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Related Concept Videos

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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...
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Deterministic Recruitment Limitation during Soybean Pod Development Shapes Seed-Transmitted Microbiota Assembly.

Da-Ran Kim1, Min Seong Seok2, Young Min Ko2

  • 1Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju 55365, Republic of Korea.

The ISME Journal
|July 15, 2026
PubMed
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Plant seed development shapes the beneficial microbes passed between generations. Specific pod stages act as a bottleneck, selecting for a "guardian" microbiota that enhances plant resilience and health.

Keywords:
Ecological filteringFlowerSeed microbiotaVertical transmission

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Area of Science:

  • Plant-microbe interactions
  • Microbial ecology
  • Crop science

Background:

  • Transgenerational inheritance of plant microbiota is crucial for host fitness.
  • The ecological processes governing microbial assembly from flower to seed are not well understood.

Purpose of the Study:

  • To characterize the soybean microbiota dynamics across developmental stages.
  • To identify critical seed-pod stages influencing endophyte recruitment.
  • To understand the functional roles of the seed microbiota in plant resilience.

Main Methods:

  • Spatiotemporal analysis of soybean microbiota.
  • Functional characterization of microbial communities.
  • Defined microbial community assays.
  • Anatomical studies of the soybean endocarp.

Main Results:

  • The floral stage is a high-diversity recruitment phase dominated by stochastic processes.
  • Pod enclosure creates a deterministic bottleneck, shifting the microbiota to a specialized "guardian" community.
  • Keystone taxa exhibit niche partitioning and functional complementarity, conferring collective resilience.
  • The soybean endocarp serves as an interface for maternal microbe redistribution to the seed.

Conclusions:

  • Specific seed-pod stages act as a critical bottleneck for endophyte recruitment.
  • The soybean microbiota provides resilience against salinity stress and pathogen infection.
  • Findings define a "transmission window" for microbiota-based crop improvement strategies.