The phytotoxins of Mycosphaerella fijiensis, the causative agent of Black Sigatoka disease of bananas and plantains

A. A. Stierle, R. Upadhyay, J. Hershenhorn, G. A. Strobel, G. Molina

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Black Sigatoka is the most costly to control disease of bananas and plantains in the world. Currently, a worldwide search is underway either to find or to produce cultivars that are disease-resistant or-tolerant. Phytotoxins isolated from the pathogen might facilitate the discovery of such cultivars. Several aromatic compounds from liquid cultures of Mycosphaerella fijiensis, the causal agent of Black Sigatoka disease of bananas and plantains, have been isolated. The most abundant and phytotoxic of these compounds is 2,4,8-trihydroxytetralone, which induces necrotic lesions at 5 μg/5 μl in less than 12 h on sensitive cultivars of bananas. This compound exhibits host-selectivity that mimics that of the pathogen. Other phytotoxins isolated from this fungus, in lesser amounts, were juglone, the novel compound 2-carboxy-3-hydroxycinnamic acid, isoochracinic acid and 4-hydroxyscytalone. Some of the phytotoxins isolated are melanin shunt pathway metabolites, which makes this fungus unique among plant pathogens.

Original languageEnglish
Pages (from-to)853-859
Number of pages7
JournalExperientia
Volume47
Issue number8
DOIs
StatePublished - Aug 1991

Keywords

  • 2,4,8-trihydroxytetralone
  • Epidemic
  • Sigatoka
  • juglone
  • melanin shunt pathway
  • plant pathogen

Fingerprint

Dive into the research topics of 'The phytotoxins of Mycosphaerella fijiensis, the causative agent of Black Sigatoka disease of bananas and plantains'. Together they form a unique fingerprint.

Cite this