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Agroinfiltration-based Potato Virus X Replicons to Dissect the Requirements of Viral Infection

  • Park, Sang-Ho (Department of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University) ;
  • Kim, Kook-Hyung (Department of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University)
  • Published : 2006.12.01

Abstract

Extensive research of the Potato virus X(PVX) has been performed in in vitro transcription system using the bacteriophage T7 promoter. We constructed an efficient T-DNA based binary vector, pSNU1, and modified vectors carrying PVX replicons. The suitability of the construct to transiently express PVX RNA using Agrobacterium tumefaciens was tested by analysis of infectivity in plants. The expressed PVX RNA was infectous and systemically spread in three plant species including Nicotiana benthamiana, N. tabacum cv. Xanthi-nc, and Capsicum annuum cv. Chilsungcho. The PVX full length construct, pSPVXp31, was caused severe mosaic symptoms on N. benthamiana, severe necrotic lesions on C. annuum while milder symptoms and delayed mosaic symptoms were appeared on the systemic leaves on N. tabaccum. RT-PCR analysis confirmed the presence of PVX RNAs on both inoculated and systemic leaves in all three plant species tested. Our results indicated that PVX replicons were efficiently expressed PVX RNA in at least three tested species. Further investigation win be needed to elucidate the mechanism of PVX replication, translation, movement and assembly/disassembly processes.

Keywords

References

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