Inhibition of bacterial and fungal plant pathogens by thionins of types I and II

Molina Fernández, Antonio and Ahl Goy, Patricia and Fraile Pérez, Aurora and Sánchez-Monge Laguna de Rins, Rosa and García Olmedo, Francisco (1993). Inhibition of bacterial and fungal plant pathogens by thionins of types I and II. "Plant Science", v. 92 (n. 2); pp. 169-177. ISSN 0168-9452. https://doi.org/10.1016/0168-9452(93)90203-C.

Description

Title: Inhibition of bacterial and fungal plant pathogens by thionins of types I and II
Author/s:
  • Molina Fernández, Antonio
  • Ahl Goy, Patricia
  • Fraile Pérez, Aurora
  • Sánchez-Monge Laguna de Rins, Rosa
  • García Olmedo, Francisco
Item Type: Article
Título de Revista/Publicación: Plant Science
Date: 1993
ISSN: 0168-9452
Volume: 92
Subjects:
Freetext Keywords: Thionins; Plant pathogens; Triticum aestivum; Hordeum vulgare
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Biotecnologia [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Thionins are cysteine-rich, 5 kDa polypeptides which are active against plant pathogens. Thionins of type I, from the endosperms of wheat (Wα1, Wα2, Wβ) and barley (Bα, Bβ), and of type II, from barley (BLa, BLb, BLc), have been purified to apparent homogeneity. For a given pathogen, the effective concentration giving 50% inhibition (EC-50) determined for the different thionins varied over a less than fivefold range. The ranking of the variants according to their activity differed among different pathogens, but certain variants, such as Wα1, Wβ or Bβ, tended to be more active than the others. Strains of some bacterial species, such as Clavibacter michiganensis subsp. sepedonicus or Pseudomonas solanacearum were sensitive in the 2–3 × 10−7M concentration rangem whereas the most sensitive fungal pathogens, such as Rosellinia necatrix, Colletotrichum lagenarium and Fusarium solani, had EC-50 values in the 1−4 × 10−6M range. Thionins, which were not particularly effective in liquid medium against Phytophthora infestans (EC-50=3.9 × 10−5M) were more effective than the fungicide Ridomil on a molar basis in a drop application assay on leaf discs from potato.

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