Evaluation of Allelopathic and Antifungal Activity of Selected Seaweeds

International Journal of Applied Chemistry

© 2019 by SSRG - IJAC Journal

Volume 6 Issue 1

Year of Publication : 2019

Authors : A.B.Fathima Rifana

10.14445/23939133/IJAC-V6I1P109

How to Cite?

A.B.Fathima Rifana, "Evaluation of Allelopathic and Antifungal Activity of Selected Seaweeds," SSRG International Journal of Applied Chemistry, vol. 6,  no. 1, pp. 64-67, 2019. Crossref, https://doi.org/10.14445/23939133/IJAC-V6I1P109

Abstract:

Allelopathy refers to the beneficial or harmful effects of one plant on another plant, both crop and weed species, from the release of biochemicals, known as allelochemicals, from plant parts by leaching, root exudation, volatilization, residue decomposition, and other processes in both natural and agricultural systems. Allelochemicals are a subset of secondary metabolites not required for metabolism (growth and development) of the allelopathic organism. Allelochemicals with negative allelopathic effects are an important part of plant defense against herbivory. Most of the plants finding in nature itself new weapons with insecticidal, fungicidal, herbicidal and antiparasiticidal properties. Present investigation initiated with the aim of Allelopathic and Antifungal activity of the selected seaweeds Turbinariaornata and Halimedadiscoidea. In this study leaves of the plants were collected from natural environment, washed, shade dried pulverized and extracted with methanol. A part of Methanol extracts were subjected to Radish seed germination bioassay and the remaining extracts were subjected to antifungal assay. The main objectives of the research work were to identify the maximum inhibitory activity of the seaweeds against the allelochemicals and fungus and check the presence or absence of the phytochemical constituents of the selected seaweed leaves methanolic extract. The preliminary results of the research showed that maximum germination inhibition observed in Turbinariaornata and the antifungal activity profile of two seaweed extracts against fungus showed that methanol extract of Turbinariaornata against Cladosporium and Aspergillus.sp exhibited maximum zone of inhibition of 8.5 mm and 10.2mm respectively. And the results of these species could be used as sources of natural herbicides due to their germination inhibition activity.Turbinariaornata andHalimedadiscoidea leaves were good source for phytochemicals such as steroids, flavonoids and alkaloids. Proceeding qualitative phytochemical screening of these seaweeds may show that steroids were found to be present in the Turbinariaornata and HalimedaDiscoidea leaf methanolic extract.

Keywords:

Allelopathy, Halimedadiscoidea, Turbinariaornata, Antifungal Activity, Zone of Inhibition

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