Orbital - Vol. 7 No. 3 - July-September 2015

Herbicidal and Plant-growth Stimulating Effects of Phenolic Compounds Isolated from Lichens

Marize Terezinha L. Pereira Peres
Universidade Federal de Mato Grosso do Sul
Ana M. Mapeli
Universidade Federal do Oeste da Bahia
Odival Faccenda
Universidade Estadual de Mato Grosso do Sul
Neli Kika Honda
Universidade Federal de Mato Grosso do Sul
Published September 23, 2015
  • lichen substances,
  • allelopathic activity,
  • Allium cepa,
  • phenolic compounds
How to Cite
Pereira Peres, M. T. L.; Mapeli, A. M.; Faccenda, O.; Honda, N. K. Herbicidal and Plant-Growth Stimulating Effects of Phenolic Compounds Isolated from Lichens. Orbital: Electron. J. Chem. 2015, 7, 275-281.


The depsides atranorin (7) and diffractaic acid (1), the depsidones hypostictic (2) protocetraric (3), salazinic (4) acids, the xanthone secalonic acid (5), and usnic acid (6) were evaluated for their phytotoxic potentials against the target species Allium cepa cv. Baia periforme (onion, Monocotyledoneae). The bioassays, carried out under laboratory conditions, revealed that diffractaic (1) and hypostictic (2) acids stimulated plant growth; secalonic acid (5) stimulated seed germination and radicle growth, while reducing coleoptile length. Usnic acid (6) promoted seed germination and stronger inhibition of radicle and coleoptile growth. Protocetraric (3) and salazinic (4) acids and atranorin (7) exhibited a herbicidal effect, inhibiting seed germination and reducing radicle and coleoptile growth—features that suggest their utility as natural herbicides. These results invite further investigation to elucidate the mode of action of these compounds and to synthesize them for field experiments.

DOI: http://dx.doi.org/10.17807/orbital.v7i3.756