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Clonal analysis of epidermal patterning during maize leaf development.

M L Hernandez1, H J Passas, L G Smith

  • 1Department of Biology, University of North Carolina at Chapel Hill 27599, USA.

Developmental Biology
|January 22, 2000
PubMed
Summary
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In maize, cell lineage does not determine the linear arrangement of stomata and bulliform cells. Positional information, not cell history, guides epidermal cell differentiation patterns in these grasses.

Area of Science:

  • Plant developmental biology
  • Molecular genetics
  • Cellular patterning

Background:

  • Specialized epidermal cells in plants, like maize, form semi-ordered patterns.
  • In grasses, stomata and bulliform cells differentiate linearly within the leaf epidermis.
  • Mechanisms for epidermal patterning include cell lineage and positional information.

Purpose of the Study:

  • To investigate the role of cell lineage in the linear patterning of stomata and bulliform cells in maize.
  • To test predictions of clonal origin hypotheses for epidermal cell differentiation.
  • To determine whether lineage or positional information primarily directs maize epidermal patterning.

Main Methods:

  • Marking epidermal cell clones in juvenile and adult maize leaves using transposon excision (dSpm and Ds2).

Related Experiment Videos

  • Analyzing the spatial relationship between marked clones and patterns of stomata and bulliform cells.
  • Evaluating whether observed clone patterns align with lineage-dependent patterning models.

    • Main Results:

    • The majority of analyzed cell clones did not conform to predictions based on cell lineage.
    • Observed clone distributions failed to support hypotheses where lineage dictates stomatal and bulliform cell patterning.
    • Results indicate a significant deviation from lineage-based explanations for these patterns.

    Conclusions:

    • Cell lineage is not the primary factor responsible for the linear patterning of stomata and bulliform cells in maize.
    • Positional information is strongly implied as the driving force behind epidermal differentiation patterns in maize.
    • This finding contrasts with dicotyledonous plants where lineage plays a role in some epidermal cell patterning.