Characterization of rue extract and its potential for controlling rice blast.

The objective of this work was to purify and standardize the rue ( Ruta graveolens ) extract and evaluate its effect on Magnaporthe oryzae as an alternative to the integrated management of rice blast. The drug was characterized, the liquid extract was obtained, and the methodology for quantifying the standard markers psoralen and bergapten was validated. Rue extract and the markers, solely or in combination, were assayed in vitro, as well as in greenhouse conditions, for their ability to suppress leaf blast, by the evaluation of mycelial growth, conidial germination, and appressorium formation. Rue extract inhibited M. oryzae mycelial growth (100%), conidial germination (LD 50 =0.237 mg), and the appressorium formation (LD 50 =0.121 mg); besides, the extract reduced leaf blast severity by 80.84%. Fluorescence microscopy showed that rue extract did not damage M. oryzae cell wall and plasma membrane, indicating another mode of action. Rue extract has a great potential for controlling rice leaf blast.

• Publication year

  2015

• Venue

  Pesquisa Agropecuaria Brasileira

• Publication date

  2015-12-23

• Fields of study

  Agricultural and Food Sciences, Biology

• Identifiers
  DOI 10.1590/S0100-204X2015001200001
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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