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Assessment of allelopathic potential of Bidens sulphurea

Grant number: 13/27140-7
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2014
Effective date (End): November 30, 2016
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Pedro Luis da Costa Aguiar Alves
Grantee:Bruna Pires da Silva
Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil


Bidens sulphurea (Cav.) Sch. Bip is a species that was introduced in Brazil as an ornamental plant and it has become a weed, with a highly invasive capacity on crops of agricultural interest, probably due to its allelopathic effects, and it can suppress the growth of other weeds. This characteristic makes it a potential candidate for obtaining natural herbicides - allelochemicals - which, when isolated and characterized, can be used directly as herbicides or for the semi-synthesis of new compounds. In this sense, the present study aims to evaluate and characterize the allelopathic potential of the species B. sulphurea, as well as, extract, fractionate and isolate the phytochemical promoter of allelopathic effect. Allelopathic potential of B. sulphurea will be characterized by decomposition method and root exudation ("in vivo" plant). The extracts will be made with water and organic solvents separately, and will be applied in different concentrations on test plants (lettuce, tomato, radish, canary seed, onion and wheat) and target plants (signal-grass and guinea-grass), grown in a germination chamber to verify their allelopathic potential. The most active extracts will be divided according to proper techniques of chromatography and the fractions will be tested through the bioassays. The bioactive fractions will be analyzed by HPLC-UV-MS and nuclear magnetic resonance (NMR) to identify the substances in them. It will be performed tests for the comparison of means, and regression analysis with the data obtained.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DA SILVA, BRUNA P.; NEPOMUCENO, MARILUCE P.; VARELA, ROSA M.; TORRES, ASCENSION; MOLINILLO, JOSE M. G.; ALVES, PEDRO L. C. A.; MACIAS, FRANCISCO A.. Phytotoxicity Study on Bidens sulphurea Sch Bip. as a Preliminary Approach for Weed Control. Journal of Agricultural and Food Chemistry, v. 65, n. 25, p. 5161-5172, . (13/27140-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SILVA, Bruna Pires da. Allelopathic potential of Cosmos sulphureus Cav.. 2017. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.

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