Life-cycle-generation-specific developmental processes are modified in theimmediate uprightmutant of the brown algaEctocarpus siliculosus

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Abstract
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 immmutant 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.