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Antifungal Compound Isolated from Catharanthus roseus L. (Pink) for Biological Control of Root Rot Rubber Diseases
R Zahari1, N Halimoon2, M F Ahmad3
1Laboratory of Sustainable Bioresource Management (BIOREM), Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, Serdang, Selangor, Malaysia.
Abstract:
Rigidoporus microporus, Ganoderma philippii, and Phellinus noxius are root rot rubber diseases and these fungi should be kept under control with environmentally safe compounds from the plant sources. Thus, an antifungal compound isolated from Catharanthus roseus was screened for its effectiveness in controlling the growth of these fungi. The antifungal compound isolated from C. roseus extract was determined through thin layer chromatography (TLC) and nuclear magnetic resonance (NMR) analysis. Each C. roseus of the DCM extracts was marked as CRD1, CRD2, CRD3, CRD4, CRD5, CRD6, and CRD7, respectively. TLC results showed that all of the C. roseus extracts peaked with red colour at Rf = 0.61 at 366 nm wavelength, except for CRD7. The CRD4 extract was found to be the most effective against R. microporus and G. philippii with inhibition zones of 3.5 and 1.9 mm, respectively, compared to that of other extracts. These extracts, however, were not effective against P. noxius. The CRD4 extract contained ursolic acid that was detected by NMR analysis and the compound could be developed as a biocontrol agent for controlling R. microporus and G. philippii. Moreover, little or no research has been done to study the effectiveness of C. roseus in controlling these fungi.
Insights
Catharanthus roseus extract shows promise in controlling rubber root rot fungi. The CRD4 extract, containing ursolic acid, effectively inhibited Rigidoporus microporus and Ganoderma philippii, suggesting potential as a biocontrol agent.
Area of Science:
- Agricultural Science
- Mycology
- Plant Chemistry
Background:
- Root rot diseases caused by fungi like Rigidoporus microporus, Ganoderma philippii, and Phellinus noxius pose significant threats to rubber plantations.
- Environmentally safe, plant-derived compounds are sought for sustainable disease management.
Purpose of the Study:
- To investigate the antifungal efficacy of compounds isolated from Catharanthus roseus against key rubber root rot fungi.
- To identify the specific compound responsible for antifungal activity and assess its potential as a biocontrol agent.
Main Methods:
- Extraction of antifungal compounds from Catharanthus roseus using dichloromethane (DCM).
- Thin Layer Chromatography (TLC) for separation and visualization of compounds.
- Nuclear Magnetic Resonance (NMR) spectroscopy for structural identification.
- In vitro screening of extracts against Rigidoporus microporus, Ganoderma philippii, and Phellinus noxius.
Main Results:
- Catharanthus roseus extracts showed varying levels of antifungal activity.
- The CRD4 extract demonstrated the highest efficacy against Rigidoporus microporus (3.5 mm inhibition zone) and Ganoderma philippii (1.9 mm inhibition zone).
- NMR analysis identified ursolic acid in the CRD4 extract; however, none of the extracts were effective against Phellinus noxius.
Conclusions:
- Ursolic acid from Catharanthus roseus exhibits potential as a biocontrol agent against Rigidoporus microporus and Ganoderma philippii.
- Further research is warranted to explore the full potential of Catharanthus roseus extracts in managing rubber root rot diseases, particularly against Phellinus noxius.
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