ISHS Acta Horticulturae 440: International Symposium on Plant Production in Closed Ecosystems
CARBON DIOXIDE FIXATION RATE CHARACTERISTICS OF A GRAFTED SEEDLING IN AN ACCLIMATION PROCESS |
| Authors: | Y. Nishiura, H. Murase, N. Honami, T. Taira, A. Wadano |
| Keywords: | acclimation, carbon dioxide fixation, grafting, joining rate, non-destructive measurement |
| Abstract:
In general, low light intensity or complete darkness, high humidity, mild temperature, and a gentle wind flow are used in traditional acclimation in order to prevent the seedlings dehydrating from excess transpiration. In this study, an enclosed acclimation system for fruit/vegetable seedlings was utilized. In a previous study, the joining strength between the scion and the stock was measured by a pull tester. However, in the pull tester method only mechanical joining rate was measured. Thus, physiological data (such as photosynthesis, respiration and transpiration rates, and nutrient translocation) is needed in order to determine the joining rate of grafted seedlings. To be able to obtain information relating to the physiological data, a non-destructive technique involving measurement of carbon dioxide concentration was used. An equipment for the measurement of carbon dioxide concentration was developed; it effectively functioned. The results showed that the joining rate of acclimating grafted seedlings related to the rate of carbon dioxide fixation. Hence, carbon dioxide fixation rate is a useful indicator of the rate of joining of grafted seedlings. The results also showed that the average carbon dioxide fixation rate for non-grafted seedlings was 77.68 ppm/h/cm2, a value about 3 times larger than that for grafted seedlings. | |
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