Plant growth promotion and biological control of Pythium aphanidermatum, a pathogen of cucumber, by endophytic actinomycetes

K. A. El-Tarabily, A. H. Nassar, G. E.St J. Hardy, K. Sivasithamparam

Research output: Contribution to journalArticlepeer-review

198 Citations (Scopus)

Abstract

Aims: To evaluate the potential of Actinoplanes campanulatus, Micromonospora chalcea and Streptomyces spiralis endophytic in cucumber roots, to promote plant growth and to protect seedlings and mature plants of cucumber from diseases caused by Pythium aphanidermatum, under greenhouse conditions. Methods and Results: Three endophytic isolates, out of 29, were selected through tests aimed at understanding their mechanisms of action as biocontrol agents and plant growth promoters. When applied individually or in combination, they significantly promoted plant growth and reduced damping-off and crown and root rot of cucumber. The combination of the three isolates resulted in significantly better suppression of diseases and plant growth promotion, than where the plants were exposed to individual strains. Conclusions: The three selected actinomycete isolates colonized cucumber roots endophytically for 8 weeks, promoted plant growth and suppressed pathogenic activities of P. aphanidermatum on seedling and mature cucumber plants. Significance and Impact of the Study: The results clearly show that the endophytic, glucanase-producing actinomycetes used, especially as a combined treatment, could replace metalaxyl, which is the currently recommended fungicide for Pythium diseases in the United Arab Emirates. These endophytic isolates also have the potential to perform as plant growth promoters, which is a useful attribute for crop production in nutrient impoverished soils.

Original languageEnglish
Pages (from-to)13-26
Number of pages14
JournalJournal of Applied Microbiology
Volume106
Issue number1
DOIs
Publication statusPublished - Jan 2009

Keywords

  • Antagonism
  • Biological fertilizers
  • Microbial interaction
  • Plant growth regulators
  • Soil-borne plant pathogens

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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