Transgenic resistance by N gene of a Peanut bud necrosis virus isolate of characteristic phylogeny

The nucleocapsid protein ( N ) gene of a Tospovirus devastating tomato crop in the south Indian state of Tamil Nadu was cloned and characterized. The high identity of the cloned sequence to a Peanut bud necrosis virus (PBNV) tomato isolate (97.8/99.6% nucleotide/amino acid) and a PBNV peanut isolate...

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Veröffentlicht in:Virus genes 2009-06, Vol.38 (3), p.445-454
Hauptverfasser: Venkatesan, S., Raja, J. A. J., Maruthasalam, S., Kumar, K. K., Ramanathan, A., Sudhakar, D., Balasubramanian, P.
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container_issue 3
container_start_page 445
container_title Virus genes
container_volume 38
creator Venkatesan, S.
Raja, J. A. J.
Maruthasalam, S.
Kumar, K. K.
Ramanathan, A.
Sudhakar, D.
Balasubramanian, P.
description The nucleocapsid protein ( N ) gene of a Tospovirus devastating tomato crop in the south Indian state of Tamil Nadu was cloned and characterized. The high identity of the cloned sequence to a Peanut bud necrosis virus (PBNV) tomato isolate (97.8/99.6% nucleotide/amino acid) and a PBNV peanut isolate (94.4/96.3% nucleotide/amino acid) identified the Tospovirus as an isolate of PBNV, designated PBNV Coimbatore tomato (PBNV CT) isolate. Phylogenetic analysis of PBNV CT N gene provided useful insights into the movement and evolution of PBNV within Indian Territory. The characteristic phylogeny of PBNV CT N gene implied its potential to be an efficient transgene to confer effective PBNV resistance on crop plants. The efficacy of PBNV CT N gene in conferring PBNV resistance was studied by generating tobacco ( Nicotiana tabacum L. cv Wisconsin) lines transgenic to the sense or antisense version of the gene. Several transgenic lines showed transgenic mRNA and/or protein accumulation, ranging from very high to undetectable levels, accompanied by different degrees of PBNV resistance. The undetectable or very low levels of transgene transcripts in certain PBNV-resistant sense or antisense N gene transgenic lines suggested RNA-mediated resistance by post-transcriptional gene silencing (PTGS) mechanism. However, PBNV resistance of certain transgenic lines with high levels of N gene transcripts was suggestive of possible operation of RNA-mediated non-PTGS mechanism(s) of resistance in those lines. Moreover, the high levels of N protein in certain PBNV-resistant sense N gene transgenic lines suggested protein-mediated resistance. The results predict the potential of PBNV CT N gene to confer effective PBNV resistance on tomato and other economically important crops.
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subjects Arachis hypogaea
Biomedical and Life Sciences
Biomedicine
Immunity, Innate
Lycopersicon esculentum
Medical Microbiology
Nicotiana - genetics
Nicotiana tabacum
Nucleocapsid Proteins - biosynthesis
Nucleocapsid Proteins - genetics
Phylogeny
Plant Diseases - immunology
Plant Diseases - virology
Plant Sciences
Plants, Genetically Modified - genetics
Plants, Genetically Modified - immunology
Plants, Genetically Modified - virology
RNA Interference
RNA, Viral - genetics
Sequence Analysis, DNA
Sequence Homology
Solanum lycopersicum - virology
Tospovirus
Tospovirus - genetics
Tospovirus - isolation & purification
Virology
Wisconsin
title Transgenic resistance by N gene of a Peanut bud necrosis virus isolate of characteristic phylogeny
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