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Assessing the potential phytotoxic and insecticidal extracts of Lyngbya majuscula Gomont and Nitella furcata

Grant number: 13/09994-9
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2013
Effective date (End): August 31, 2014
Field of knowledge:Biological Sciences - Botany - Applied Botany
Principal Investigator:Regildo Márcio Gonçalves da Silva
Grantee:Aníbal Reinaldo de Andrade
Host Institution: Faculdade de Ciências e Letras (FCL-ASSIS). Universidade Estadual Paulista (UNESP). Campus de Assis. Assis , SP, Brazil


Allelopathy is a mechanism of biochemical interactions between organisms, considered a form of adaptation chemistry. In this phenomenon, biomolecules produced by a particular species are released into the environment and influence the growth and development of other organisms. The objective of this study is to evaluate the phytotoxic potential of Lyngbya majuscula and Nitella furcate extracts through bioassays pre and post-emergence, to investigate the possible influence of these on genetic material (mitotic index) in roots of Allium cepa test and evaluate also insecticidal activity against Sitophilus zeamais. The goal here is also to evaluate and quantify the potential antioxidant, phenolics, and flavonoid content extracts. For both bioassays (pre and post-emergence tests) and insecticides will be conducted in the laboratory, seeds, and seedlings of Lactuca sativa will be treated with the extracts of L. majuscula and N. furcata (in concentrations 5, 10, and 20 mg.mL-1 ), and a negative control (water). Already in evaluating insecticide, the extracts will be administered by topical application in corn seeds that will be offered to adult insects S. zeamais concentrations 5, 10, and 20 mg.mL-1 for the control group, and the seeds are sprayed with distilled water. The determination of the phytotoxic action of the extract is evaluated by means of the mitotic index. The antioxidant activity and the determination of phenols and flavonoids in these extracts by spectrophotometric. Therefore the investigation and determination of compounds with allelopathic potential is of paramount importance for a better understanding of the ecological interactions between organisms in a given environment, but also for possible production of herbicide and/or natural insecticide. (AU)

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