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奥村, 真子 ; 三木, 理 ; 上野, 聡浩 ; 小杉, 知佳 ; 吉村, 航 ; 加藤, 敏朗 ; Okumura, Chikako ; Miki, Osamu ; Ueno, Akihiro ; Kosugi, Chika ; Yoshimura, Ko ; Kato, Toshiaki
概要:
金沢大学理工研究域サステナブルエネルギー研究センター<br />The present study is an attempt for assessing the relationship between iron deficiency a
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nd discoloration in Undaria pinnatifida sporophytes. First, thallus discoloration and the decrease in photosynthetic pigment contents were examined in Undaria pinnatifida by employing an indoor iron-deficiency experiment. When Undaria pinnatifida sporophytes were cultured under iron-deficient conditions, which the iron concentrations were between 2 and 5 μg/L, the growth decreased, the thalli became discolored, and the photosynthetic pigment contents decreased. Iron deficiency caused the sporophytes to become lighter (L*) and less red (a*). Therefore, it appears that iron deficiency induces the discoloration of Undaria pinnatifida sporophytes, similar to how nitrogen and phosphorus deficiencies perform. Next, we investigated how the mechanism involved in the addition of iron affects the discolored Undaria pinnatifida sporophytes due to iron deficiency by performing an indoor iron-addition experiment. Undaria pinnatifida sporophyte growth, thallus color, and photosynthetic pigment content were all restored by the addition of dissolved iron solution, which the concentrations were between 10 and 50 μg/L. Iron addition made the sporophytes recover their lightness (L*) and redness (a*). In addition, the color was restored more quickly as the amount of added iron was increased. The discoloration of iron-deficient Undaria pinnatifida sporophytes can thus be restored by iron addition.
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Miki, Osamu ; Okumura, Chikako ; Marzuki, Mawardi ; Tujimura, Yusuke ; Fujii, Takahito ; Kosugi, Chika ; Kato, Toshiaki ; 三木, 理 ; 奥村, 真子
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The brown seaweed Sargassum horneri (Sargassaceae) is important for marine environment conservation. It could be used fo
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r a food material, medical applications, and future biofuel production. We compared the growth of S. horneri cultures under single wavelength blue and red light during the germling and immature stages. The growth rate based on the thallus area of S. horneri during the germling stage was faster under blue LED light than under red LED light. Furthermore, based on the wet weight of S. horneri, during the immature stage, blue LED light resulted in a faster growth rate than red LED light. Moreover, during the immature stage, compared with red LED light, blue LED light tended to increase the content of photosynthetic pigments. We conclude that use of blue LED light in indoor tanks during the germling and immature stages will improve the efficiency of S. horneri culture. © 2016 Springer Science+Business Media Dordrecht<br />Embargo Period 12 months
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Miki, Osamu ; Nagai, Taichi ; Marzuki, Mawardi ; Okumura, Chikako ; Kosugi, Chika ; Kato, Toshiaki
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To aid in the restoration of coastal barren ground areas, it is important to clarify the effects of chelated iron on the
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growth of seaweed. In particular, for the further development of practical methods to promote seaweed growth, Fe-binding organic ligands, such as humic substances (HSs) composed of humus materials, rather than Fe-binding inorganic ligands, such as ethylenediaminetetraacetic acid (EDTA), should be investigated. In this study, the effects of an Fe fertilizer, made from HSs and steelmaking slag, on the growth of the brown alga Sargassum horneri at the germling and immature stages were examined. The addition of the Fe fertilizer eluate containing Fe organic ligand complexes clearly promoted the growth of S. horneri at the germling and immature stages. It was also clear that the effect of Fe concentration in the Fe fertilizer eluate on the growth rate was almost the same as that of Fe–EDTA. Moreover, the addition of the Fe fertilizer eluate had a great effect on the brown color of S. horneri thalli and promoted the increased content of photosynthetic pigments, such as chlorophyll a. Based on these experimental results, the application of the Fe fertilizer containing Fe organic ligand complexes is expected to become an effective method for the restoration of the barren ground phenomenon in Fe-deficient coastal areas. © 2015 Springer Science+Business Media Dordrecht<br />Embargo Period 12 months
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Miki, Osamu ; Okumura, Chikako ; Marzuki, Mawardi ; Tujimura, Yusuke ; Fujii, Takahito ; Kosugi, Chika ; Kato, Toshiaki
概要:
The original version of this article unfortunately contained a mistake. Figure 7 was incorrect. The correct Figure is given below: (Figure presented). © 2017, Springer Science+Business Media Dordrecht.<br />Embargo Period 12 months
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