The LAVA mutants defective in auxin-regulated primary or lateral root development.

Regulation of PIN activity, polarity as well as auxin gradient generation and its canalisation remain crucial topics in plant developmental biology especially in the context of organogenesis like the formation new lateral roots. Here, we are presenting the LAVA (LR Alterations Visualised after Auxin) collection of 278 mutants, defective in auxin-induced lateral root (LR) morphogenesis. Those mutants were obtained from a forward genetic screen in which synthetic auxin 1-Naphtyl Acetic Acid (1-NAA) was used to induce LR formation in the mutagenized PIN3::PIN3-GFP population. Our database contains mutant root phenotyping and for a subset of the collection, we recorded PIN polarity and subcellular trafficking, cotyledon vasculature development, primary and LR gravitropism as well as aerial phenotypes with some reminiscent to auxin-regulated organogenesis aberrations. We are convinced that our dataset can serve as a unique tool to identify novel components of auxin signalling, transport, and cell polarity but also be of interest to the broader plant research community interested in the roots system architecture that is vital for plant survival, growth and adaptation to environmental conditions.

The phenotype analysis of the mutant collection is summarized and organised in an Excel spreadsheet (2024-08-07_mutant_database_Table S1). The photographic material is organised in folder form (see Supporting Data S1 in this repository), where each folder number corresponds to a particular mutant and entry in the excel table.

 Mutant seeds will be available in the European Arabidopsis Stock Centre (NASC). The seed sending to the repository is in progress.

The manuscript describing this work is currently being submitted to the research journal. Its version will be available on the open access Masaryk University repository.