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Photomorphogenic responses in maize seedling development.

Nicole H Markelz1, Denise E Costich, Thomas P Brutnell

  • 1Boyce Thompson Institute, Cornell University, Tower Road, Ithaca, New York 14853, USA.

Plant Physiology
|December 3, 2003
PubMed
Summary
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Light significantly impacts maize (Zea mays) seedling development, influencing growth and C4 photosynthesis. This study reveals high variability in light response among maize lines, suggesting artificial selection may have shaped this trait.

Area of Science:

  • Plant Biology
  • Photomorphogenesis
  • Maize Genetics

Background:

  • Light is crucial for maize (Zea mays) seedling development, affecting mesocotyl elongation, root growth, leaf expansion, and C4 photosynthetic differentiation.
  • While photoreceptor systems are known in model plants, light signal transduction in maize remains poorly understood.
  • Understanding light responses in maize is vital for crop improvement and breeding strategies.

Purpose of the Study:

  • To investigate photomorphogenic responses in maize, specifically mesocotyl elongation inhibition and C4 photosynthetic differentiation.
  • To survey light responses across diverse maize germplasm, including a phytochrome-deficient mutant (elm1).
  • To explore the relationship between light responsiveness, genetic subpopulations, and artificial selection in maize.

Main Methods:

Related Experiment Videos

  • Extensive survey of white, red, far-red, and blue light responses in various maize inbred lines and a phytochrome-deficient mutant (elm1).
  • Analysis of C4 gene expression patterns under different light conditions in W22 and elm1.
  • Correlation analysis between light response traits and maize subpopulations.

Main Results:

  • Light response is a highly variable trait in maize, with all examined inbreds possessing a functional phytochrome signal transduction pathway.
  • Several maize lines exhibited reduced sensitivity to blue light.
  • A significant correlation was found between light response and subpopulation, indicating potential artificial selection.
  • Cell-specific C4 gene expression patterns were maintained independently of light quality in fully differentiated tissues.

Conclusions:

  • This study provides the first comprehensive survey of light response in maize.
  • Variability in light response and its correlation with subpopulations suggest artificial selection has influenced this trait in maize breeding.
  • Findings offer insights for developing maize breeding strategies focused on optimizing light responsiveness.