김屬(Porphyra) 3種의 패각사상체 성숙 및 채묘에 미치는 조도의 영향

Maturation and seeding of shell-inhabiting conchocelis of Porphyra seriata, P. dentata and P. tenera

To advance seeding of conchospores of Porphyra dentata, P. seriata and P. tenera, the effects of light intensity and photoperiod on growth of shell-inhabiting conchocelis, and formation and maturation of conchosporangia were studied from May to October in 1998. Growth of shell-inhabiting conchocelis of these species was similar to one another in early culture under natural light intensity, photoperiod and room temperature; growth of P. dentata and P. seriata was higher than that of P. tenera at 800 lux from August to September; growth of these three species was similar to one another at 800 lux in October. The color of shell-inhabiting conchocelis of P. dentata and P. seriata was red and the color of P. tenera black, but all the species were reddish-purple after mid-september. Formation rate of conchosporangia was 90% or more in P. tenera, 70% in P. seriata and less than 40% in P. dentata at September. Maturation of conchosporangia under 500 and 800 lux was better than 1,500 lux in the three species. Numbers of released conchospores were more at 18℃ than at 22℃, and the short-day treatment(8L:16D) gave rise to promotion of conchospore release. Numbers of conchospore germlings attached 1 ㎝ long netting-twine after 30 days of seeding were 35 individuals in P. tenera, 10 individuals in P. seriata and 3 individuals in P. dentata. Attached germlings of P. seriata were increased after 45 and 60 days; it suggests that monospores might be released