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Correlations between the Amino Acid and Nucleotide Composition of Plant Virus Particles: Evidence that Plants use the same Genetic Code as Bacteria

Department of Microbiology, John Curtin School of Medical Research, Australian National University, Canberra, Australia

G. A. MacIntyre

Division of Mathematical Statistics, Commonwealth Scientific and Industrial Research Organization, Canberra, Australia

Correlations between the amino acid and nucleotide compositions of the particles of 41 plant viruses suggest that plant viruses, and hence presumably plants, use the same genetic code as bacteria, and that the gene for the protein in the particles of each of these viruses has a nucleotide composition similar to that of the whole nucleic acid molecule of the virus.

Received 10 March 1969; accepted 10 June 1969.