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Can fern spores develop hydration memory in response to priming?

Luis V Pedrero-López1, Blanca Pérez-García2, Klaus Mehltreter3

  • 1Instituto de Ecología, Universidad Nacional Autónoma de México, Av. Universidad 3000, C. P. 04510, Ciudad de México, Mexico; Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de, Ciudad de México, Mexico.

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PubMed
Summary

Fern spores exhibit hydration memory, similar to seeds, allowing them to germinate faster after dehydration. This ability, likely evolved in soil banks, enhances germination success through natural hydration-dehydration cycles.

Keywords:
Fern spore germinationHydro-primingMatrix-primingNatural-primingPre-germination treatmentsSpore hydration-dehydration treatments

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Area of Science:

  • Plant biology
  • Seed physiology
  • Pteridophyte research

Background:

  • Fern spores and seeds share germination processes involving water uptake and metabolic preparation.
  • Seeds can develop 'hydration memory' after dehydration, enabling rapid re-germination.
  • The capacity for hydration memory in fern spores remains largely unexplored.

Purpose of the Study:

  • To investigate whether fern spores can develop hydration memory.
  • To assess the effects of different priming treatments on spore germination.
  • To understand the ecological implications of hydration memory in fern spore banks.

Main Methods:

  • Spores from six fern species underwent hydro-priming, matrix-priming, or natural-priming.
  • Primed spores were dehydrated and then germinated under controlled laboratory conditions.
  • Germination was quantified by lag-time, germination rate, and germination percentage.

Main Results:

  • Priming treatments generally reduced lag time and/or increased germination rate and percentage compared to controls.
  • Matrix-priming (8 days) decreased germination percentage in three of the tested fern species.
  • These findings indicate that fern spores possess a hydration memory.

Conclusions:

  • Fern spores demonstrate hydration memory, a trait likely evolved in soil seed banks.
  • Hydration-dehydration cycles in natural soil environments may confer significant advantages for fern spore germination.
  • This research provides evidence for a previously unrecognized survival and germination strategy in ferns.