Abstract
Mannitol, one of the most widely occurring sugar alcohol compounds, is found in bacteria, fungi, algae, and plants. In these organisms the compound acts as a compatible solute and has multiple functions, including osmoregulation, storage, and regeneration of reducing power, and scavenging of active oxygen species. Because of the diverse functions of mannitol, introducing the ability to accumulate it has been a hallmark of attempts to generate highly salt-tolerant transgenic plants. However, transgenic plants have not yet improved significantly in their salt tolerance. Recently, we purified and characterized 2 enzymes that biosynthesize mannitol, mannitol-1-phosphate dehydrogenase (M1PDH) and mannitol-1-phosphate-specific phosphatase, from the marine red alga Caloglossa continua, which grows in estuarine areas where tide levels fluctuate frequently. The activation of Caloglossa M1PDH is unique in that it is regulated by salt concentration at enzyme level. In this review we focus on the metabolism of mannitol, mainly in marine photosynthetic organisms, and suggest how this might be applied to producing salt-tolerant transgenic plants.
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Acknowledgments
We thanks Dr. John Beardall for his kind and critical reading of this manuscript. The study on algal mannitol metabolism was supported in part by the Salt Science Foundation (Tokyo, Japan) in 2000 (funding no. 0020) and 2001 (funding no. 0124).
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Iwamoto, K., Shiraiwa, Y. Salt-Regulated Mannitol Metabolism in Algae . Mar Biotechnol 7, 407–415 (2005). https://doi.org/10.1007/s10126-005-0029-4
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DOI: https://doi.org/10.1007/s10126-005-0029-4