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Small Circular Single-stranded DNA Associated with Foliar Decay Disease of Coconut Palm in Vanuatu

Department of Plant Pathology, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064
and¹ I.R.H.O., Saraoutou Oil Crops Research Station, B.P. 89, Espiritu Santo, Vanuatu

The single-stranded DNA previously reported to be associated with foliar decay disease of coconut palm appears to be predominantly circular, on the basis of its behaviour in two-dimensional polyacrylamide gel electrophoresis, electron microscopy, and its resistance to end-labelling following treatment with alkaline phosphatase and polynucleotide kinase. The DNA sedimented at between 12S and 15S and had a contour length for the circular molecules consistent with the predominant DNA having a molecular weight of about 0.43 x 10⁶, and comprising approximately 1300 nucleotides. These properties differ from the genomic DNAs of known plant viruses.

Keywords: FDD, circular ssDNA, coconut palm

Received 26 June 1986; accepted 6 October 1986.