Abstract
The artificial lighting conditions which promoted growth of the gametophytes and sporophytes of brown alga Undaria pinnatifida were examined. The seaweed was subjected to continuous or intermittent white, blue, or red light. There were notable, but not significant, differences in gametophyte and sporophyte growth between continuous and intermittent (104 Hz) white light conditions. Gametophyte growth was promoted most notably by white, followed by blue light. Sporophyte growth length was promoted most notably under intermittent white light, while body length and blade area were promoted notably under continuous white light. Sporophytes under blue or red light withered considerably. The results showed that white light is more beneficial for growth of both U. pinnatifida gametophytes and sporophytes compared with blue or red light. Male and female gametophyte grew more robustly under white light regardless of whether the pattern was intermittent or continuous light. However, the results further indicated that overall continuous white light promoted growth to a greater degree than did intermittent white light. Finally, white light promoted U. pinnatifida sporophyte growth to a greater degree than blue or red light. Key words: Light wavelength, intermittent light, Undaria pinnatifida, seaweed culture, sporophyte growth.
Highlights
The development of light emitting diode (LED) devices in recent years has improved control of photo environments and resulted in great improvements to technologies for culturing plants and algae in artificial environments (Mori et al, 2002)
Watanabe (1997) reported that lettuce grew well under intermittent light conditions at a high frequency (100 Hz or more). These studies have suggested that the reason intermittent light promotes plant growth is that no light exposure is needed for the dark reaction period of photosynthesis (Park and Lee, 2000)
In this study, U. pinnatifida gametophyte and sporophyte growth were not promoted by intermittent light at a frequency of 104 Hz
Summary
The development of light emitting diode (LED) devices in recent years has improved control of photo environments and resulted in great improvements to technologies for culturing plants and algae in artificial environments (Mori et al, 2002). The brown alga Undaria pinnatifida is useful as a feed additive for fish farming and food for human, and is cultivated widely in coastal areas around East Asia (FAO, 2016). Field culture production is unstable when weather conditions are poor. To ensure stable production under an artificial environment, it is necessary to identify the most effective photo environment characteristics for cultivating U. pinnatifida, such as the optimal light intensity, irradiance rhythms, and wavelength
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