Web accessible databases were developed at CIRAD in order to analyse and store molecular and phenotypic data of the numerous yet poorly documented tropical crops. TropGENE-DB (http://tropgenedb.cirad.fr) is a crop information system created to store information on genetic resources (agro-morphological data, parentages, allelic diversity), molecular markers, genetics maps, result of QTL (Quantitative Trait Loci) analyses, data from physical mapping, sequences, genes, as well as corresponding references. TropGENE-DB is organized on a crop-basis with currently four running modules (banana, cocoa, cotton and sugarcane), with plans to create additional modules for rice, oil palm, coconut, rubber tree, pineapple, taro, yam and sorghum. To organize data resulting from the phenotypic characterization of a library of T-DNA insertion lines of rice (Oryza sativa L cv. Nipponbare), we developed the Oryza Tag Line database (http://genoplante-info.infobiogen.fr/OryzaTagLine/), a project supported by the French genomic initiative Génoplante. Generic features such as production records, seed stocks, information on GUS or GFP assays in specific organs or tissues, and morphophysiological alterations observed during field evaluation of the insertion lines are displayed. OryGenesDB (http://orygenesdb.cirad.fr) goal is to help rice molecular geneticists to search for insertion lines in their favourite genes and link this information with related molecular data from several resources (cDNA, Gene, EST...) across a friendly user interface. (Texte intégral)