1887

Abstract

A tandem dimer of miscanthus streak virus (MiSV) DNA was inserted into the T-DNA of the binary plasmid vector pBIN19 and agroinoculated into several monocotyledonous plants (monocots) using or . Disease symptoms and geminate particles were produced in maize and plants, and MiSV-specific double-stranded and single-stranded DNAs were found in these plants. The nucleotide sequence of the infectious MiSV clone, consisting of 2672 nucleotides, was determined. Four open reading frames (ORFs) for proteins of greater than 10K were identified, two (V0 and V2) in the virus (+) sense and two (C1 and C2) in the complementary (-) sense, although C2 did not have an ATG start codon. Unlike other geminiviruses infecting monocots, complementary-sense ORFs did not overlap. Potential splicing donor and acceptor sites were identified in the sequence of the border region between the C terminus of ORF C1 and the N terminus of ORF C2. Amino acid sequences predicted from three (V2, C1 and C2) of these ORFs showed significant homology with the corresponding ORFs of other geminiviruses infecting monocots. A fifth ORF (V1), which showed some homology with ORF V1 of other monocot-infecting geminiviruses despite having a coding capacity for a product of 8.8K, was found just upstream of ORF V2 as observed in those geminiviruses. ORF V0 showed no significant homology with ORFs present in any other geminiviruses. A mutation of V0 indicated that the C-terminal 30% of this ORF was not necessary for infection in maize, but that sequences around the mutated I site might have some regulatory role.

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1991-10-01
2022-10-07
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