Texas Tech University


On the cover: An Arabidopsis harlequin mutant seedling, showing the phenotype of checkered GUS staining in the epidermis driven by the carrot Dc3 promoter. The Dc3 gene is inducible by ABA (and auxin in roots) and encodes a late-embryogenesis-abundant protein; high levels of GUS staining seen in the older, non-expanding tips of cotyledons demonstrate the expected embryo-specific Dc3::GUS transgene expression. The unexpected ectopic expression of GUS in the mutant epidermis resembles a harlequin, the conventional buffoon of the commedia dell'arte and muse of the artist Pablo Picasso (inset; © Bild Kunst). The word harlequin is lexically derived from King Herla (Wodin) of Anglo-Saxon mythology, the Norse god of wisdom, war, art, culture, and creator of the cosmos and controller of human destiny. Further characterization of the pleiotropic harlequin and short blue root monogenic mutants described on page 93- 105 may provide insights into the relationship of hormone and stress-regulated gene expression to morphogenesis and plant development. Plant Molecular Biology 49, pp. 93-105.


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