Comparison of mild and severe strains of papaya ringspot virus based on their coat protein. / Comparação de estirpes fracas e severas do papaya ringspot virus com base na capa protéica.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Papaya ringspot virus (PRSV), a species of the enus Potyvirus, is classified into two strains: "papaya" (P) and "watermelon" (W). Papaya ringspot virus - type W (PRSV-W) has been considered one of the most important viruses infecting cucurbits in Brazil due to its predominance and significative damage caused on the crops. The control of the disease caused by this virus has been efficiently achieved by means of cross protection with three mild strains, namely PRSV-W-1, PRSV-W-2, and PRSV-W-3. The main purpose of the present study was to compare these mild strains with the severe strains PRSV-W-C, PRSV-W-PR, and PRSV-W-PE, based on the nucleotide sequence of the coat protein gene and on the mobility of the capsid protein in SDS-PAGE. The nucleotide sequence of the coat protein gene of the mild strains PRSV-W-1 and PRSV-W-2 showed 100 % of homology. When compared with the coat protein gene of the mild strain PRSV-W-3, the homology was 98 %. The mild strains PRSV-W-1 and PRSV-W-2 showed 95 % of homology with the severe strains PRSV-W-C and PRSV-W-PE. These two severe strains, otherwise, showed respectively, 93 and 95 % of homology with the mild strain PRSV-W-3. The alignment of the nucleotide sequences of the mild and the severe strains indicated an insertion of 6 nucleotides in the conserved region of the coat protein gene of the mild strains. This insertion reflected on the addition of two amino acids (Asn e Asp) in the amino acid deduced sequence of this protein. The mobility of the coat protein in SDS-PAGE was similar for all the strains studied.

ASSUNTO(S)

cucurbitacease virus imunização nucleotide sequence cucurbitacea sequência de nucleotídeo serologia potyvirus vírus fitopatogênico immunization serology

ACESSO AO ARTIGO

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