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THE PLANT CELL, Vol 4, Issue 11 1383-1404, Copyright © 1992 by American Society of Plant Biologists
Regional and Cell-Specific Gene Expression Patterns during Petal Development
G. N. Drews, T. P. Beals, A. Q. Bui and R. B. Goldberg
Department of Biology, University of California, Los Angeles, California 90024-1606
We investigated gene expression patterns that occur during tobacco petal
development. Two petal mRNA classes were identified that are present at
elevated levels relative to other organs. One class is represented equally
in the unpigmented tube and pigmented limb regions of the corolla. The
other class accumulates preferentially within the limb region.
Limb-specific mRNAs accumulate at different times during corolla
development, peak in prevalence prior to flower opening, and are localized
in either the epidermal cell layers or the mesophyll. The epidermal- and
mesophyll-specific mRNAs change abruptly in concentration within a narrow
zone of the limb/tube border. Preferential accumulation of at least one
limb-specific mRNA occurs within the corolla upper region early in
development prior to limb maturation and pigment accumulation.
Limb-specific mRNAs also accumulate preferentially within the unpigmented
corolla limb region of Nicotiana sylvestris, a diploid progenitor of
tobacco. Runoff transcription studies and experiments with chimeric
[beta]-glucuronidase genes showed that petal gene organ, cell, and region
specificities are controlled primarily at the transcriptional level. We
conclude that during corolla development transcriptional processes act
coordinately on limb-specific genes to regulate their regional expression
patterns, but act individually on these genes to define their cell
specificities.
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