TITLE

Morphology, molecular phylogeny and taxonomy of Nitella comptonii (Charales, Characeae)

AUTHOR(S)
Sakayama, Hidetoshi; Arai, Shogo; Nozaki, Hisayoshi; Kasai, Fumie; Watanabe, Makoto M.
PUB. DATE
July 2006
SOURCE
Phycologia;Jul2006, Vol. 45 Issue 4, p417
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The taxonomic status of Nitella comptonii (Charales, Characeae) is not well understood because this species has not been recorded since the early 20th century, and detailed examinations of fully mature individuals have not been performed. Recently, we collected fully mature N. comptonii from the Okinawa Islands in Japan. These exhibited a distinctive fertile spherical head in the axils, and their vegetative and reproductive structures were consistent with those in the original description of the species. In 1965 in his ‘A revision of the Characeae’, R. D. Wood assigned N. comptonii as a subspecies of N. pseudoflabellata. In our study, scanning electron microscopic analysis of N. comptonii oospores revealed that external and internal oospore morphology of N. comptonii was clearly different from that of N. pseudoflabellata. In addition, multiple DNA phylogeny using the concatenated sequences of the chloroplast rbcL, atpB, and psaB genes, and nuclear 5.8S ribosomal RNA gene and internal transcribed spacer regions, clearly separated N. comptonii from N. pseudoflabellata. Therefore, N. comptonii should be classified as a separate species.
ACCESSION #
22378275

 

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