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Regional and cell-specific gene expression patterns during petal development.

G N Drews1, T P Beals, A Q Bui

  • 1Department of Biology, University of California, Los Angeles 90024-1606.

The Plant Cell
|November 1, 1992
PubMed
Summary
This summary is machine-generated.

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Gene expression in tobacco petals reveals two mRNA classes, one specific to the limb region. These limb-specific genes are regulated transcriptionally for precise spatial and temporal control during flower development.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Tobacco petal development involves complex gene expression regulation.
  • Understanding gene expression patterns is crucial for elucidating floral organogenesis.

Purpose of the Study:

  • To investigate gene expression patterns during tobacco petal development.
  • To identify and characterize specific mRNA classes in petal tissues.
  • To determine the regulatory mechanisms controlling petal gene expression.

Main Methods:

  • Differential screening of petal mRNA populations.
  • Analysis of mRNA localization within petal tissues (epidermal and mesophyll layers).
  • Runoff transcription assays and reporter gene studies (chimeric beta-glucuronidase) to assess transcriptional regulation.

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Main Results:

  • Two distinct classes of petal messenger RNA (mRNA) were identified with elevated levels compared to other organs.
  • One mRNA class was uniformly distributed between the corolla tube and limb, while the second class accumulated preferentially in the limb region.
  • Limb-specific mRNAs exhibited temporal regulation, peaking before flower opening, and were localized to epidermal or mesophyll cells, with abrupt concentration changes at the limb/tube border.
  • Preferential accumulation of limb-specific mRNAs was observed in the upper corolla region early in development and in the unpigmented limb of Nicotiana sylvestris.
  • Organ, cell, and region-specific gene expression in petals is primarily controlled at the transcriptional level.

Conclusions:

  • Transcriptional processes coordinately regulate regional expression patterns of limb-specific genes during corolla development.
  • Transcriptional processes individually regulate cell-specific expression of these genes.
  • Gene expression control during petal development is a sophisticated, multi-layered process involving both coordinated and individual transcriptional regulation.