Molecular phylogeny of the brown algal genera Akkesiphycus and Halosiphon (Laminariales), resulting in the circumscription of the new families Akkesiphycaceae and Halosiphonaceae

Phylogeny of Alariaceae, Laminariaceae, and Lessoniaceae (Phaeophyceae) Based on Plastid-Encoded RuBisCo Spacer and Nuclear-Encoded ITS Sequence Comparisons

“…We concur with Reviers and Rousseau (1999) that the three advanced kelp families should be considered as the Laminariales sensu stricto, exclusive of the primitive kelp families such as the Pseudochordaceae, Chordaceae, Phyllariaceae, and recently described Akkesiphycaceae (Kawai and Sasaki, 2000). Members of the primitive kelp families need to be analyzed with molecular markers to test this hypothesis (e.g., Kawai and Sasaki, 2000).…”

“…The monophyly of these three families is 235 PHYLOGENY OF ALARIACEAE, LAMINARIACEAE, AND LESSONIACEAE strongly supported by synapomorphic characters such as the absence of a stigma in zoospores, dioecious and sexually dimorphic gametophytes, lamoxirene as the sexual pheromone, conducting systems in the sporophytes, and unicellular paraphyses (Kawai and Kurogi, 1985). We concur with Reviers and Rousseau (1999) that the three advanced kelp families should be considered as the Laminariales sensu stricto, exclusive of the primitive kelp families such as the Pseudochordaceae, Chordaceae, Phyllariaceae, and recently described Akkesiphycaceae (Kawai and Sasaki, 2000). Members of the primitive kelp families need to be analyzed with molecular markers to test this hypothesis (e.g., Kawai and Sasaki, 2000).…”

“…This order currently contains seven families: the Akkesiphycaceae, Pseudochordaceae, Chordaceae, Phyllariaceae, Alariaceae, Laminariaceae, and Lessoniaceae. The former four families are easily distinguished using morphological characters and are regarded as "primitive" kelps (Wynne and Loiseaux, 1976;Kawai and Kurogi, 1985;Henry and South, 1987;Maier, 1995;Boo et al, 1999;Kawai and Sasaki, 2000). The Alariaceae, Laminariaceae, and Lessoniaceae share many characteristics such as the absence of an eyespot in the zoospore, and the presence of the hormone lamoxirene and of conductive tissues, which have been regarded as apomorphic features .…”

Taxonomic revision of the genus Chorda (Chordaceae, Laminariales) on the basis of sporophyte anatomy and molecular phylogeny

“…on the ba,sis of a inoleciilar phylogenelic study tising internal transcribed spacer (ITS)-3.8S rDNA and /•Z:'tL-spacer DNA sequence data. Kawai et al (2000) demonstrated the distinctness of C. rigida. as well as the considerable genetic diversity wiihin the Atlantic and Pacilic populations of C. jitiini.…”

Detection of Laminariaceae Species Based on PCR by Family-specific ITS Primers

“…Differences in the morphological characteristics including the presence of mucilaginous organs in the sporophyte, lack of an eyespot in meiospores, and uniflagellation of the sperm exist among the families in the order Laminariales (Kawai and Sasaki, 2000). The Laminariaceae family is characterized by the presence of a distinct stipe, paraphyses without hyaline appendages, and the absence of outgrowths or splitting of the transition zone.…”