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PLANT PHYSIOLOGY , Vol 114, Issue 3 969-979, Copyright © 1997 by American Society of Plant Biologists

GENE REGULATION AND MOLECULAR GENETICS

Sex Determination in Dioecious Silene Iatifolia (Effects of the Y Chromosome and the Parasitic Smut Fungus (Ustilago violacea) on Gene Expression during Flower Development)

C. P. Scutt, Y. Li, S. E. Robertson, M. E. Willis and P. M. Gilmartin
Centre for Plant Biochemistry and Biotechnology, The University of Leeds, Leeds LS2 9JT, United Kingdom

We have embarked on a molecular cloning approach to the investigation of sex determination in Silene Iatifolia Poiret, a dioecious plant species with morphologically distinguishable sex chromosomes. One of our key objectives was to define a range of genes that are up-regulated in male plants in response to Y chromosome sex-determination genes. Here we present the characterization of eight male-specific cDNA sequences and classify these according to their expression dynamics to provide a range of molecular markers for dioecious male flower development. Genetically female S. latifolia plants undergo a partial sex reversal in response to infection by the parasitic smut fungus Ustilago violacea. This phenomenon has been exploited in these studies; male-specific cDNAs have been further categorized as inducible or noninducible in female plants by smut fungus infection. Analysis of the organ-specific expression of male-specific probes in male and female flowers has also identified a gene that is regulated in a sex-specific manner in nonreproductive floral tissues common to both male and female plants. This observation provides, to our knowledge, the first molecular marker for dominant effects of the Y chromosome in nonreproductive floral organs.


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Copyright © 1997 by the American Society of Plant Biologists