Journal
DEVELOPMENT
Volume 135, Issue 8, Pages 1503-1512Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.016303
Keywords
brown algae; Ectocarpus siliculosus; immediate upright; initial-cell division; life cycle; phaeophyceae
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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.
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