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Striking developmental convergence in angiosperm endoparasites.

Luiza Teixeira-Costa1,2, Charles C Davis2, Gregorio Ceccantini1

  • 1Institute of Biosciences, University of Sao Paulo, Sao Paulo, 05508-090, Brazil.

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Summary

Parasitic plants show two distinct developmental paths. Some retain embryonic traits, connecting late to host vessels, while others specialize early, impacting host xylem. This may relate to photosynthesis.

Keywords:
ArceuthobiumApodanthaceaeCytinaceaeMitrastemonaceaeRafflesiaceaeendoparasiteholoparasitemistletoeparasitic plantsplant development

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Area of Science:

  • Plant biology
  • Evolutionary biology
  • Parasitic plant research

Background:

  • Endoparasitic plants exhibit extreme reduction and internal host growth.
  • Previously, these were considered a single evolutionary group based on morphology.
  • Phylogenetic studies reveal they belong to diverse clades, enabling convergence studies.

Purpose of the Study:

  • To investigate developmental convergence in parasitic plants with similar life histories.
  • To compare the ontogeny of host-parasite connections in distantly related endoparasites.
  • To understand the developmental basis for extreme parasitic plant adaptations.

Main Methods:

  • Sampled species from Apodanthaceae, Cytinaceae, Mitrastemonaceae, Rafflesiaceae, and Santalaceae.
  • Analyzed developmental stages using microtomography and microscopy.
  • Examined host-parasite vascular connections and growth patterns.

Main Results:

  • Apodanthaceae, Cytinaceae, Mitrastemonaceae, and Rafflesiaceae showed late cell differentiation and direct host vessel connections.
  • These species significantly altered host xylem development; some connected to host phloem.
  • Endophytic Santalaceae displayed early cell differentiation and minimal impact on host anatomy.

Conclusions:

  • Identified two distinct developmental trajectories in endoparasitic plants.
  • One trajectory involves retained embryonic traits and late vascular connection (Apodanthaceae, Cytinaceae, Mitrastemonaceae, Rafflesiaceae).
  • The other involves early tissue specialization and host xylem connection (Santalaceae), potentially linked to photosynthetic ability.