, our results show that co-inoculation of TV along with inherent endophytes of W. somnifera enhanced plant growth and withanolides accumulation.

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Acknowledgements

This work was supported by NWP BSC0117 (XII Five Year Plan Network Project) from the Council of Scientific and Industrial Research (CSIR), India. Authors express sincere thanks to the Director, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India for his support and encouragement. RKK acknowledges Indian Council of Medical Research (ICMR), India, for financial assistance in the form of fellowship and contingency grant for research activity. CIMAP Publication Communication Number: CIMAP/PUB/2018/35.

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  1. CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, GKVK Post, Allalasandra, Bangalore, Karnataka, 560 065, India

    Ramesh Kumar Kushwaha, D. K. Venkata Rao, Dinesh A. Nagegowda & Chikkarasanahalli Shivegowda Vivek Babu

  2. Microbial Technology Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, 226 015, India

    Sucheta Singh, Shiv Shanker Pandey & Alok Kalra

  3. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India

    Ramesh Kumar Kushwaha, Sucheta Singh, D. K. Venkata Rao, Dinesh A. Nagegowda, Alok Kalra & Chikkarasanahalli Shivegowda Vivek Babu

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  1. Ramesh Kumar Kushwaha
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Kushwaha, R.K., Singh, S., Pandey, S.S. et al. Compatibility of Inherent Fungal Endophytes of Withania somnifera with Trichoderma viride and its Impact on Plant Growth and Withanolide Content. J Plant Growth Regul 38, 1228–1242 (2019). https://doi.org/10.1007/s00344-019-09928-7

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