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Protein synthesis patterns in barley embryos during germination.

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  • 1Welsh Plant Breeding Station, SY 23-3 EB, Aberystwyth, UK.

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The barley scutellum drives early protein synthesis during germination, peaking at 4 hours. This activity, linked to gibberellin production, precedes radicle growth and suggests the scutellum initiates the hormonal stimulus for germination.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • Germination in barley (Hordeum vulgare) involves complex metabolic processes.
  • Understanding early protein synthesis and hormonal regulation is crucial for seed development.

Purpose of the Study:

  • To describe the pattern of amino acid incorporation into protein during early barley embryo germination.
  • To investigate the role of the scutellum in early protein synthesis and gibberellin production.

Main Methods:

  • Isolated barley embryos were incubated with [(14)C] amino acids to track protein synthesis.
  • Incorporation of [17-(14)C] kaurenoic acid was measured to assess gibberellin synthesis.
  • The effects of actinomycin-D on protein synthesis were evaluated.

Main Results:

  • Two peaks of protein synthesis were observed at 4 and 8 hours, with a minimum at 5.5 hours.
  • The initial peak (4h) was scutellum-dependent and actinomycin-D insensitive.
  • Gibberellin synthesis showed high activity within 2-4 hours, originating from the scutellum.

Conclusions:

  • The scutellum is the likely source of the initial gibberellin stimulus for barley germination.
  • Protein synthesis in the scutellum plays a key role in the early stages of germination.
  • Gibberellin production is closely linked to early protein synthetic activity in the embryo.