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Nicotine's defensive function in nature.

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Nicotine in native tobacco (Nicotiana attenuata) effectively deters herbivores. Genetic modification to reduce nicotine levels in these plants led to increased herbivore damage in their natural environment, confirming nicotine's defensive role.

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Area of Science:

  • Plant biology
  • Chemical ecology
  • Evolutionary biology

Background:

  • Plants produce defensive metabolites to deter herbivores.
  • Herbivores evolve resistance to plant defenses.
  • The ecological role of many plant resistance traits remains unproven in natural settings.

Purpose of the Study:

  • To demonstrate the in-nature defensive function of nicotine in native tobacco (Nicotiana attenuata).
  • To assess the impact of reduced nicotine production on plant-herbivore interactions.
  • To validate the ecological relevance of plant defense mechanisms using genetic modification.

Main Methods:

  • Genetic transformation of Nicotiana attenuata using antisense or inverted-repeat (IRpmt) constructs targeting putrescine N-methyl transferase (pmt) genes.
  • Quantification of nicotine levels and analysis of metabolic byproducts (anatabine).
  • Performance assays with herbivores (Manduca sexta, Diabrotica undecimpunctata) and field studies assessing herbivore attack and leaf damage on wild-type and IRpmt plants.

Main Results:

  • IRpmt transformation significantly reduced nicotine levels (>95%) in Nicotiana attenuata.
  • Nicotine-depleted plants showed increased susceptibility to native herbivores, with 3-fold greater leaf area loss.
  • Herbivores, including Manduca sexta and Spodoptera exigua, preferred and performed better on IRpmt plants.

Conclusions:

  • Nicotine is a crucial and effective natural defense compound for Nicotiana attenuata against a range of herbivores.
  • Transgenic approaches are valuable tools for elucidating the ecological roles of plant defense traits in natural ecosystems.
  • Reduced nicotine levels compromise plant survival and fitness in the face of herbivory.