Abstract
The present work was carried out to gain some knowledge on the effect of temperature on the growth of sporelings of laver. The sporelings (<21μin length) of Porphyra tenera KJELLM. var. tamatsuensis MUIRA lodged on the artificial “Kuremona” fiber were grown in 500ml Erenmeyer flasks containing 200ml of enriched sea water (SWII2)+PROVASOLI'S PII metals 10ml/l) at various temperatures under 9, 000lx of fluorescent light for 10hours daily for 16days. The results observed are summerized as follows;1) The sporelings of Porphyra can not grow, and die within 10days at temperatures higher than 30°C.2) The sporelings do not elongate and show abnormal shapes at 25°C, although they liberate many monospores.3) The optimal temperature for growth is about 20°C in the first stage, and the optimal temperature goes down as growth proceeds.4) The growth is very slow at 10°C. The cell division and growth are become inhibited completely at temperatures lower than 5°C.5) The sporelings produce many monospores at 15-25°C. The liberation of monospores is abundant at 20-25°C, and the best growth is obtained at 20°C.6) The swelling of the cell wall of sporelings, smilar to that found in the culture at low salinities, 1)also appeared in the sporelings cultured at 25°C.
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