Canadian Journal of Plant Pathology (2014) 36, 100-109

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Y.Y. Zhao, D.F. Wang, T.Q. Wu, A. Guo, H.S. Dong and C.L. Zhang (2014)
Transgenic expression of a rice riboflavin synthase gene in tobacco enhances plant growth and resistance to Tobacco mosaic virus
Canadian Journal of Plant Pathology 36 (1), 100-109
Abstract: Several reactions in the multistep riboflavin biosynthesis pathway in plants can affect plant growth and defences. Here, we report that riboflavin synthase (RS), which catalyses the final reaction in the pathway, has similar functions in transgenic tobacco plants. The RS gene identified in rice has low identities with its orthologues from microbes and other plants, but it possesses biological activities since its expression in transgenic tobacco enhanced plant growth and resistance to Tobacco mosaic virus (TMV). Compared with the non-transformed plant, the RS-transformed tobacco (RST) line produced greater amounts of riboflavin and its derivates - the cofactors flavin mononucleotide and flavin adenine dinucleotide. RST plants also produced more ethylene and were highly enhanced in the expression of growth-promoting expansin genes and ethylene signalling genes involved in the regulation of plant growth. In the RST line, moreover, resistance to TMV was enhanced in correlation with enhanced expression of defence response genes. In addition, TMV multiplication was suppressed and the TMV-induced necrosis symptoms were alleviated in RST plants. Therefore, the transgenic expression of the foreign RS gene enhanced plant growth and defence responses to a viral disease in tobacco.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: English)
Link to article at publishers website
Database assignments for author(s): Hansong Dong

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Tobacco mosaic virus Tobacco (Nicotiana tabacum)
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