BACKGROUND: Considering the growing demand for plant trait data and taking into account the lack of trait data from Eastern Europe, especially from its steppic region, we launched a new Ukrainian Plant Trait Database (UkrTrait v. 1.0) aiming at collecting all the available plant trait data from Ukraine.To facilitate further use of this database, we linked the trait terminology to the TRY Plant Trait Database, Thesaurus of Plant Characteristics (TOP) and Plant Trait Ontology (TO). For taxa names, we provide the crosswalks between the Ukrainian checklist and international sources, i.e. GBIF Backbone Taxonomy, World Checklist of Vascular Plants (World Checklist of Vascular Plants (World Checklist of Vascular Plants (WCVP), World Flora Online (WFO) and Euro+Med PlantBase. We aim to integrate our data into the relevant global (TRY Plant Trait Database) and pan-European (FloraVeg.EU) databases. The current version of the database is freely available at the Zenodo repository and will be updated in the future. NEW INFORMATION: Until now, plant traits for the Ukrainian flora were scattered across literature, often focusing on single species and written mainly in Ukrainian. Additionally, many traits were in grey literature or remained non-digitised, which rendered them inaccessible to the global scientific community. Addressing this gap, our Ukrainian Plant Trait Database (UkrTrait v. 1.0) represents a significant step forward. We compiled and digitised plant traits from local Ukrainian literature sources. Furthermore, we performed our own field and laboratory measurements of various plant traits that were not previously available in literature. In the current version of the UkrTrait, we focus on vascular plant species that are absent from the other European trait databases, with emphasis on species that are representative for the steppe vegetation. Traits assembled from literature include life span (annuals, biennials, perennials), plant height, flowering period (flowering months), life form (by Raunkiaer), plant growth form and others. Our own measured traits include seed mass, seed shape, leaf area, leaf nitrogen concentration and leaf phosphorus concentration. The current version, i.e. UkrTrait v. 1.0, comprises digitised literature data of 287,948 records of 75 traits for 6,198 taxa and our own trait measurements of 2,390 records of 12 traits for 388 taxa.

Department of Botany and Zoology Faculty of Science Masaryk University Brno Czech Republic Department of Botany and Zoology Faculty of Science Masaryk University Brno Czech Republic

Department of Botany Kherson State University Kherson Ukraine Department of Botany Kherson State University Kherson Ukraine

Department of Geobotany and Ecology M G Kholodny Institute of Botany National Academy of Sciences of Ukraine Kyiv Ukraine Department of Geobotany and Ecology M G Kholodny Institute of Botany National Academy of Sciences of Ukraine Kyiv Ukraine

Department of Plant Biology and Ecology University of the Basque Country Leioa Spain

Department of Population Ecology Institute of Botany of the Czech Academy of Sciences Průhonice Czech Republic Department of Population Ecology Institute of Botany of the Czech Academy of Sciences Průhonice Czech Republic

Department of Taxonomy Institute of Botany of the Czech Academy of Sciences Průhonice Czech Republic Department of Taxonomy Institute of Botany of the Czech Academy of Sciences Průhonice Czech Republic

Falz Fein Biosphere Reserve Askania Nova NAAS of Ukraine Askania Nova Ukraine Falz Fein Biosphere Reserve Askania Nova NAAS of Ukraine Askania Nova Ukraine

Institute of Environmental Biology Faculty of Biology University of Warsaw Warsaw Poland Institute of Environmental Biology Faculty of Biology University of Warsaw Warsaw Poland

M M Gryshko National Botanical Garden National Akademy of Sciences of Ukraine Kyiv Ukraine M M Gryshko National Botanical Garden National Akademy of Sciences of Ukraine Kyiv Ukraine

Theoretical Ecology Institute of Biology Freie Universität Berlin Berlin Germany Theoretical Ecology Institute of Biology Freie Universität Berlin Berlin Germany

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