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- W1985636693 abstract "Among five species of the genus Plocamium present in Japan, P. cartilagineum, P. recurvatum and P. telfairiae show similar blade morphology, and intermediates exist between them. We investigated the diversity and evolutionary relationships of these Plocamium species using morphological observations, estimation of intracellular pH and analysis of Rubisco spacer sequences. Although P. recurvatum is characterized by the presence of extremely recurved branchlets, most of the specimens examined also have linear or slightly reflexed branchlets in the same thallus. Plocamium cartilagineum is not clearly distinguished from P. telfairiae by the conventional diagnostic characters such as width of main axes, number of branchlets in alternate series and size of the lowermost branchlet. Intracellular pH of these species is estimated to be 1.2–6.6 and is variable within a species. Three haplotypes in P. cartilagineum, two in P. recurvatum and eight in P. telfairiae are recognized on the basis of the Rubisco spacer sequences, and most of these haplotypes show specific intracellular pH. The molecular phylogenetic analyses demonstrate three major clades in the Japanese Plocamium species: P. cartilagineum, one haplotype of P. recurvatum and four of P. telfairiae in one clade (A); P. ovicorne and P. serratulum in another (clade B); the remaining haplotype of P. recurvatum and four haplotypes of P. telfairiae in clade C. Clade C contains only the haplotypes showing strong acidity, whereas clade A is composed of both strongly acidic and weakly acidic or neutral haplotypes. These results suggest that morphological homoplasy occurred in P. recurvatum and P. telfairiae and that physiological properties such as intracellular pH may be informative and contribute to our understanding of the relationship of the Japanese Plocamium species." @default.
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- W1985636693 date "2004-07-01" @default.
- W1985636693 modified "2023-10-05" @default.
- W1985636693 title "Morphological homoplasy in Japanese Plocamium species (Plocamiales, Rhodophyta) inferred from the Rubisco spacer sequence and intracellular acidity" @default.
- W1985636693 doi "https://doi.org/10.2216/i0031-8884-43-4-383.1" @default.
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