Karyology and cytophotometric estimation of inter- and intraspecific nuclear DNA variation in four species of Porphyra (Rhodophyta)

New insights into the cryptic diversity of the North Atlantic–Mediterranean ‘Porphyra leucosticta’ complex:P. oliviisp. nov. andP. rosengurttii(Bangiales, Rhodophyta)

“…Geographical strains of P. leucosticta appear to be either sexual, asexual, with n ¼ 3 or n ¼ 4 or n ¼ 3-4 (Coll & de Oliveira Filho, 1977;Yabu, 1978;Kapraun & Freshwater, 1987;Kapraun et al, 1991;Lindstro¨m & Cole, 1992Gargiulo et al, 1994;Holmes & Brodie, 2005;Bartsch, pers. obs.).…”

“…They speculated that karyotypes with n ¼ 3 evolved by deletion of the shortest chromosome, number 4. However, Kapraun et al (1991) also proposed that the karyotype of n ¼ 3 in P. leucosticta and P. spiralis var. amplifolia evolved as a result of a fusion process rather than a deletion event.…”

Karyology and cytophotometric estimation of nuclear DNA content variation inGracilaria, GracilariopsisandHydropuntia(Gracilariales, Rhodophyta)

“…Polysiphonia with 0.8-2.2 pg have the largest 2 C genomes determined for red algae (Kapraun et al, 1991(Kapraun et al, , 1993.…”

Paths toward Algal Genomics

“…or.jp/en/plant/porphyra/EST/). The size of the Porphyra genome has been estimated to be 300 Mb (Kapraun et al, 1991), which is only twice the size of the genome of Arabidopsis. The genus has fossil records that extend back over 500 million years (Campbell, 1980;Xiao et al, 1998), while Bangia, a sibling genus of Porphyra, is represented by fossils that are 1.2 billion years old (Butterfield, 2000).…”