Abstract
Lateral organ boundaries (LOB) domain (LBD) genes, a gene family encoding plant-specific transcription factors, play important roles in plant growth and development. At present, though there have been a number of genome-wide analyses on LBD gene families and functional studies on individual LBD proteins, the diverse functions of LBD family members still confuse researchers and an effective strategy is required to summarize their functional diversity. To further integrate and improve our understanding of the phylogenetic classification, functional characteristics and regulatory mechanisms of LBD proteins, we review and discuss the functional characteristics of LBD proteins according to their classifications under a phylogenetic framework. It is proved that this strategy is effective in the anatomy of diverse functions of LBD family members. Additionally, by phylogenetic analysis, one monocot-specific and one eudicot-specific subclade of LBD proteins were found and their biological significance in monocot and eudicot development were also discussed separately. The review will help us better understand the functional diversity of LBD proteins and facilitate further studies on this plant-specific transcription factor family.
Highlights
Proteins containing conserved Lateral Organ Boundaries (LOB) domain(s) are defined as LOB-domain (LBD) proteins
Though the functional significance of LBD proteins has been well summarized in several reviews according to the biological roles in plant development and defense response processes, such diverse functions are still confusing and make it difficult to grasp the regulatory role of this plant-specific gene family encoding transcription factors
Through searching the online databases of MaizeGDB and BAR, we found that Zm00001d013625, Zm00001d033466 and BGIOSGA013249 are all highly expressed in shoot apical meristem (SAM)
Summary
Proteins containing conserved Lateral Organ Boundaries (LOB) domain(s) are defined as LOB-domain (LBD) proteins They are plant-specific transcription factors, existing in plant genomes from green algae to angiosperms. Though the functional significance of LBD proteins has been well summarized in several reviews according to the biological roles in plant development and defense response processes (e.g., root development, leaf development, and plant defense), such diverse functions are still confusing and make it difficult to grasp the regulatory role of this plant-specific gene family encoding transcription factors. By combining the results in functional studies and evolutionary researches of LBD family members, we found that LBD genes have similar molecular functions tending to be in the same phylogenetic clade.
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