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Microbial diversity observed during hemp retting.

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Applied Microbiology and Biotechnology
|January 11, 2015
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This study quantifies bacteria and fungi during hemp retting, finding microbial proportions vary by harvest conditions. This research aids in optimizing hemp fiber quality through microbial strain selection.

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Area of Science:

  • Agricultural Science
  • Microbiology
  • Materials Science

Background:

  • Hemp fiber is increasingly used in composite materials due to economic and ecological benefits.
  • Standardizing hemp fiber fabrication processes is challenging, limiting wider applications.
  • Optimizing microbial retting is crucial for enhancing hemp fiber quality.

Purpose of the Study:

  • To characterize the microbial communities associated with hemp stems during field retting.
  • To quantify bacterial and fungal populations using real-time PCR.
  • To perform phylogenetic analysis of dominant microorganisms for future strain selection.

Main Methods:

  • Six hemp samples were collected under diverse field conditions (ground type, harvest date, retting duration).
  • DNA was extracted, and total bacteria and fungi were quantified via real-time PCR targeting 16S and 18S ribosomal RNA (rRNA) genes.
  • Phylogenetic characterization of dominant microorganisms was conducted using sequence analysis of cloned rRNA genes.

Main Results:

  • Bacterial populations ranged from 8.1-9.5 log₁₀ 16S rRNA gene copies/gram, and fungal populations from 8.6-9.6 log₁₀ 18S rRNA gene copies/gram.
  • Bacterial diversity was higher than fungal diversity.
  • Identified dominant bacteria include Escherichia coli and Pantoea agglomerans; dominant fungi belong to Cladosporium and Cryptococcus genera.
  • Microbial community composition varied significantly based on ground type, harvest date, and retting duration.

Conclusions:

  • Microbial communities in hemp retting are diverse, with bacterial species like Escherichia coli and Pantoea agglomerans being prevalent.
  • Significant variations in microbial proportions exist depending on environmental factors and retting duration.
  • Understanding these microbial dynamics is essential for selecting specific strains to improve microbial retting efficiency and hemp fiber quality.