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First published online 13 March 2008
doi: 10.1242/dev.016303

Development 135, 1503-1512 (2008)
Published by The Company of Biologists 2008
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Life-cycle-generation-specific developmental processes are modified in the immediate upright mutant of the brown alga Ectocarpus siliculosus

Akira F. Peters1,2,*, Delphine Scornet1,2, Morgane Ratin1,2, Bénédicte Charrier1,2, Annabelle Monnier3, Yves Merrien1,2, Erwan Corre4, Susana M. Coelho1,2 and J. Mark Cock1,2,{dagger}

1 UPMC Université Paris 06, The Marine Plants and Biomolecules Laboratory, UMR 7139, Station Biologique de Roscoff, Place Georges Teissier, BP74, 29682 Roscoff Cedex, France.
2 CNRS, UMR 7139, Laboratoire International Associé Dispersal and Adaptation in Marine Species, Station Biologique de Roscoff, Place Georges Teissier, BP74, 29682 Roscoff Cedex, France.
3 Microarray Platform, OUEST-Génopole, Université de Rennes 1-Faculté de Médecine, Campus de Villejean, 35043 RENNES Cédex, France.
4 Computer and Genomics resource Centre, FR 2424, Station Biologique de Roscoff, Place Georges Teissier, BP74, 29682 Roscoff Cedex, France.

{dagger} Author for correspondence (e-mail: cock{at}sb-roscoff.fr)

Accepted 31 January 2008

Development of the sporophyte and gametophyte generations of the brown alga E. siliculosus involves two different patterns of early development, which begin with either a symmetric or an asymmetric division of the initial cell, respectively. A mutant, immediate upright (imm), was isolated that exhibited several characteristics typical of the gametophyte during the early development of the sporophyte generation. Genetic analyses showed that imm is a recessive, single-locus Mendelian factor and analysis of gene expression in this mutant indicated that the regulation of a number of life-cycle-regulated genes is specifically modified in imm mutant sporophytes. Thus, IMM appears to be a regulatory locus that controls part of the sporophyte-specific developmental programme, the mutant exhibiting partial homeotic conversion of the sporophyte into the gametophyte, a phenomenon that has not been described previously.

Key words: Brown algae, Ectocarpus siliculosus, Immediate upright, Initial-cell division, Life cycle, Phaeophyceae


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