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Fusarium suttonianum Identified as the Causal Agent of Root Rot in Plukenetia volubilis in Peru

Summary

Scientists in Peru discovered that a fungus called Fusarium suttonianum is causing root rot disease in sacha inchi plants, an important crop known for its omega-3 rich seeds. Using both traditional microscopy and modern DNA testing, researchers confirmed this fungus as the culprit and demonstrated it can cause the same disease symptoms in healthy plants. This discovery is important for farmers because it provides the first scientific identification of this disease threat in Peru, enabling the development of better disease prevention and control strategies.

Background

Sacha inchi (Plukenetia volubilis) is a high-value crop rich in omega-3 fatty acids with important nutritional, pharmaceutical, and cosmetic properties. Root rot represents one of the most significant diseases affecting sacha inchi production, causing potential yield losses up to 100%. Despite economic importance, the etiology of root rot in sacha inchi remains poorly documented in Peru.

Objective

To identify the causal agent of root rot in Plukenetia volubilis using morphological observations, molecular characterization, and pathogenicity testing. The study aimed to determine if Fusarium suttonianum was responsible for root rot symptoms observed in sacha inchi plantations in the Picota province of Peru.

Results

The isolated pathogen was identified as Fusarium suttonianum (FSSC 20) through morphological features and molecular analysis showing 99.58% and 99.51% sequence similarity for ITS and TEF-1α respectively. Pathogenicity tests confirmed F. suttonianum induced identical symptoms in inoculated plants, with 100% disease incidence reaching severity grade 3. Koch’s postulates were fulfilled when the pathogen was successfully re-isolated from infected tissues.

Conclusion

This study represents the first report of Fusarium suttonianum causing root rot in Plukenetia volubilis in Peru. The identification provides critical foundation for developing effective disease management strategies and resistance breeding programs. This finding emphasizes the importance of molecular characterization for accurate fungal pathogen identification in sacha inchi production.
  • Published in:Journal of Fungi,
  • Study Type:Experimental Study,
  • Source: 10.3390/jof11090642, PMID: 41003188
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