LEE, Yung Nok (Dept. of Biology, Korea University) Changes in respiratory activity and the sensitivity to ultraviole light of Neurospora cells at different growing stages. Kor. Jour. Bot. Ⅵ (4) : 1-4. 1963.
Using conidia of Neurospora, changes in respiratory activities and the sensitivity to the ultraviolet light of the cells at different growing stages were measured by manometric methods, and the correlation between them was observed. Efficiency in the utilization of various carbon sources, such as, glucose, sucrose, maltose, starch and sodium acetate, in growth and exogenous respiration of N. crassa was also determined.
Growth rate of N. crassa was decreased considerably in the medium containing sodium acetate than in the glucose medium and was almost zero in the lactose medium, whereas the utilization of sucrose. maltose and starch was very high, as that of glucose. Respiratory activities of the cells veried considerably depending upon their different growing stages. Actively growing hyphae exhibited the greatest activity in exogenous glucose respiration, followed by germinating and activated conidia in decreasing order.
There was no proportional relationship between the dose of ultraviolet light irradiated and its effect on the respiratory activity of the cells, though the more the dose of ultraviolet light, the more the injuri. The sensitivity of the cells to ultraviolet light varied with the different respiratory activities of the cells linked to the deve1opmental stages. In general, the more actively glowing cells having high respiratory activities exhibited the more serious injury.
|