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JXB Advance Access published online on November 17, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erh004
© 2003 by Oxford University Press
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Received March 28, 2003; accepted July 11, 2003
© 2003 Society for Experimental Biology

CROSS-TALK IN PLANT SIGNAL TRANSDUCTION SPECIAL ISSUE ARTICLE

Virus-induced gene silencing of jasmonate-induced direct defences, nicotine and trypsin proteinase-inhibitors in Nicotiana attenuata

Rainer Saedler 1 and Ian T. Baldwin 1*

1 Max-Planck-Institut für Chemische Ökologie, Hans-Knöll-Str. 8, 07745 Jena, Germany

* To whom correspondence should be addressed. E-mail: Baldwin{at}ice.mpg.de.


  Abstract

Research into the molecular basis of plant-insect interactions is hampered by the inability to alter the expression of individual genes in plants growing under natural conditions. The ability of virus-induced gene silencing (VIGS) to silence the expression of two jasmonate-induced genes known to mediate the expression of two potent direct defences (nicotine and proteinase inhibitors) that are produced in different tissues (roots and shoots, respectively) in Nicotiana attenuata is documented here. Fragments of consensus sequences of N. attenuata’s putrescine N-methyltransferase (PMT) and trypsin inhibitor (TI) genes were cloned in sense, anti-sense and inverted repeat orientations into the Tobacco Rattle Virus (TRV) to trigger post-transcriptional gene silencing by Agrobacterium-mediated inoculation in plants previously elicited with methyl jasmonate (MeJA) or left as controls. MeJA treatment elicited 2.4- and 9.8-fold increases in the concentrations of nicotine and proteinase inhibitors, respectively, and inoculation with constructs containing appropriate genes inhibited these MeJA-induced increases and halved constitutive accumulations, regardless of the orientation of the gene fragment. Root PMT transcript levels were significantly elevated in MeJA-treated plants 10 h after elicitation, but not in plants inoculated with the appropriate TRV constructs 9 d prior to MeJA treatment, demonstrating that VIGS was responsible for the inhibition of these potent direct defences. While additional research is required to minimize the effects on plant growth and the risks of using such constructs in natural settings, it is concluded that VIGS has a potential to manipulate the expression of genes important for ecological interactions.

Key words: Direct defences, nicotine, proteinase inhibitors, Tobacco Rattle Virus, virus-induced gene silencing.


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