Lemnaceae Genomics

Lemna.org is a repository of duckweed genome information for researchers. Currently we host the draft genome sequence of a single species, Lemna gibba, and hope to work with the community to add more genomes as the data are made available.

Funding was provided by the U.S. Department of Energy.


This site runs atop an open source software stack including Drupal for content management, Tripal to integrate Drupal with our Chado/PostgreSQL database, and analysis tools including NCBI Blast+ and GBrowse.

Data Release Policy

As a public service, preliminary assemblies of Lemna genome sequence data are being made available to the community by Cold Spring Harbor Laboratory (CSHL) before their publication in the scientific literature. The purpose of this policy is to balance the imperative that the data from the Lemna genomes be made available to the scientific community as soon as possible with the reasonable expectation that the group responsible for the sequencing will publish the primary report without concerns about preemption by other groups that did not participate in the effort.

These pre-publication data are preliminary and may contain errors. The goal of our policy is that early release should enable the progress of science. By accessing these data, you agree not to publish any articles containing analyses of genes or genomic data prior to peer-reviewed journal publication by the Lemna genome project team at CSHL and its collaborators of a comprehensive genome analysis. These restrictions apply to all Lemna genome data on this site and will be lifted on the journal publication of the whole genome description of assemblies and draft annotations.

Any analyses involving these data are included in this data usage policy, including annotation of genes, identification of sets of genomic features such as genes, gene families, regulatory elements, repeat structures, GC content, etc., and whole-genome comparisons of regions of among-species conservation. Also included are uses of the genome data as a reference for transcriptomic analyses (RNA seq, bisulfite seq, chip seq or similar). Interested parties are encouraged to contact the the principal investigator if they wish to discuss the possibility of collaborative publication of such analyses.

The data may be freely downloaded and used by all who respect the restrictions in the previous paragraphs. While still in waiting period, the assembly and raw sequence reads should not be redistributed or repackaged without permission from the principle investigator. When such permission has been obtained, any redistribution of the data during this period should carry this notice: "The Martiensslen laboratory at Cold Spring Harbor Laboratory provides these data in good faith, but makes no warranty, expressed or implied, nor assumes any legal liability or responsibility for any purpose for which the data are used." and users should be directed to this release policy page.

Once moved to unreserved status, the data are freely available for any subsequent use.