Genetic diversity and distribution pattern of economic seaweedsPyropia yezoensisandPy. suborbiculata(Bangiales, Rhodophyta) in the northwest Pacific

摘要

Pyropia yezoensisandPy. suborbiculatahave been traditionally important for marine aquaculture as food resources in the northwest Pacific region. We conducted molecular analyses using plastidrbcL and mitochondrial COI-5P markers to identify their genetic diversity hotspot using samples collected from various locations of the northwest Pacific region as well as genetic information obtained from a public repository, representing specimens around the world. In therbcL result,Py. yezoensiswas separated into 19 haplotypes, andPy. suborbiculatawas separated into 26 haplotypes. In COI-5P, 5 and 14 haplotypes were revealed inPy. yezoensisandPy. suborbiculata, respectively. We discovered a large number of haplotypes ofPy. yezoensisin Hokkaido of Japan and high genetic diversity ofPy. suborbiculatain the East Sea. Interestingly,Py. yezoensisandPy. suborbiculatashowed unique haplotypes in the eastern coast of Korea. The distinction of haplotype composition between the East Sea and those of other regions in the northwest Pacific could be due to the divergence from environmental isolation of the East Sea during the Last Glacial Maximum. Our results show that the East Sea including Hokkaido of Japan is an important genetic diversity hotspot ofPy. yezoensisandPy. suborbiculataand needs to be further monitored for conservation.