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Barley grain maturation reveals distinct enzyme activity patterns. Alpha-amylase and phosphorylase peak early, while beta-amylase activity, especially latent forms, maximizes later in development.

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Area of Science:

  • Biochemistry
  • Plant Physiology
  • Enzymology

Background:

  • Enzymes like alpha-amylase, beta-amylase, and phosphorylase play crucial roles in carbohydrate metabolism.
  • Understanding the developmental regulation of these enzymes in cereal grains is essential for crop science.

Purpose of the Study:

  • To investigate the activity profiles of alpha-amylase, beta-amylase (both latent and available forms), and phosphorylase during barley grain maturation.
  • To determine the tissue-specific localization and developmental changes of beta-amylase activity within the barley grain.

Main Methods:

  • Enzyme assays were performed on whole barley grains throughout the maturation period.
  • Specific tissues (endosperm, aleurone, testa pericarp, embryo) were isolated and analyzed for beta-amylase activity.
  • Activity measurements were correlated with days after anthesis.

Main Results:

  • Alpha-amylase and phosphorylase activities peaked between 25-30 days post-anthesis.
  • Total beta-amylase activity reached maximum at 35 days post-anthesis and remained constant.
  • Latent beta-amylase was prominent in the aleurone and testa pericarp, with distinct developmental patterns, while the embryo showed no hydrolytic activity.

Conclusions:

  • Enzyme activity in barley grains is developmentally regulated, with distinct temporal and spatial patterns.
  • Beta-amylase, particularly its latent form, exhibits complex localization and maturation dynamics within the barley grain.
  • These findings contribute to understanding grain development and carbohydrate mobilization in cereals.