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Related Experiment Videos

Distinct developmental defense activations in barley embryos identified by transcriptome profiling.

Mads Eggert Nielsen1, Finn Lok, Henrik Bjørn Nielsen

  • 1Carlsberg Research Laboratory, DK-2500, Copenhagen, Denmark. mads.nielsen@crc.dk

Plant Molecular Biology
|August 10, 2006
PubMed
Summary

Barley embryo development involves two defense activation stages, protecting the grain from disease. These stages involve specific gene expression and defense mechanisms, independent of jasmonic or salicylic acid increases.

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Area of Science:

  • Plant Science
  • Molecular Biology
  • Agricultural Science

Background:

  • Embryo development in barley is critical for crop growth and disease resistance.
  • Mechanisms of embryo disease resistance during dormancy are poorly understood.

Purpose of the Study:

  • To investigate the molecular basis of defense activation during barley embryo development.
  • To identify distinct phases of defense activation and their genetic regulation.

Main Methods:

  • Microarray analysis of over 22,000 genes during barley embryo development.
  • Measurement of jasmonic acid and salicylic acid levels throughout embryo development.

Main Results:

  • Identified two distinct phases of developmental defense activation (DDA) in barley embryos.

Related Experiment Videos

  • Early DDA (around 20 days post-flowering) involves up-regulation of genes for 9-lipoxygenase, oxylipin synthesis, and phenylpropanoid phytoalexin pathways.
  • Late DDA (around 37 days post-flowering) shows up-regulation of antioxidant response genes and pathogenesis-related (PR) genes.

    • Conclusions:

    • Developmental defense activation (DDA) in barley embryos provides disease resistance.
    • These defense mechanisms are established during embryo development, independent of jasmonic or salicylic acid signaling.
    • Understanding DDA enhances strategies for protecting barley grain from pathogens.