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要旨:
Phaeophyceae is a clade of eukaryotic multicellular photosynthetic organisms phylogenetically very distant from the well-studied green lineage. Most brown algal species alternate a diploid sporophytic and a haploid gametophytic phase during their life cycle. However, generation identity is independent of ploidy as haploid sporophytes can develop through parthenogenesis. Previous studies, in Ectocarpus, identified genes that control the developmental program of the sporophyte generation. In two nearly isomorphic species Ectocarpus sp. 7 and Dictyota dichotoma, we used transcriptomic data along the development to analyse gene co-expression during the life cycle. Furthermore, the relative importance and complexity of these generations varies across the brown algal phylogenetic tree. To determine whether generation-biased genes are conserved among brown algae, we analysed RNAseq data from adult stages of ten phylogenetically diverse brown algal species with a high diversity of life cycles.
