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THE PLANT CELL, Vol 3, Issue 2 115-125, Copyright © 1991 by American Society of Plant Biologists
Expression Patterns of myb Genes from Antirrhinum Flowers
D. Jackson, F. Culianez-Macia, A. G. Prescott, K. Roberts and C. Martin
Departments of Cell Biology and Genetics, John Innes Institute, John Innes Centre for Plant Science Research, Colney Lane, Norwich NR4 7UH, United Kingdom
Six genes that contain sequence encoding the DNA binding domain of the Myb
oncoproteins have been isolated from a cDNA library prepared from
Antirrhinum majus (snapdragon) flowers using oligonucleotide probes
directed against part of this domain. The derived amino acid sequences of
these genes reveal acidic domains in their carboxy termini, suggesting that
they might act as transcriptional activators. Analysis of their expression
patterns with respect to organ specificity, floral differentiation, and
response to light suggests that these genes are not involved in controlling
anthocyanin biosynthesis, unlike the characterized myb-related genes C1 and
Pl from maize. One of the genes is expressed mainly in the nectary and the
transmitting tract of the style, two major secretory tissues of the flower,
suggesting that the function of this gene is related to active carbohydrate
secretion. We conclude that plants contain a number of myb-related
transcriptional activators involved in a diversity of gene regulation.
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