Abstract
The SQUAMOSA promoter binding protein (SBP)-box gene family is a plant-specific transcription factor family. This family plays a crucial role in plant growth and development. In this study, 20 SBP-box genes were identified in the tea plant genome and classified into six groups. The genes in each group shared similar exon-intron structures and motif positions. Expression pattern analyses in five different tissues demonstrated that expression in the buds and leaves was higher than that in other tissues. The cis-elements and expression patterns of the CsSBP genes suggested that the CsSBP genes play active roles in abiotic stress responses; these responses may depend on the abscisic acid (ABA), gibberellic acid (GA), and methyl jasmonate (MeJA) signaling pathways. Our work provides a comprehensive understanding of the CsSBP family and will aid in genetically improving tea plants.
Highlights
Tea is the oldest natural, nonalcoholic, caffeine-containing beverage and benefits human health due to its wealth of secondary metabolites, including catechins, theanine, polysaccharides, caffeine, and volatiles [1]
The AtSPL3 gene was the first SQUAMOSA promoter binding protein (SBP) gene identified in Arabidopsis, where it plays a pivotal role in promoting flowering under long-day conditions
We investigated the expression profiles of CsSBP genes in response to several abiotic stresses and plant hormones to determine their potential functions in stress tolerance
Summary
Tea is the oldest natural, nonalcoholic, caffeine-containing beverage and benefits human health due to its wealth of secondary metabolites, including catechins, theanine, polysaccharides, caffeine, and volatiles [1]. Tea plants are continuously challenged by a wide variety of abiotic stresses, such as low temperature, drought, and salinity [3,4]. Transcription factors (TFs) play critical roles in the regulation of physiological processes and adaptation to environmental stresses through various signal transduction pathways [6]. SQUAMOSA promoter binding protein (SBP)-box genes encode a plant-specific family of TFs that have a highly conserved SBP domain of approximately 76 amino acid residues. This conserved domain comprises three functionally important motifs, including two zinc-finger structures and a bipartite nuclear localization signal (NLS) that partially overlaps with the second zinc-finger [7]. AtSPL3 recognizes a conserved element in the promoter region of APETALA1 (AP1), an ortholog of SQUAMOSA [9]
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