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Seed banking impacts native Acacia ulicifolia seed microbiome composition and function.

Dylan Russell1, Vaheesan Rajabal1,2, Matthew Alfonzetti1

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Environmental Microbiome
|January 12, 2025
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Summary

Seed banking reduces the diversity and beneficial bacteria on seeds, impacting plant growth. Stored seeds harbor fewer microbes, potentially harming seedling establishment and plant health.

Keywords:
Bacterial traitsConservationNative seed microbiotaPlant growth-promoting traitsSeed epiphytesSeed storage

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Area of Science:

  • Microbiology
  • Botany
  • Ecology

Background:

  • Seed banks are crucial for plant diversity but often yield poor seedling success.
  • Seed-associated microbes influence seed quality and plant health.
  • The impact of seed banking on seed microbiomes is poorly understood.

Purpose of the Study:

  • Investigate the effects of seed banking on the composition and function of seed-associated bacterial communities.
  • Compare the seed microbiomes of stored versus freshly collected Acacia ulicifolia seeds.

Main Methods:

  • Utilized 16S rRNA gene sequencing to analyze bacterial communities.
  • Employed culture-based methods to assess functional traits of bacteria.
  • Examined epiphytic bacteria on stored and fresh Acacia ulicifolia seeds.

Main Results:

  • Stored seeds exhibited significantly less diverse bacterial populations compared to fresh seeds.
  • Key plant growth-promoting bacteria (e.g., IAA producers, phosphate solubilizers) were less abundant on stored seeds.
  • Reduced prevalence of beneficial microbial traits was observed in seeds from banking facilities.

Conclusions:

  • Seed banking processes alter epiphytic seed microbiomes.
  • Storage conditions select for bacteria tolerant to the environment, potentially reducing beneficial microbes.
  • Changes in seed microbiomes during storage may negatively affect seedling establishment and plant growth.