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Pond-dwelling powerhouse's genome points to its biofuel potential
Date:2/19/2014

sink to the bottom of ponds and revive in warmer weather. Moreover, despite the reduced number of total genes, S. polyrhiza has more copies of genes for enzymes involved in nitrogen absorption and metabolism than in other plants. This is probably linked to the plant's ability to utilize excess nitrogen in contaminated waters.

A thorough understanding of the genome and cellular mechanisms of S. polyrhiza could greatly enhance current efforts to recruit duckweed as a biofuel source. Messing estimates that duckweed will be a viable biofuel source within the next five years and points to Ceres Energy Group in New Jersey, which is already producing electricity from duckweed. Understanding which genes produce which traits will allow researchers to create new varieties of duckweed with enhanced biofuel traits, such as increased reduction of cellulose or increased starch or even higher lipid production. Starch can be directly used as a biofuel source and it can be converted to ethanol, the way corn is currently converted to ethanol fuel, but oils would have greater energy than ethanol.

"Classical breeding or genetics does not apply here because of its clonal propagation and rare flowering, but these organisms can be transformed with DNA," Messing said. "Therefore, new variants can be created with modified pathways for industrial applications. These variants would be an enhancement over what can be done now."

This genome was sequenced as part of a DOE Office of Science JGI Community Science Program (CSP) project (formerly the Community Sequencing Program). It exemplifies the collaborative approach and innovative projects that the CSP enables among researchers. Messing pointed to the study's advances over previous research.

"The sequencing of this genome opens new frontiers in the molecular biology of aquatic plants," said Messing. "This publication represents the single largest advance in this field and a new milestone i
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Contact: David Gilbert
degilbert@lbl.gov
925-296-5643
DOE/Joint Genome Institute
Source:Eurekalert  

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