Tennant, PF; Gonsalves, C; Ling, KS; Fitch, M; Mashardt, R; Slightom, JL; Gonsalves, D
Phytopathology. 1994 August. 84(11):1359-1366
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Transgenic papaya expressing the coat protein gene of the mild papaya ringspot virus strain from Hawaii (PRV HA 5-1) showed high levels of resistance against the severe PRV HA isolate from Hawaii. Inoculation with high concentrations of the virus, multiple mechanical inoculations, or graft inoculations failed to break the resistance of transgenic papaya. Virus recovery assays from these inoculated plants suggested that virus replication and movement were impaired. Transgenic papaya also showed high levels of resistance against severe PRV isolates recently collected from Hawaii. Similarly, PRV HA 5-1 cross-protected papaya offered high levels of protection against two of the three isolates from Hawaii. However, neither transgenic nor mild strain-infected papaya showed good levels of protection against PRV isolates from 11 other geographical regions that were serologically related to PRV HA 5-1. A range of reactions was observed: complete resistance; delay in symptom development and symptom attenuation with PRV isolates from the Bahamas, Florida, and Mexico; and, a shorter delay in symptom development but no symptom attenuation with isolates from Brazil or Thailand.
Tennant, PF, C Gonsalves, KS Ling, M Fitch, R Mashardt, JL Slightom, D Gonsalves. "Differential protection against papaya ringspot virus isolates in coat protein gene transgenic papaya and classically cross-protected papapya." Phytopathology 84.11 (1994): 1359-1366. Web. 24 Jan. 2020.
Tennant, PF., Gonsalves, C., Ling, KS., Fitch, M., Mashardt, R., Slightom, JL., & Gonsalves, D. (1994). Differential protection against papaya ringspot virus isolates in coat protein gene transgenic papaya and classically cross-protected papapya. Phytopathology, 84(11), 1359-1366.
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