| Sumario: | Flavonoids and isoflavonoids are quite important compounds involved in different processes in plants. Isoflavonoids are mostly produced by legumes, but there is limited information on the regulatory mechanisms controlling their biosynthesis. Understanding the role of potential regulatory genes of the isoflavonoid biosynthetic pathway constitutes an important topic of research. In this Doctoral Thesis it has been studied the possible role of several MYB transcription factors (TFs) and their relationship with the synthesis of (iso)flavonoids, abiotic stress and growth conditions (symbiotic or non-symbiotic) in the model legume Lotus japonicus. For this purpose, different lines of mutants with insertions of the LORE1 endogenous transposon have been analyzed. Levels of detectable flavonoids and isoflavonoids, together with other types of transcriptomic data, were correlated with changes in growth, nodulation, abiotic stress responses, and, in some cases, flowering or seed production in the mutants, by comparison to wild type plants. The role in the regulation of these different processes by the different TFs examined is described.
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