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Factors affecting Citrus tree isozyme-gene expression.

M J Asíns1, R Herrero, L Navarro

  • 1Instituto Valenciano de Investigaciones Agrarias, Apdo. Oficial., 46113, Moncada (Valencia), Spain.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 1, 2013
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Summary
This summary is machine-generated.

Enzymatic systems in Citrus species are useful for genetic studies, but expression can vary with leaf sunlight exposure and tree age. Viroids can alter enzyme patterns, impacting identification and offering insights into plant responses.

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Area of Science:

  • Plant biochemistry
  • Enzyme kinetics
  • Citrus genetics

Background:

  • Enzymatic systems are crucial for identifying Citrus species and understanding genetic variability.
  • Factors like season, location, rootstock, and tree age can influence enzyme expression.

Purpose of the Study:

  • To evaluate ten enzymatic systems in Citrus for identification and genetic variability.
  • To investigate the impact of environmental and biological factors on enzyme expression.

Main Methods:

  • Assay of ten enzymatic systems across various Citrus species and cultivars.
  • Analysis of enzyme expression under different conditions: season, location, rootstock, branch position, infection, and tree age.
  • Zymogram analysis for specific enzymes like 6-phosphogluconate dehydrogenase (6PG) and peroxidases (PRX).

Main Results:

  • Cu/Zn superoxide dismutase (SOD) presence varied with leaf sunlight exposure.
  • Viroids induced significant changes in 6PG and PRXa zymograms in Citrus medica, including a novel peroxidase.
  • Tree age significantly affected PRX, MDH, and 6PG patterns, with notable shifts around the first year and later stages, likely due to post-translational modifications.

Conclusions:

  • Enzyme profiling in Citrus is influenced by factors like sunlight exposure and tree age, requiring careful consideration for accurate identification.
  • Viroid infections can alter enzyme profiles, potentially complicating identification but offering a tool to study plant-pathogen interactions.
  • Age-related enzymatic changes suggest developmental shifts and post-translational modifications in Citrus species.