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DEVELOPMENT OF THE SYMBIOSIS OF CONVOLUTA ROSCOFFENSIS GRAFF AND PLATYMONAS SP.(1).

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The acoel flatworm Convoluta roscoffensis must be reinfected each generation by Platymonas sp. algae, which undergo significant morphological changes within the worm to establish a symbiotic relationship.

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Area of Science:

  • Symbiotic relationships
  • Marine biology
  • Cell biology

Background:

  • The acoel flatworm Convoluta roscoffensis engages in a symbiotic relationship with the alga Platymonas sp.
  • This symbiosis is crucial for the survival of C. roscoffensis, as it relies on the alga for nutrition.

Purpose of the Study:

  • To investigate the morphological changes of Platymonas sp. algae within the acoel flatworm Convoluta roscoffensis.
  • To understand the process of infection and the establishment of symbiosis between the two organisms.

Main Methods:

  • Microscopic observation of infected C. roscoffensis.
  • Analysis of algal morphology at different stages of infection.
  • Investigation of potential enzymatic processes involved in algal transformation.

Main Results:

  • Platymonas sp. algae lose flagella, theca, and eyespot sequentially after infecting C. roscoffensis.
  • Algal flagellar basal bodies and striated rootlets persist within the host.
  • Infected algae adopt an irregular shape with fingerlike processes that interface with host cells, a form potentially essential for mutualism.

Conclusions:

  • The morphological alterations of Platymonas sp. are a critical adaptation for survival and function within C. roscoffensis.
  • The loss of the theca may involve enzymatic dissolution, facilitating the intimate association between alga and host.
  • The transformed algal morphology is a prerequisite for establishing a balanced photosynthetic mutualism.