Abstract
Growth and photosynthesis in the blade of Saccharina sporophytes are strongly stimulated by blue light. However, little is known about the effect of blue light on the early development and longitudinal photosynthesis profile of Saccharina sporophytes. In this study, S. japonica sporelings were cultured under blue or red light for 8 weeks. Blue light affected longitudinal, tangential cell divisions and tissue differentiation early in sporophyte development. The number of latitudinal cells in the blade under blue light was over fivefold that under red light. In addition, the number of cell layers was higher in the growing point than in the blade under blue light, whereas sporelings grown under red light contained only a single cell layer. Under blue light, the photosynthetic capacities of the growing region, blade and stipe were similar, and the maximum relative electron transport rate was even lower in the growing point than in the blade. The longitudinal photosynthesis profile suggested that blue light stimulated the enzymes participating in light-independent carbon fixation in the growing point and accordingly was less dependent on high light irradiances. Collectively, the results indicated that blue light promotes the early development of S. japonica sporophytes, which was attributed to both photomorphogenetic responses and photosynthetic reactions.
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Acknowledgments
We are grateful to Dr. GC Wang (Institute of Oceanology, Chinese Academy of Sciences) for the use of PAM fluorometer, Dr. YG Wang and MJ Liao (Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences) for assistance with photography. This work was supported by the National Natural Science Foundation of China (No. 30901095), Project for Supporting National Development (No. 2006BAD01A13-10), the 863 Project of China (No. 2006AA10A406), and Special Fund for Basic Research of the Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences (No. 2009-ts-04).
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Communicated by U. Sommer.
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Wang, WJ., Sun, XT. & Wang, FJ. Effect of blue light on early sporophyte development of Saccharina japonica (Phaeophyta). Mar Biol 157, 1811–1817 (2010). https://doi.org/10.1007/s00227-010-1453-1
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DOI: https://doi.org/10.1007/s00227-010-1453-1