Population Structure and Development of Resistance to Hymexazol Among Fusarium solani Populations from Date Palm, Citrus and Cucumber

Abdullah M. Al-Sadi, Ruqaya S. Al-Masoodi, Majid Al-Ismaili, Issa H. Al-Mahmooli

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A study was conducted to investigate genetic diversity and sensitivity to hymexazol among 80 isolates of Fusarium solani complex obtained from date palm (30), citrus (31) and cucumber (19). Characterization based on sequences of the EF1α and ITS rRNA showed that isolates belong to F. solani complex MLST type 3 + 4. AFLP analysis produced 980 polymorphic loci, 80 AFLP genotypes and moderate levels of genetic diversity (H = 0.2494). Clustering of the isolates was not related to the host or the geographical origin of the isolates. Analysis of molecular variance (amova) indicated the existence of a low level of genetic differentiation among populations obtained from different hosts (Fst = 0.0162) and regions (Fst = 0.0066). This may provide evidence for frequent movement of inoculum among hosts and regions in Oman, which could be attributed to cultural practices employed by farmers. Isolates of F. solani displayed variation in sensitivity to hymexazol, with EC50 values ranging from 2 to 5745 μg/ml (mean = 878 μg/ml); 19% of the isolates have an EC50 value of more than 1000 μg/ml. Findings are discussed in terms of the factors that affect diversity in F. solani isolates. The study reports for the first time the development of resistance to hymexazol among F. solani isolates from date palm, citrus and cucumber.

Original languageEnglish
Pages (from-to)947-955
Number of pages9
JournalJournal of Phytopathology
Volume163
Issue number11-12
DOIs
Publication statusPublished - Dec 1 2015

Fingerprint

hymexazol
Cucumis sativus
Phoenix dactylifera
Fusarium solani
Citrus
Fusarium
cucumbers
population structure
Amplified Fragment Length Polymorphism Analysis
Oman
Population
genetic variation
amplified fragment length polymorphism
Cluster Analysis
Analysis of Variance
Genotype
inoculum
Phoeniceae
ribosomal RNA
farmers

Keywords

  • AFLP fingerprinting
  • Fungicide resistance
  • Phylogenetic analysis

ASJC Scopus subject areas

  • Plant Science
  • Agronomy and Crop Science
  • Physiology
  • Genetics

Cite this

Population Structure and Development of Resistance to Hymexazol Among Fusarium solani Populations from Date Palm, Citrus and Cucumber. / Al-Sadi, Abdullah M.; Al-Masoodi, Ruqaya S.; Al-Ismaili, Majid; Al-Mahmooli, Issa H.

In: Journal of Phytopathology, Vol. 163, No. 11-12, 01.12.2015, p. 947-955.

Research output: Contribution to journalArticle

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