Abstract
The algal respiration as affected by some growth substances and nitrogen compounds was investigated by manometric technique at 20°C or 25°C. Additional examination was also made on the effect of drying and pH. The following results were obtained. 1) Indoleacetic acid and gibberellin, 10mg/l or more, added to sea water enhanced the respiration to some extent whereas naphthaleneacetic acid was scarcely effective. 2) Addition of NH4C1 (10-2 TO 10-1 M) remarkably enhanced the respiration whereas it was reduced by NaNO3 and was only slightly enhanced by urea. 3) Sporocarpic region of the alga showed respiration rate about twice as high as that of vegetative region. 4) Oxygen uptake by the alga steadily declined accompanying the proceeding loss of water by exposure to air. 5) Excessively dried alga eventually showed measurable release of a sort of gas other than CO2. Respiration recovered rapidly when such algal body was returned to sea water. 6) Changing pH from 6.1 to 8.0 by means of M/30 phosphate buffer did not affect the respiration significantly, whereas that from 8.9 to 10.2 with M/10 bicarbonate-carbonate mixture showed marked influence.
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