Characterization of the LBD gene family in Brachypodium: a phylogenetic and transcriptional study.
An unambiguous nomenclature is proposed for the twenty-eight-member LOB domain transcription factor family in Brachypodium . Expression analysis provides unique transcript patterns that are characteristic of a wide range of organs and plant parts. LOB (lateral organ boundaries)-domain proteins define a family of plant-specific transcription factors involved in developmental processes from embryogenesis to seed production. They play a crucial role in shaping the plant architecture through coordinating cell fate at meristem to organ boundaries. Despite their high potential importance, our knowledge of them is limited, especially in the case of monocots. In this study, we characterized LOB domain protein coding genes (LBDs) of Brachypodium distachyon, a model plant for grasses, and present their phylogenetic relationships and an overall spatial expression study. In the Brachypodium genome database, 28 LBDs were found and then classified based on the presence of highly conserved LOB domain motif. Their transcript amounts were measured via quantitative real-time RT-PCR in 37 different plant parts from root tip to generative organs. Comprehensive phylogenetic analysis suggests that there are neither Brachypodium- nor monocot-specific lineages among LBDs, but there are differences in terms of complexity of subclasses between monocots and dicots. Although LBDs in Brachypodium have wide variation of tissue-specific expression and relative transcript levels, overall expression patterns show similarity to their counterparts in other species. The varying transcript profiles we observed support the hypothesis that Brachypodium LBDs have diverse but conserved functions in plant organogenesis.
Institute of Plant Biology, Biological Research Centre, Temesvári krt. 62, Szeged, 6726, Hungary.
Magdolna
M
Gombos
Institute of Plant Biology, Biological Research Centre, Temesvári krt. 62, Szeged, 6726, Hungary.
Zoltán
Z
Zombori
Institute of Plant Biology, Biological Research Centre, Temesvári krt. 62, Szeged, 6726, Hungary.
Mária
M
Szécsényi
Institute of Plant Biology, Biological Research Centre, Temesvári krt. 62, Szeged, 6726, Hungary.
Györgyi
G
Sándor
Institute of Plant Biology, Biological Research Centre, Temesvári krt. 62, Szeged, 6726, Hungary.
Hajnalka
H
Kovács
Institute of Plant Biology, Biological Research Centre, Temesvári krt. 62, Szeged, 6726, Hungary. gyorgyey.janos@brc.mta.hu.
János
http://orcid.org/0000-0001-6806-8501
J
Györgyey
D000595:Amino Acid Sequence; D058431:Brachypodium / Q000235:genetics*; D032461:Chromosomes, Plant / Q000235:genetics; D016000:Cluster Analysis; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D005810:Multigene Family; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D014158:Transcription, Genetic
D010940:Plant Proteins; D012333:RNA, Messenger
Brachypodium distachyon; Expression profile; LOB domain gene family (LBD); Nomenclature; Quantitative real-time RT-PCR; Tissue specificity
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