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BMC Complementary Medicine and Therapies

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Open Access 01-12-2016 | Research article

Enhancement of Calibrachoa growth, secondary metabolites and bioactivity using seaweed extracts

Authors: Hosam O. Elansary, Jeff Norrie, Hayssam M. Ali, Mohamed Z. M. Salem, Eman A. Mahmoud, Kowiyou Yessoufou

Published in: BMC Complementary Medicine and Therapies | Issue 1/2016

Abstract

Background

Calibrachoa x hybrida (Solanaceae) cultivars are widely used in North and South America as ornamental plants. Their potential as a source of antimicrobial compounds might be enhanced by seaweed extract (SWE) applications.

Methods

SWE of Ascophyllum nodosum were applied at 5 and 7 ml/L as a soil drench or foliar spray on Calibrachoa cultivars of Superbells® ‘Dreamsicle’ (CHSD) and Superbells® ‘Frost Fireʼ (CHSF). The total phenolics, tannins and antioxidants composition as well as specific flavonols in leaf extracts were determined. Further, the chemical composition of SWE was assessed.

Results

The drench and foliar SWE treatments significantly enhanced Calibrachoa cultivars leaf number and area, dry weight, plant height, antioxidant capacity as well as phenolic, flavonols and tannin content. The increased growth and composition of phenols, flavonols and tannins was attributed to the stimulatory effects of SWE mineral composition. The antifungal activity of Calibrachoa cultivars was significantly enhanced following SWE treatments and the minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) were in the range of 0.07–0.31 mg/ml and from 0.16 to 0.56 mg/ml, respectively. Moreover, antibacterial activity was significantly increased and the MIC and minimum bactericidal concentration (MBC) measurements were in the range of 0.06–0.23 mg/ml and from 0.10 to 0.44 mg/ml, respectively. The most sensitive fungus to SWE treatments was C. albicans and the most sensitive bacterium was E. cloacae.

Conclusion

The results suggest that enhanced antifungal and antibacterial activities might be attributed to significant increases of phenolic, flavonols and tannin contents, which ultimately enhance the potential of Calibrachoa as a natural source of alternative antibiotics.

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Title: Enhancement of Calibrachoa growth, secondary metabolites and bioactivity using seaweed extracts
Authors: Hosam O. Elansary
Jeff Norrie
Hayssam M. Ali
Mohamed Z. M. Salem
Eman A. Mahmoud
Kowiyou Yessoufou
Publication date: 01-12-2016
Publisher: BioMed Central
Published in: BMC Complementary Medicine and Therapies / Issue 1/2016
Electronic ISSN: 2662-7671
DOI: https://doi.org/10.1186/s12906-016-1332-5

At a glance: The STEP trials

Springer Medicine

Enhancement of Calibrachoa growth, secondary metabolites and bioactivity using seaweed extracts

Abstract

Background

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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