Abstract
Ulva, as the main genera involved in green tides in the Yellow Sea, has attracted serious concern in China. Especially,Ulva proliferais one of the causative species of the occurring. This paper focused on the complete sequences analyses of ITS, 18S, and the combined data to determine phylogenetic relationships among taxa currently attributed toUlva,Monostroma, and some other green algal. The samples are all concluded in the area of Yellow Sea, China. The results showed the content of G+C in 18S was approximately concentrated upon 49% in average of 19 subjects while the ITS region content of base G and C is obviously higher than A and T. Comparing the ITS and 18S rDNA sequences obtained in this paper to other species retrieved from GenBank, the genetic distance and the ratio of sequence divergence reflect thatU. pertusaandU. proliferahad closer genetic relationship with an 18S rDNA, which had genetic distance of 0.007 while ITS had further genetic distance. According to further comparison,Ulva proliferahas closest genetic distance withChloropelta caespitosa(0.057) andUlva californica(0.057), which is a reverification coincidedChloropelta,Enteromorpha, andUlvaare not distinct genera.
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