Nightshade Wound Secretion: The World's Simplest Extrafloral Nectar?

Area of Science:

• Plant biology
• Evolutionary biology
• Chemical ecology

Background:

• Wounded nightshade leaves secrete a sugary liquid.
• This secretion attracts ants, functioning similarly to extrafloral nectar (EFN).
• Ants provide defense against herbivores.

Purpose of the Study:

• To investigate the formation of functioning nectaries in nightshade leaves.
• To understand the implications of easy nectary formation on plant defense strategies.
• To explain the phylogenetic distribution of extrafloral nectaries.

Main Methods:

• Observational analysis of wounded nightshade leaves.
• Chemical analysis of secreted droplets.
• Phylogenetic analysis of nectary distribution.

Main Results:

• Secreted droplets require no detectable nectary tissue for formation.
• The de novo formation of functioning nectaries is readily achievable.
• This ease of formation correlates with the scattered phylogenetic distribution of EFNs.

Conclusions:

• Functioning plant defense nectaries can arise with minimal specialized tissue.
• The plasticity in nectary formation contributes to their widespread and scattered evolutionary presence.
• Nightshade's defense mechanism highlights efficient and adaptable plant-herbivore interactions.