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Seed coat and enzymes protect seed: lotus

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Lotus fruit with seeds / H. Zell / LicenseGFDL - Gnu Free Document License

Seeds of lotus remain viable for thousands of years via hard seed coat and repair enzymes.

BIOMIMICRY TAXONOMY
Summary
"In the West, lotus (Nelumbo nucifera Gaertn.) is relatively little known. However, for more than 3000 years, lotus plants have been cultivated as a crop in Far-East Asia, where they are used for food, medicine and play a significant role in religious and cultural activities. Holder of the world's record for long-term seed viability (1300 years) is a lotus fruit (China Antique) from Xipaozi, Liaoning Province, China. Five offspring of this variety, from 200-500-year-old fruits (14C dates) collected at Xipaozi, have recently been germinated, and are the first such seedlings to be raised from directly dated fruits. The fruits at Xipaozi, preserved in a dry ancient lakebed, have been exposed to low-dose γ-radiation for hundreds of years (having an accumulated soil irradiation of 0.1-1.0 Gy). Offspring from these old fruits show abnormalities that resemble those in various modern seedlings irradiated at much higher doses. Although these lotus offspring are phenotypically abnormal, the viability of old seeds was evidently not affected by accumulated doses of up to 3 Gy. Growth characteristics of first- and second-year lotus offspring of these fruits, products of the longest-term radiobiological experiment on record, are summarized here (rapid early growth, phenotypic abnormalities, lack of vigour, poor rhizome development and low photosynthetic activity during second-year growth). Aspects of their chromosomal organization, phenotype and physiology (rapid recovery from stress, heat-stable proteins, protein-repair enzyme) are discussed. Important unsolved problems are suggested to elicit interest among members of the seed science community to the study of old fruits recently collected at Xipaozi, with particular emphasis on aspects of ageing and repair." (Shen-Miller 2002:131)

"'The secret of the sacred lotus may be its seed coat,' says Shen-Miller. 'The coat is very hard, built to prevent water and air from entering and degrading the seed.' The sacred lotus is also blessed with a hardy collection of repair enzymes, such as L-isoaspartyl methyltransferase and other proteins that minimize seed damage, resist attacks by fungi, and help the seed survive harsh temperatures. 'The lotus is a scientific treasure,' remarks Shen-Miller, adding that the flower could reveal biochemical traits that boost quality of life by repairing the molecular damage of aging." (Brown 2001:1884-1885)
About the inspiring organism
Med_800pxnelumbo_nucifera_005 Sacred lotus
Nelumbo nucifera Gaertn.

Habitat(s): Wetlands
Learn more at EOL.org
Some organism data provided by: ITIS: The Integrated Taxonomic Information System
Organism/taxonomy data provided by:
Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist

IUCN Red List Status: Unknown

Bioinspired products and application ideas

Application Ideas: Understanding repair mechanisms for this fruit may help understand aging process for other organisms and of human-made structures. Preservative alternative. Waterproofing. Sealing. Antifungal compounds. Packaging that provides an alternative to canning (and bisphenol-A) for long-term food storage, alternative to glass bottles, packaging for domestic seeds that will extend their viability, building applications for clean rooms, containers for safe storage of chemicals.

Industrial Sector(s) interested in this strategy: Construction, manufacturing, food industry, packaging, agriculture, building, chemicals

Experts
Department of Ecology and Evolutionary Biology
Jane Shen-Miller
University of California Los Angeles
Department of Chemistry and Biochemistry
Steve Clarke
University of California Los Angeles
References
Shen-Miller, J. 2007. Sacred lotus, the long-living fruits of China Antique. Seed Science Research. 12(03): 131-143.
Learn More at Google Scholar Google Scholar  

Brown K. 2001. Patience Yields Secrets of Seed Longevity. Science. 291(5510): 1884-1885.
Learn More at Google Scholar Google Scholar  

Comments

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Sherry
over 4 years ago
Thanks to Duarte Miguel Prazeres for finding and uploading this photo.
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