The LATERAL ORGAN BOUNDARIES DOMAIN/ASYMMETRIC LEAVES2-LIKE (LBD/ASL) gene family encode a class of transcription factors harbouring a conserved plant-specific LOB domain and play roles in lateral organ development. A variety of studies have revealed the developmental functions of certain LBD genes in leaf polarity establishment, tracheary element development, the auxin-dependent apical-basal polarity and patterning processes in the embryo, asymmetric cell division during male gametophyte development, and lateral root formation in Arabidopsis as well as the developmental functions of their homologues in Oryza sativa and Zea mays. In this seminar, I will talk some of our research progress on gene regulatory networks of the LBD genes during Arabidopsis lateral root development and also discuss some data indicating the role of the LBD genes as default repressors in seed germination and cotyledon expansion during ABA response.
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