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Characterization of peroxidases in lignifying peach fruit endocarp.

F B Abeles1, C L Biles

  • 1U.S. Department of Agriculture, Agricultural Research Service, Appalachian Fruit Research Station, Kearneysville, West Virginia 25430.

Plant Physiology
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

Peroxidases play a role in peach fruit lignification, with basic peroxidases more abundant in the lignifying endocarp than the mesocarp. Tissue printing may miss enzymes firmly bound to cell walls.

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Fruit Development

Background:

  • Lignification is a critical process in plant cell wall development, particularly in woody tissues and fruit endocarps.
  • Peroxidases are enzymes implicated in various plant processes, including cell wall modifications like lignification.
  • Peach (Prunus persica) endocarp undergoes significant lignification during fruit development, making it a model for studying this process.

Purpose of the Study:

  • To investigate the specific roles and types of peroxidases involved in the lignification of peach fruit endocarp.
  • To compare peroxidase activity and profiles between the lignifying endocarp and the non-lignifying mesocarp of developing peach fruit.
  • To assess the suitability of tissue printing as a method for detecting peroxidases in lignifying plant tissues.

Main Methods:

  • Enzyme extraction and characterization of peroxidases from developing peach endocarp and mesocarp tissues.
  • Isoelectric focusing and activity staining to differentiate and quantify acidic and basic peroxidases.
  • Histochemical staining (phloroglucinol-HCl) to detect lignin presence in cultured peach leaf cells.
  • Tissue printing on nitrocellulose membranes to visualize peroxidase activity in situ.

Main Results:

  • Acidic peroxidases in the lignifying endocarp showed similarities to those in the mesocarp.
  • A higher quantity and diversity of basic peroxidases were found in the endocarp compared to the mesocarp.
  • Cultured peach leaf cells, presumed to be lignifying, secreted a basic peroxidase.
  • Peroxidases were challenging to extract from highly lignified endocarp tissue.
  • Tissue prints revealed peroxidase activity in the mesocarp but not the endocarp.

Conclusions:

  • Basic peroxidases are likely more involved in the lignification of peach endocarp than acidic peroxidases.
  • The difficulty in extracting and detecting peroxidases in lignified endocarp suggests strong binding to cell wall components.
  • Tissue printing may not be effective for detecting enzymes that are tightly associated with the cell wall structure, potentially underestimating their role.