Genetic and phenotypic diversity of Sclerotium rolfsii Sacc. in groundnut fields in central Vietnam

N.C. Le, R. Mendes, M. Kruijt, J. Raaijmakers

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

Groundnut (Arachis hypogaea L.) is an economically important legume crop in Vietnam and many other countries worldwide. Stem and pod rot, caused by the soil-borne fungus Sclerotium rolfsii Sacc., is a major yield limiting factor in groundnut cultivation. To develop sustainable measures to control this disease, fundamental knowledge of the epidemiology and diversity of S. rolfsii populations is essential. In this study, disease incidence was monitored in eight groundnut areas in central Vietnam with a total of 240 observational field plots. The results showed that 5-25% of the field-grown groundnut plants were infected by S. rolfsii. Based on ITS-rDNA sequence analyses, three distinct groups were identified among a total of 103 randomly selected S. rolfsii field isolates, with the majority of the isolates (n=90) in one ITS group. S. rolfsii isolates originating from groundnut, tomato and taro were all pathogenic on groundnut and relatively sensitive to the fungicide tebuconazole, but displayed substantial diversity of various genetic and phenotypic traits including mycelial compatibility, growth rate, and sclerotial characteristics.
Original languageEnglish
Pages (from-to)389-397
JournalPlant Disease
Volume96
Issue number3
DOIs
Publication statusPublished - 2012

Keywords

  • teleomorph athelia-rolfsii
  • stem rot
  • mycelial compatibility
  • comparative growth
  • peanut cultivars
  • 1st report
  • pentachloronitrobenzene
  • incompatibility
  • tebuconazole
  • variability

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