Suppression of disease in tomato infected by Pythium ultimum with a biosurfactant produced by Pseudomonas koreensis

Sammanfattning

The use of biosurfactants is a promising alternative in biological control of zoospore-producing oomycetes, which are a major plant pathogen world-wide in a wide variety of crops. Oomycetes are of particular concern in closed hydroponic cultivation systems. The present study investigated the efficacy of a biosurfactant produced by Pseudomonas koreensis and added as a crude extract against the oomycete Pythium ultimum in hydroponic tomato cultivation. A significant reduction in disease was observed. Biosurfactant addition did not affect the indigenous root microflora when evaluated as sole carbon source utilisation. Chemical analysis, using electrospray hybrid mass spectrometry (ESI-MSMS), of the biosurfactant indicated it to be lokisin, a cyclic lipopeptide. These results confirm that biosurfactants are important in developing sustainable biological control strategies for oomycetes.

Nyckelord

Biological control; hydroponics; lokisin; oomycetes; Pseudomonas koreensis; Pythium ultimum

Publicerad i

BioControl
2010, volym: 55, nummer: 3, sidor: 435-444
Utgivare: Springer

SLU författare

• Hultberg, Malin

  • Hortikultur, Sveriges lantbruksuniversitet
    

• Khalil, Samar

  • Hortikultur, Sveriges lantbruksuniversitet
    

• Alsanius, Beatrix

  • Hortikultur, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Trädgårdsvetenskap/hortikultur

Publikationens identifierare

• DOI: https://doi.org/10.1007/s10526-009-9261-6

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/29399