Phylogeny and Functions of LOB Domain Proteins in Plants

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.

Transcriptome-Wide Analyses Provide Insights into Development of the Hedychium coronarium Flower, Revealing Potential Roles of PTL

“…Comparing our unigenes with previous studies where lineage-speci c genes had been retrieved only in certain lineages within the Zingiberales, some of the most interesting genes were homologs to LOBdomain genes, a plant-speci c transcription factor family which has been implicated in de ning organ boundaries between Arabidopsis ower organs through the negative regulation of brassinosteroid accumulation [23,42], as well as root development, auxin signaling and stress response [43]. The shared oral transcription factors recovered for all species across the exemplar Zingiberales species analyzed, such as LOB40, 41 and 6-like homologs [30], were also identi ed in the H. coronarium oral transcriptome, suggesting that these genes could be conserved regulators of oral development across the Zingiberales.…”

CsLOB1 regulates susceptibility to citrus canker through promoting cell proliferation in citrus

“…CsLOB1 belongs to the lateral organ boundaries domain ( LBD ) family encoding a member of the plant‐specific LOB domain transcription factors (Xu et al ., 2016; Zhang et al ., 2017). LBD family members are classified into two subfamilies based on the presence (class I) or absence (class II) of functional leucine‐zipper‐like domains, though the majority of LBD members, including CsLOB1 and its orthologs AtLBD1 and AtLBD11 in Arabidopsis, belong to class I (Shuai et al ., 2002; Zhang et al ., 2017, 2020). LBD proteins are key regulators of plant organ development, and widely participate in molecular mechanisms that control plant growth and development (Majer and Hochholdinger, 2011; Xu et al ., 2016).…”

Endophytic Bacillus altitudinis Strain Uses Different Novelty Molecular Pathways to Enhance Plant Growth

“…Conversely, LOB domain-containing protein genes constitute a gene family that encodes plant-specific TFs that play key functions during plant growth (Zhang et al, 2020). These proteins are essential TFs that regulate plant organ development, photomorphogenesis (Mangeon et al, 2011), petiole development (Ge et al, 2014), hormone response (Zentella et al, 2007), and metabolism regulation (Rubin et al, 2009).…”