Bioactive chemical constituents produced by endophytes and effects on rice plant growth

Waqas, M. and Khan, A.L. and Lee, I-J. (2013) Bioactive chemical constituents produced by endophytes and effects on rice plant growth. Journal of Plant Interactions. pp. 1-10.

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We investigated the bioactive potential of fungal endophytes isolated from the roots of Glycine max (L.) Merr. and Cucumis sativus. Initial screening results showed that endophytes, (Chrysosporium pseudomerdarium, Aspergillus fumigates and Paecilomyces sp., Penicillium sp., Phoma glomerata, and Paecilomyces formosus) were promoting the growth attributes (shoot length, chlorophyll contents, and biomass) of mutant and wild-type rice. To know whether, these endophytes were producing bioactive chemical constituents; the endophytes were grown in potato dextrose, czapek broth, and ICI mediums that resulted in varying mycelia biomass. The advance chromatographic analysis of endophytic fungal culture filtrate showed gibberellins (GA) production namely GA1 (0.05–10.55 ngml−1), GA3 (0.48–9.0 ngml−1), GA4 (0.2–8.0 ngml−1), GA7 (1.4–6.5 ngml−1), and GA9 (0.03–1.05 ngml−1) while among endophytes, P. glomerata and P. formosus were highly potent in GAs production. Additionally, the endophyte's culture also contained indole-3-acetic acid (0.23–71.51 µgml−1). Furthermore, oxalic (0.009–0.3 mgl−1), quinic (0.019–0.22 mgl−1), malic (1.94–17.2 mgl−1), and citric (0.012–0.95 mgl−1) acids were also present in the endophytic cultures. The biochemical potential of endophytes greatly varied depending on nutrient source and pH, however, czapek broth rich in carbon revealed higher potential for bioactive chemical constituent's production. In conclusion, the current findings suggest that endophyte can play a vital role in essential crop plant growth by synthesizing a wide array of bioactive metabolites. Furthermore, an increased production of chemical constituents can be achieved by changing the in vitro growth conditions of endophytes

Item Type: Article
Additional Information: This study was supported by Korean Ministry of Environment through ‘The Eco-Innovation Project’. This study was supported by Kyungpook National University Research Fund, 2013.
Uncontrolled Keywords: fungal endophytes; nutrient media; gibberellins; IAA; organic acids; pH
Author Affiliation: School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Mr Siva Shankar
Date Deposited: 04 Dec 2013 08:23
Last Modified: 04 Dec 2013 08:23
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