Abstract
Seaweeds are naturally rich with biological active metabolites that could be promising to be used in the biological control. The present study was conducted to evaluate the antifungal potentiality of metabolites extracted from Ulva fasciata, Ulva lactuca and Cladophora sericea; against Macrophomina phaseolina (Tassi) Goid. and Fusarium oxysporum Schltdl. Four organic solvents hexane, chloroform, acetone and methanol were used for extraction of seaweeds metabolites to assay their biological efficiency on mycelium growth reduction of two candidate soil borne fungal pathogens on potato dextrose agar medium. The highest percentage of F. oxysporum and M. phaseolina growth reduction was observed by acetone extract of U. fasciata and methanol extract of C. sericea. The highest inhibition against M. phaseolina reached up to 28.97% by U. fasciata acetone extract and 24.77% by C. sericea methanol extract. The highest percentage of mycelial growth inhibition of F. oxysporum was observed by U. fasciata acetone extract (23.58%) and C. sericea methanol extract (17.01%). Analysis of acetone extract of U. fasciata by gas chromatography mass spectrophotometer GC/MS revealed the presence of some organic compounds with antifungal properties such as Phenol, 2,2'-methylenebis[6-(1,1-dimethylethyl)-4-methyl-, Di-n-octyl phthalate, 1,2-Benzenedicarboxylic acid, diisodecyl ester, Didecyl phthalate, Phthalic acid, bis (7-methyloctyl) ester, gamma Sitosterol, Cholest-5-en-3-ol, 24-propylidene-, (3. beta.) and Cyclononasiloxane, octadecamethyl-. The results suggest that the studied algal species can be used as potential bio-agent source in biological control of soil borne phytopathogenic fungi.
Highlights
Seaweeds produce a wide range of promising bioactive metabolites that have broad spectrum of biological activities such as antifungal, antibacterial and antioxidant activity
Data of tables 1 and 2 showed that both of phytopathogenic fungal candidates were inhibited by U. fasciata acetone extract and the highest inhibitory effect recorded against M. phaseolina reached up to 28.98%
There is no significant difference between miconazole and acetone extract of U. fasciata in their inhibitory action against M. phaseolina
Summary
Seaweeds produce a wide range of promising bioactive metabolites that have broad spectrum of biological activities such as antifungal, antibacterial and antioxidant activity. Fusarium oxysporum and Macrophomina phaseolina are ubiquitous soil-borne pathogenic fungi that affect the root system of plants or the stem, in some cases developing on upper parts of the plant through transport or growth in the vessels, leading to vascular diseases. Such pathogens can cause economic loss because of plant yield loss [5]. Seaweeds extracts have antifungal activity against soil borne plant pathogenic fungi in addition it can stimulate plant growth [6]. Galal et al, [9] recorded positive antifungal activities of Codium fragile methanol extract against Alternaria alternate, Fusarium oxysporum, Alternaria brassicicola, Ulocladium botrytis and Botryotricum piluliferum
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
