Abstract
The plant specific lateral organ boundaries domain (LBD) family of transcription factors (TFs) is involved in many aspects of plant growth and development. In this study, MdLBD13, a nitrate-induced LBD family gene from the apple (Malus × domestica), was isolated and characterized. Overexpression of MdLBD13 repressed anthocyanin biosynthesis by reducing expression of the structural genes associated with the flavonoid pathway. Overexpression ofMdLBD13 also repressed expression of the N–responsive genes that are required for nitrate uptake, transport and assimilation, resulting in reduced nitrate content and nitrate reductase activity in apple calli, as well as in Arabidopsis. Ectopic expression of MdLBD13 also promoted lateral root development in transgenic Arabidopsis. These results demonstrate that MdLBD13acts as a negative regulator in anthocyanin biosynthesis and nitrate utilization.
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