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Eukaryotic Cell, August 2005, p. 1317-1327, Vol. 4, No. 8
1535-9778/05/$08.00+0     doi:10.1128/EC.4.8.1317-1327.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Mating Type Loci of Sporisorium reilianum: Novel Pattern with Three a and Multiple b Specificities

Jan Schirawski, Bernadette Heinze, Martin Wagenknecht, and Regine Kahmann*

Max-Planck-Institut für Terrestrische Mikrobiologie, Karl-von-Frisch-Strasse, 35043 Marburg, Germany

Received 22 February 2005/ Accepted 20 May 2005

Sporisorium reilianum and Ustilago maydis are two closely related smut fungi, which both infect maize but differ fundamentally in their mode of plant invasion and site of symptom development. As a prelude to studying the molecular basis of these differences, we have characterized the mating type loci of S. reilianum. S. reilianum has two unlinked mating type loci, a and b. Genes in both loci and adjacent regions show a high degree of synteny to the corresponding genes of U. maydis. The b locus occurs in at least five alleles and encodes two subunits of a heterodimeric homeodomain transcription factor, while the a locus encodes a pheromone/receptor system. However, in contrast to that of U. maydis, the a locus of S. reilianum exists in three alleles containing two active pheromone genes each. The alleles of the a locus appear to have arisen through recent recombination events within the locus itself. This has created a situation where each pheromone is specific for recognition by only one mating partner.

* Corresponding author. Mailing address: Max-Planck-Institut für Terrestrische Mikrobiologie, Abt. Organismische Interaktionen, Karl-von-Frisch-Strasse, D-35043 Marburg, Germany. Phone: (49) 6421-178501. Fax: (49) 6421-178599. E-mail: kahmann{at}staff.uni-marburg.de.

Eukaryotic Cell, August 2005, p. 1317-1327, Vol. 4, No. 8
1535-9778/05/$08.00+0     doi:10.1128/EC.4.8.1317-1327.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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