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Fluorescent prey traps in carnivorous plants.

R Kurup1, A J Johnson, S Sankar

  • 1Phytochemistry and Phytopharmacology Division, Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Pacha-Palode, Thiruvananthapuram,Kerala, India.

Plant Biology (Stuttgart, Germany)
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Summary

Carnivorous plants use blue fluorescence emissions to attract prey. This visual cue, emitted by traps of Nepenthes, Sarracenia, and Dionaea, plays a crucial role in prey capture.

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Area of Science:

  • Botany
  • Biochemistry
  • Ecology

Background:

  • Carnivorous plants lure prey using nectar, color, and scent.
  • The role of visual cues beyond visible light in prey attraction is not well understood.

Purpose of the Study:

  • To investigate ultraviolet (UV) fluorescence emissions in carnivorous plant traps.
  • To determine if these emissions contribute to prey attraction.

Main Methods:

  • Scanning of fresh prey traps from 14 Nepenthes, 5 Sarracenia, 5 Drosera, 2 Pinguicula, Dionaea muscipula, and Utricularia stellaris at UV 366 nm.
  • Recording fluorescence emissions of Nepenthes khasiana pitcher peristome isolates.
  • Masking blue fluorescence on N. khasiana peristomes and comparing prey capture rates with controls.

Main Results:

  • Distinct blue fluorescence emissions were observed at the capture sites of Nepenthes, Sarracenia, and Dionaea traps under UV 366 nm.
  • These blue emissions intensified during trap growth and faded as traps aged.
  • Masking the blue fluorescence significantly reduced prey capture in N. khasiana.

Conclusions:

  • UV-induced blue fluorescence is a key factor attracting arthropods to Nepenthes, Sarracenia, and Dionaea traps.
  • This visual attractant complements known lures like nectar and color.
  • Drosera, Pinguicula, and Utricularia traps primarily exhibit red chlorophyll fluorescence, suggesting different attraction mechanisms.