[논문]Taxonomic Note of Polysiphonia pacifica (Ceramiales, Rhodophyta) Complex with Focus on Pacific Isolates

Kim, Myung-Sook; Yang, Eun-Chan

doi:10.4490/algae.2005.20.1.015

Taxonomic Note of Polysiphonia pacifica (Ceramiales, Rhodophyta) Complex with Focus on Pacific Isolates 원문보기

Algae, v.20 no.1, 2005년, pp.15 - 23

Kim, Myung-Sook (Research Institute for Basic Sciences, Pusan National University) , Yang, Eun-Chan (Department of Biology, Chungnam National University)

Abstract ▼ AI-Helper

Polysiphonia pacifica is rhodomelaceous red algal species that includes five varieties in Pacific Ocean: P. pacifica var. delicatula, P. pacifica var. distans, P. pacifica var. determinata, P. pacifica var. disticha, and P. pacifica var. gracilis. We here report morphology and phylogeny of P. pacifica to confirm the relationships among previously described varieties as a loan of type specimens from US and to assess phylogenetic relationships of closely related species using plastid protein-coding rbcL gene. Polysiphonia pacifica is distinguished by having creeping filaments attached by unicellular rhizoids not cut off by cross walls, four pericentral cells, ecorticate, trichoblasts rare, ultimate branchlets attenuate at the tip but not pungent, and tetrasporangia in long straight series in the ultimate branchlets. The protein-coding plastid rbcL gene sequence data show that P. pacifica is distinctly different from the superficially similar species, P. morrowii and P. stricta. However, the rbcL sequences of P. pacifica var. pacifica and var. disticha are identical though they have morphological variation.

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0b10 (Swofford 2002). Full heuristic search was carried out with 1,000 replicates, random addition sequences of taxa, keeping best trees only, holding 1 trees at each step, tree bisection-reconnection (TBR) branch swapping, collapsed of zero length branches and MULTREES on. Bootstrap values (BtMP) were calculated performing 1,000 replicates with following options selected: heuristic search, TBR branch swapping, collapse of zero length branches, and random sequence addition with one replicate.
The Akaike information criterion (AIC) selected GTR + I model as the best-fitting model for the data. Tree likelihoods were estimated using a heuristic search with 100 random addition sequence replicates, and TBR branch swapping. To test the stability of monophyletic groups, bootstrap (BtML) analyses were undertaken with 500 replicates.

대상 데이터

The PCR products were purified using a High Pure PCR Product Purification Kit (Roche), in accordance with the users' guide. The sequences of the forward and reverse strands were determined for all taxa using an ABI PRISM™ 377 DNA Sequencer (Applied Biosystems) at Research Center, Chungnam National University, Daejon, Korea. We aligned and reconciled complementary chromatograms using Sequence Navigator v.
5. Voucher specimens used in this study were deposited in the herbarium of Chungnam National University (CNUK), Daejon, Korea.

성능/효과

13). The closest relationship of P. pacifica and P. stricta was supported by relatively strong BtMP (83%) and Bp (0.96), despite its decline in BtML (60%). The monophyly of P.
97 Bp). The genus Polysiphonia produced a strong supported clade (99% for BtML, and maximum for the BtMP and Bp).
0 Bp), respectively. The monophyly of P. morrowii was supported by strong support values (97% for BtML, 99% for BtMP, and 1.0 for Bp). Polysiphonia sp.
96), despite its decline in BtML (60%). The monophyly of P. pacifica and that of P. stricta were supported by maximum support values (100% for BtML and BtMP and 1.0 Bp), respectively. The monophyly of P.
stricta have a few sequence differences. The rbcL sequences from the five samples of P. morrowii differed by 1 nucleotides (average p distance = 0.03%) and five of P. stricta differed by from 0 to 3 nucleotides (average p distance = 0.1%). Pairwise sequence divergence comparison among three Polysiphonia species ranged from 3.

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