Effects of Light, Salinity and Temperature on Germination Characteristics of Surfgrass, Phyllospadix japonicus and P. iwatensis Seeds

다국어 초록 (Multilingual Abstract)

Surfgrass (Phyllospadix spp.) is a marine flowering plant that attaches to the bedrock of the Pacific Ocean, where the tide is fast and the waves are strong. In Korea, two species of surfgrass are mainly found on the east coast. Phyllospadix japonicus is present throughout the east coast, whereas P. iwatensis is mainly present on the central east coast. The germination requirements of these two surfgrass species were studied in relation to the light, salinity, and temperature treatments. In the light test, both species showed significantly higher percentage germination (PG), faster daily germination rate (DGR), and shorter mean time-to-germinate (MTG) under light conditions than those under dark conditions. In the salinity and temperature experiments, the highest PGs for P. japonicus and P. iwatensis were 95.6 ± 4.4% and 82.2 ± 1.1%, respectively, at 30 psu and 7 °C. The maximum DGRs of P. japonicus and P. iwatensis were 1.95 ± 0.04 seeds d−1 and 1.43 ± 0.05 seeds d−1, respectively, at 15 psu and 17 °C. MTGs of both species were the shortest at 15 psu at all temperatures, and increased as salinity increased. The two surfgrass species showed a similar germination tendency, but P. japonicus showed a higher PG, faster DGR, and shorter MTG than P. iwatensis. Owing to these differences in germination characteristics, P. japonicus may have an advantage for occupying a wider bedrock area in the East Sea coast of the Korean Peninsula.

참고문헌 (Reference)

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