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The main objective of the present study was to evaluate the effect of the sunhemp (Crotalaria juncea) host species on the protective ability of two mild strains of Passion fruit woodiness virus (PWV), named F-101 and F-144, which had failed to protect passion flowers (Passiflora edulis f. flavicarpa) in previous experiments. The nucleotide sequences of the capsid protein (CP) gene and the 3'-non-translated region (3'-NTR) of these mild strains and the severe strain of PWV-SP were compared to confirm their relationship. The results of two protective tests with sunhemp plants in the greenhouse and one test under field conditions showed that all plants infected with either mild strain were protected against infection and/or symptom expression of the severe strain of PWV-SP. Evaluation of the relative concentration of the mild strains in sun hemp leaves showed an apparent uniformity in virus distribution in the leaf tissues, different than that which was previously reported for these mild strains in passion flower leaves. These results agree with previous studies that showed the effect of the concentration of the protective strains and the host species in the protection process. Este trabalho teve por objetivo estudar o efeito em crotalária (Crotalaria juncea) em testes de proteção utilizando duas estirpes fracas do Passion fruit woodiness virus (PWV), denominadas F-101 e F-144, as quais falharam na proteção, de maracujazeiros (Passiflora edulis f. flavicarpa) contra a estirpe severa PWV-SP em experimentos anteriores. Para a confirmação da relação entre as estirpes fracas e a estirpe severa PWV-SP foram obtidas as seqüências de nucleotídeos do gene da capa protéica e da região 3' não traduzida. Os resultados de dois testes de proteção em plantas de crotalária em casa de vegetação e um em campo mostraram que todas as plantas infectadas com as estirpes fracas ficaram protegidas contra a infecção e/ou expressão dos sintomas da estirpe severa (PWV-SP). Avaliações da concentração relativa das estirpes fracas nas folhas da crotalária mostraram uma aparente uniformidade na distribuição do vírus nos tecidos foliares, diferente do que foi relatado sobre a distribuição destas mesmas estirpes em folhas de maracujazeiro. Estes resultados estão de acordo com outros relatos na literatura que mostraram o efeito da concentração das estirpes fracas e da espécie hospedeira no processo de proteção

Protection between strains of Passion fruit woodiness virus in sunnhemp