Saga Prefectural Ariake Fisheries Research and Development Center Saga Japan

Japan

Saga Prefectural Ariake Fisheries Research and Development Center Saga Japan

Japan
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Watanabe Y.,Japan Society for the Promotion of Science | Morikawa T.,Saga Prefectural Ariake Fisheries Research and Development Center Saga Japan | Mine T.,Saga Prefectural Ariake Fisheries Research and Development Center Saga Japan | Kawamura Y.,Saga Prefectural Ariake Fisheries Research and Development Center Saga Japan | And 2 more authors.
Phycological Research | Year: 2017

The chronological change of photosynthetic efficiency in a frozen storage treatment of the Japanese Nori cultivation industry was examined in the cultivated red alga, Pyropia yezoensis f. narawaensis (Saga-#5 Strain, Bangiales) by using pulse-amplitude fluorometry. During the desiccation process that was conducted after the nursery cultivation season in November, the maximum quantum yield (F v/F m) of the gametophytic sporelings growing on the Nori-net decreased monotonically with decreasing absolute water content (AWC), and was around 0.1 at 20% AWC. During frozen storage of the Nori-net, the F v/F m of the frozen gametophyte was low but stable, and ranged between 0.10±0.02 SD and 0.14±0.05 SD. The magnitude of F v/F m for the gametophyte of the freezing treatment, after 10min and 3h of immersion in seawater, recovered quickly. After 10min and 3h of immersion, these values were 0.29±0.12 SD and 0.47±0.05 SD during the 14days of freezing treatment, and 0.15±0.02 SD and 0.29±0.04 SD after 71days of freezing treatment, and suggest that the ability to recover gradually decreased as the storage duration increased. The response of F v/F m from general cultivation (i.e., directly cultivated from the nursery cultivation season) and those after 47days of freezing were almost identical, suggesting that the current Nori -net frozen storage period (6 or 7weeks) was not detrimental to the gametophyte. © 2017 Japanese Society of Phycology.

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