A study on the production of conchosporangia in the conchocelis phase of Porphyra angusta Okamura et Ueda

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Abstract
Production of conchosporangia in the cultured conchocelis phase of P. angusta was studied under 144 combinations of temperature (18, 20, 22, 25, 27 and 29.degree. C), light intensity (1000, 2000, 3000 and 4000 lx) and photoperiod: .**GRAPHIC**. Conchocelis grown at 18.degree. C did not produce sporangia, but grew vegetatively only. Conchosporangia were formed at 20, 22, 25, 27 and 29.degree. C under all conditions, and the number of conchocelic colonies with sporangia increased with increase in temperature, irrespective of light intensity and photoperiod. At 22 and 25.degree. C, high light intensity stimulated the production of conchosporangia, but the effect of light intensity was not apparent at 20, 27 and 29.degree. C. Photoperiod did not affect the formation of conchosporangia. Temperature also affected the shape and the abundance of conchosporangia produced on a conchocelis colony. The number of sporangia also increased as the temperature increased.