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A terpenoid phytoalexin plays a role in basal defense of Nicotiana benthamiana against Potato virus X.


ABSTRACT: Terpenoid phytoalexins function as defense compound against a broad spectrum of pathogens and pests in the plant kingdom. However, the role of phytoalexin in antiviral defense is still elusive. In this study, we identified the biosynthesis pathway of a sesquiterpenoid phytoalexin, capsidiol 3-acetate as an antiviral response against RNA virus Potato Virus X (PVX) in Nicotiana benthamiana. NbTPS1 and NbEAH genes were found strongly induced by PVX-infection. Enzymatic activity and genetic evidence indicated that both genes were involved in the PVX-induced biosynthesis of capsidiol 3-acetate. NbTPS1- or NbEAH-silenced plant was more susceptible to PVX. The accumulation of capsidiol 3-acetate in PVX-infected plant was partially regulated by jasmonic acid signaling receptor COI1. These findings provide an insight into a novel mechanism of how plant uses the basal arsenal machinery to mount a fight against virus attack even in susceptible species.

SUBMITTER: Li R 

PROVIDER: S-EPMC4438586 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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A terpenoid phytoalexin plays a role in basal defense of Nicotiana benthamiana against Potato virus X.

Li Ran R   Tee Chuan-Sia CS   Jiang Yu-Lin YL   Jiang Xi-Yuan XY   Venkatesh Prasanna Nori PN   Sarojam Rajani R   Ye Jian J  

Scientific reports 20150520


Terpenoid phytoalexins function as defense compound against a broad spectrum of pathogens and pests in the plant kingdom. However, the role of phytoalexin in antiviral defense is still elusive. In this study, we identified the biosynthesis pathway of a sesquiterpenoid phytoalexin, capsidiol 3-acetate as an antiviral response against RNA virus Potato Virus X (PVX) in Nicotiana benthamiana. NbTPS1 and NbEAH genes were found strongly induced by PVX-infection. Enzymatic activity and genetic evidence  ...[more]

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