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Microstructure determines floating ability of weed seeds.

Xinglei Shi1, Ruhai Li1,2, Zheng Zhang1

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Weed seeds disperse via water, with anatomical structures like parenchyma and aerenchyma influencing their floating ability. Understanding these adaptations aids in developing sustainable weed control strategies in agriculture.

Keywords:
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Area of Science:

  • Agricultural Science
  • Botany
  • Ecology

Background:

  • Weed seeds spread through water in rice-wheat cropping systems.
  • The adaptation mechanisms and structural basis for water dispersal of weed seeds are not well understood.

Purpose of the Study:

  • To investigate the relationship between weed seed anatomy and their water dispersal ability.
  • To categorize weed seeds based on their floating characteristics and structural properties.

Main Methods:

  • Examined 110 weed seed species using freeze sectioning to analyze tissue proportions (parenchyma, aerenchyma, lignified tissue).
  • Assessed seed microstructure, morphology, size, and appendages.
  • Employed multivariate statistical and cluster analysis to correlate traits with floating time.

Main Results:

  • Floating time positively correlated with seed shape, aerenchyma, and parenchyma, and negatively with lignified tissue.
  • Four categories of floating ability were identified: super floating (>400h), strong floating (120-400h), floating (<120h), and non-floating.
  • Seed anatomy, particularly parenchyma and air chambers, significantly impacts buoyancy and dispersal.

Conclusions:

  • Most weed seeds exhibit floating capabilities linked to their anatomical structures.
  • Understanding these adaptations is crucial for ecological insights and developing sustainable weed management practices, such as targeted removal of floating seeds.