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BRANCHED1: A Key Hub of Shoot Branching

Ming Wang, Marie-Anne Le Moigne, Jessica Bertheloot and 7 more

Frontiers in Plant Science · 2019 · Review · CC BY

doi:10.3389/fpls.2019.00076

Abstract

Shoot branching is a key process for plant growth and fitness. Newly produced axes result from axillary bud outgrowth, which is at least partly mediated through the regulation of BRANCHED1 gene expression (BRC1/TB1/FC1). BRC1 encodes a pivotal bud-outgrowth-inhibiting transcription factor belonging to the TCP family. As the regulation of BRC1 expression is a hub for many shoot-branching-related mechanisms, it is influenced by endogenous (phytohormones and nutrients) and exogenous (light) inputs, which involve so-far only partly identified molecular networks. This review highlights the central role of BRC1 in shoot branching and its responsiveness to different stimuli, and emphasizes the different knowledge gaps that should be addressed in the near future.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 24, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

Plants are sessile organisms that need to adjust their shape to suit the diversity of the changing environmental conditions in which they are growing. The regulation of shoot branching is a relevant strategy for plant survival and space occupancy, and involves an intricate regulatory network. Shoot branching depends on the status of bud dormancy, which is a temporary and reversible state. Shoot branching patterns, considered here as the distribution of branches along a parent stem, are generated during plant postembryonic development. They depend on the ability of axillary vegetative buds located at the axil of each leaf to remain inactive or to produce a new branch in response to variable stimuli.

Shoot branching is an important feature of plant architecture that determines the interface between the plant and the surrounding environment. Shoot branching contributes to essential processes such as the establishment of leaf area and distribution that determine light interception and photosynthesis, which in turn influence the number of flowers and fruits, fruit filling and yield. Branching also influences the plant competitiveness against weeds or the propagation of pests. In ornamental plants, branching also determines plant visual quality, which drives consumers’ preferences.

Extensive studies have been undertaken for several decades to find out the mechanisms involved in branching. The currently accepted idea supports that endogenous, developmental, and environmental inputs converge into bud-located integrators, which are at the head of a network of mechanisms governing the ability of buds to grow out. Among these inputs, hormones, sugar, nitrogen, light, and water play a determining role in shoot branching regulation. Those factors may influence shoot branching via various physiological and molecular mechanisms, targeting different branching-related genes and acting synergistically or antagonistically. BRC1 (BRANCHED 1) is well known to act locally in buds and is considered to be an important hub of different signals controlling the ability of a bud to grow out in many species. Arabidopsis thaliana harbors two BRANCHED genes, namely BRANCHED 1 (BRC1) and BRANCHED 2 (BRC2); they encode TCP transcription factors closely related to TEOSINTE BRANCHED1 (TB1) in maize and FINE CULM 1 (FC1) in rice. In addition, they are conserved in many species of the plant kingdom (Table 1). The corresponding mutants show an altered branching phenotype as compared to the wild type. This review addresses the molecular identity of BRC1, its involvement in shoot branching, and its regulation in response to endogenous inputs (hormones and nutrients) and exogenous cues (light). We also discuss how BRC1 can mechanistically govern bud outgrowth, and raise a few questions about future investigations.

BRC1 Belongs to the TCP Transcription Factor Family

AtBRC1 (also called AtTCP18) contains an open reading frame (ORF) made of ca.1,290-bp that encodes a protein with a TCP domain and an R domain. It belongs to the TCP gene family, an evolutionarily conserved family that first appeared in freshwater algae of the Charophyta family. The TCP gene family was first described by and is represented by four ‘founding members’: TEOSINTE BRANCHED1 (TB1), CYCLOIDEA (CYC), PROLIFERATING CELL NUCLEAR ANTIGEN FACTOR1 (PCF1), and PCF2, all identified on the basis of their functions in plant development or their DNA-binding capacities (for a review see; ). In Arabidopsis, the TCP family comprises 24 genes encoding predicted proteins with a TCP domain and categorized into two classes: class I (also known as PCF or TCP-P) is made up of 13 predicted proteins related to the PCF rice factors, and class II (also known as TCP-C) is made up of 11 predicted proteins related to the Antirrhinum CYC and CIN genes and to the Zea mays TB1 gene. All these transcription factors have the so-called TCP domain, a 59-amino-acid basic helix–loop–helix (bHLH), in common. Such a motif allows for DNA binding and protein–protein interactions in cells. The TCP domain is also necessary for nuclear localization, and some TCP proteins can be targeted to the nucleus in heterologous systems.

Besides the TCP domain, a few class-II TCPs, including BRC1, display a functionally unknown arginine-rich motif, the R-domain, which is predicted to mediate protein interactions. The R domain may involve the phosphorylation process of BRC1 by a cAMP-dependent protein kinase. Additionally, most members of the CYC/TB1 subclass, to which BRC1 belongs, contain a conserved ECE (glutamic acid-cysteine-glutamic acid) motif that remains functionally uncharacterized and is located between their TCP and R domains.

The TCP proteins of various species regulate many biological processes, including seed germination, plant branching, lateral organ development, floral asymmetry, gametophyte development, leaf senescence, circadian rhythms, and defense responses (for a review see; ). These TCP-dependent regulations could occur directly through their binding to the promoter of target genes or indirectly via their interactions with plant hormones. In Arabidopsis, the CYC/TB1 clade consists of AtBRC1, AtBRC2 (also called AtTCP12) and AtTCP1, and is mainly involved in the development of axillary meristems, giving rise to either flowers or lateral shoots.

BRC1 Is a Central Actor of Shoot Branching

The shoot axillary meristem produces a branch when the appropriate endogenous and exogenous inputs occur, so as to adapt plant architecture to environmental conditions. In monocots, TB1 from Z. mays and homologs of TB1 in Oryza sativa (OsTB1/FC1, ) and Sorghum bicolor (SbTB1, ) promote bud arrest locally, without affecting the number of buds, and thus lead to reduced tillering. Consistently, TB1 and OsTB1 are mainly expressed in axillary bud meristems, and their mutants tb1 and fc1 exhibit over-tillering phenotypes. The barley TB1 ortholog, INT-C, has been shown to act mainly in the control of spike architecture, with a minor role in tillering. Moreover, modern maize displays less branching than the wild teosinte ancestor due to increased TB1 expression. However, the int-c loss-of-function mutant showed less tillers in barley, whose phenotype is opposite to the recessive tb1 mutant in maize.

In dicots, genes closely related to TB1 have been studied in a variety of species. In Arabidopsis, AtBRC1 and AtBRC2 both negatively regulate the branching process. However, AtBRC1 seems to play a more pivotal role in axillary bud development than AtBRC2. The AtBRC1 gene is predominantly expressed during the development of axillary buds (axillary meristems, bud leaf primordia and subtending vascular tissue). AtBRC1 expression is inversely correlated with bud outgrowth and brc1 mutant phenotypes are non-pleiotropic, while constitutive overexpression of AtBRC1 reduces the growth of the whole plant. Moreover, many AtBRC1-homologous genes have also been found to be involved in shoot branching suppression (Table 1). In addition, repressed buds in pea have been found to be as metabolically active as growing buds, so BRC1 growth repression may not involve metabolism. Recent data demonstrate that AtBRC1 is not always necessary for the complete inhibition of all buds in Arabidopsis.

Genomic sequences of Solanum species, including potato and tomato, also contain the BRC1-like gene, where it occurs under two forms. More interestingly, in Solanum tuberosum, the BRANCHED1a (StBRC1a) gene encompasses an alternative splice site leading to the generation of two BRC1a protein isoforms, BRC1aLong and BRC1aShort, with distinct C-terminal regions. The BRC1aLong C-terminal region has a strong activation domain and moves to the nucleus, whereas the BRC1aShort C-terminal region lacks an activation domain, which prevents the nuclear targeting of the protein. These different splice variants of AtBRC1 have also been found in Arabidopsis (data not shown), but whether the mechanism mentioned above exists in Arabidopsis is still unknown. A central role of BRC1 in shoot branching has also been revealed in pea (PsBRC1, ), Chrysanthemum (DgBRC1, ), and poplar (PcBRC1, and 2018). In Rosa sp., carried out a Quantitative Trait Loci (QTL) analysis of the plant architecture, using a segregating, recurrent blooming population called ‘The Fairy’ × ‘Old Blush’. They showed that the branching angle of order 2 long axes, the number of short axes (the type of axis that comprises one to four internodes), and stem elongation were correlated, with QTL located in the genomic region of RhBRC1, and assumed a pleiotropic role of RhBRC1 in the establishment of the bushy shape of Rosa sp. Further work will be required to more accurately define the role of BRC1 in the establishment of the plant complex architecture.

BRC1 Is an Integrator of Diverse Hormonal Signaling Networks

Auxin, cytokinins (CK), and strigolactones (SL) are implicated in the hormonal regulation of BRC1 expression. In this regulation network, auxin and SL act as inducers while CK act as repressors. According to, this kind of regulation could be involved in various metabolism pathways such as feedback regulation, long-distance hormone transport, and the interplay of plant hormone metabolism and signaling.

In apical dominance, the polar auxin transport (PAT) stream in the main stem, which is mediated by the PIN (PIN-FORMED) auxin-efflux facilitators located in xylem-associated cells, inhibits axillary bud outgrowth. Auxin cannot directly regulate BRC1 expression because it is not transported from the stem to the buds in great enough amounts. It is hypothesized that PAT prevents the establishment of auxin canalization from axillary buds to the stem, and that this might be necessary for the buds to grow out. The characterization of the auxin-resistant Arabidopsis mutant axr1 indicated that such an auxin effect occurred after axillary meristem initiation through the inhibition of bud outgrowth.

Auxin can indirectly promote BRC1 expression in the bud. Furthermore, auxin-mediated BRC1 regulation through the control of two antagonistic factors, CK and SL, fine-tunes BRC1 expression inside buds. The role of CK, a collection of adenine-related compounds, in bud outgrowth was evidenced decades ago, when CK application to dormant buds was shown to promote bud outgrowth. In parallel, auxin indirectly inhibits bud outgrowth by decreasing systemic and local CK levels, which determines the CK supply to the buds. CK can act to promote branching partly by promoting PIN3,4,7 cross-stem auxin transport between the bud and the adjoining stem, thereby potentially acting partly independently of AtBRC1 repression directly in the bud. High CK levels in axillary buds lead to the activation of axillary buds through downregulation of BRC1 expression, although Psbrc1 (a pea BRC1 mutant) remained sensitive to CK application. These findings might indicate that the branch-promoting hormone CK partly controls shoot branching by negatively regulating BRC1 at the transcriptional level. In rice, transcript levels of OsTB1/FC1 also decreased in a CK-dose-dependent manner, and similar down-regulation of DgBRC1 was reported in Chrysanthemum. This CK-dependent BRC1 regulation can be part of the light intensity-dependent bud outgrowth regulation in Rosa sp.. The Arabidopsis altered meristem program1 (amp1) mutants are characterized by higher levels of CK, more bud outgrowth, more axillary meristems, and reduced BRC1 expression. Although CK are a powerful repressor of BRC1/TB1/FC1 expression, the molecular mechanisms driven by this CK-dependent regulation still remain an open question (Figure 1).

Strigolactones (SL), a group of carotenoids derived from terpenoid lactones, act as endogenous shoot branching inhibitors. Direct application of GR24 – an SL analog – on buds inhibited outgrowth on intact and decapitated plants, and auxin application elevated the transcription levels of SL biosynthesis genes. These findings support that auxin-mediated bud outgrowth inhibition involves the promotion of systemic and local SL synthesis in the stem and thereby of SL levels inside buds. Consistently, different SL mutants exhibited a highly branched phenotype in pea [ramosus (rms)], petunia [decreased apical dominance (dad)], and Arabidopsis [more axillary growth (max)]. A role for BRC1 downstream of SL was first reported in Arabidopsis and pea, where BRC1 expression was upregulated by SL, and shoot branching in the brc1 mutant was insensitive to SL. However, SL application did not change the transcriptional activation of OsTB1/FC1 expression in rice. Recent investigations showed that DWARF 53 (D53)/SUPPRESSOR OF MAX2 1-LIKE genes (SMXL6, 7, 8) acted downstream of SL as repressors of SL-dependent BRC1 upregulation and thereby promoted shoot branching. Mutants deficient in D53-like genes indeed displayed constitutive BRC1 upregulation. Moreover, SL perception by D14 (α/β hydrolase) and the recruitment of the SCF complex resulted in the polyubiquitination and 26S-proteasome–mediated degradation of D53. D53 physically interacts with IPA1 (IDEAL PLANT ARCHITECTURE1), a repressor of shoot branching, and prevents it from upregulating TB1 expression (Figure 1). IPA1, also named OsSPL14, is a member of the SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) family of plant-specific transcription factors that directly binds to the TB1 promoter in rice and activates TB1transcriptional activity (Figure 1;; ). Further support for the relevance of the “IPA-1-related genes and TB1” module in shoot branching comes from a study in wheat, where TaD53 physically interacted with TaSPL3 and prevented TaSPL3 upregulation of TaTB1 gene expression. Although the Arabidopsis homologs of IPA1 have been identified as being SPL9/15, further work will be required to confirm whether this mechanism is involved in the SL-dependent regulation of AtBRC1.

Besides auxin, CK, and SL, gibberellin (GA) might also be involved in the regulation of BRC1 expression, even if the mechanism is still unknown. GAs (diterpenoid tetracyclin molecules) are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering, flower development, and leaf and fruit senescence. In Rosa sp., GA biosynthesis strongly increases during bud outgrowth. In the perennial woody plant Jatropha curcas, GA and CK synergistically promote lateral bud outgrowth, and both hormones negatively influence BRC1 and BRC2 expression. Simultaneously altered GA and SL levels positively influenced the expression of the GA2 OXIDASE2 gene which encodes a GA-catabolic enzyme, and the expression of BRC1 (Figure 1). Furthermore, GA is required for CK-mediated axillary bud outgrowth in A. thaliana.

BRC1 Expression Is Regulated by Light

Shoot branching is negatively affected by low light intensity and low ratios of red/far red (R:FR) light in many species. In this process, light acts both as a driver of photosynthesis for the supply of sugars to axillary buds and as a photomorphogenic signal. The signaling role of light in plant branching was first unraveled by. In 2006 and 2010, these authors showed that active PHYB suppressed the expression of the SbTB1 gene in sorghum, leading to high plant branching, whereas environmental conditions that inactivate phyB (low R/FR ratio) increased SbTB1 expression and in turn repressed bud outgrowth. Additional experiments carried out in Arabidopsis confirmed these findings: a low R/FR ratio favored AtBRC1 upregulation through the PHYB pathway, which is required for shoot branching reduction (Figure 1; ). This effect seems to be reversible, as evidenced by the rapid and local downregulation of AtBRC1 after increasing the R/FR ratio. Such a response may contribute to the rapid adaptation of plants to fluctuations in the R/FR light ratio.

Besides light quality, a slight decrease of the photosynthetic leaf area is associated with a stimulation of TB1 expression in sorghum seedlings and consequently a lower propensity of tiller buds to grow out. In addition, darkness-exposed Rosa sp. exhibited no bud outgrowth and higher levels of RhBRC1 transcripts than plants placed under light. All these findings indicate that BRC1 expression is very sensitive to both light intensity and quality. However, this regulation may involve distinct mechanisms.

BRC1 Is Regulated by Nutrients

Sugars are well known to promote bud outgrowth in many species, and the relationship between sugars and bud outgrowth has been investigated for years. Sugar effects are seemingly dependent on environmental conditions. Sugars not only serve as a carbon source for plant metabolism, but also as an important signaling entity that affects many developmental processes including BRC1 gene expression. In an interesting study, demonstrated that the initial signal responsible for the release of bud outgrowth after decapitation in pea was an increase in sugar availability rather than a decrease in apically supplied auxin, as traditionally thought. This is in line with the earlier proposal by Morris and collaborators, who assumed the existence of an auxin-independent “fast-decapitation signal” leading to bud outgrowth initiation after decapitation. Furthermore, also reported that the timing of the increase of the sugar flux inside buds and bud outgrowth tightly coincided with the downregulation of BRC1 expression. In this process, sugar acts more likely as a signaling entity, because many non-metabolizable sugar analogs can trigger bud outgrowth and repress BRC1 expression. In addition, this effect of sugar on BRC1 transcription could be mediated indirectly via sugar regulation of CK biosynthesis and SL signaling and/or directly (irrespective of hormonal action). Decapitation led to a rapid and sustained rise in trehalose-6 phosphate (T6P) levels in axillary buds and a decreased expression level of BRC1, which supports that T6P could partly mediate the sugar-dependent down-regulation of BRC1 (Figure 1). Further works are required to further unravel this molecular regulatory network. In the present state of knowledge, we cannot rule out that the transcriptional regulation of BRC1 in response to sugars could involve many sugar-signaling pathways and also that BRC1 expression is sensitive to the plant carbon status and/or energy levels.

Mineral nutrition influences tiller bud outgrowth in barley. In wheat, phosphorus deficiency directly altered the normal pattern of tiller emergence by reducing the rate of tiller emergence for each tiller. Although several links exist between phosphate and the branching-related hormones (auxin, SL and CK), no direct effect of the phosphate status on BRC1/TB1/FC1 gene expression is documented. Low-phosphate growth conditions enhance SL production in many species. This situation leads to the repression of shoot branching, but also to the stimulation of lateral root formation for soil foraging. In contrast to SL, low levels of inorganic phosphate reduce CK production, which correlates with a reduced number of branches.

In herbaceous and woody plants, high levels of nitrogen fertilization (nitrate and/or ammonium) result in (i) a large number of outgrowing buds, and (ii) improved secondary axis elongation. confirmed that nitrogen deficiency did not affect the initiation of tiller buds, but suppressed tiller bud outgrowth in O. sativa. In Arabidopsis, low nitrate delayed axillary bud activation, and this process involved an effect of the plant nitrogen status rather than a direct nitrate-signaling pathway. Recent results demonstrated a relationship between nitrogen fertilization and BRC1 expression in rice. They showed that high ammonium nitrate intake in the root environment induced a reduction of apical dominance through overexpression of miRNA393 in the buds; miRNA393 inhibits the expression of the genes involved in auxin synthesis and signaling (OsTIR1, OsAFB2, and OsIAA6) as well as OsTB1. In Arabidopsis, the brc1-2/brc2-1 double mutant exhibited a higher number of branches than the wild type, but low availability of nitrate reduced this effect. As root nitrate is widely known to induce CK biosynthesis and signaling events in the whole plant, and CK repress BRC1 expression, we cannot exclude that nitrate may affect BRC1 expression through CK modulation. In rice, the supply of a CK analog (BAP) or ammonium nitrate regulated SL amounts in the stem and the bud within 3 h after treatment, but nothing has been reported regarding BRC1 expression.

In Rosaceae as in many woody plants, nitrate is reduced and assimilated into amino acids directly in the roots; consequently, asparagine, arginine, aspartate, and glutamine are the main forms of nitrogen translocated to the buds via the xylem sap. In rose, asparagine is a major nitrogen form involved in bud outgrowth; this is in accordance with previous data showing that application of asparagine on the soil of olive trees or on the leaves of poplar trees contributed to enhance bud outgrowth and secondary axis elongation. In rice, a lack of cytosolic glutamine synthetase1;2 in the vascular tissues of axillary buds severely reduced their outgrowth independently of the SL level. In rose bush, sucrose, glucose, and fructose had to be associated to asparagine to allow for the buds to grow out in vitro. This effect involved the upregulation of IPT3 gene expression in the stem and in the vicinity of the bud and the downregulation of BRC1. In addition to a nutritional role, asparagine might also be a signal representing the nitrogen status of the plant, so as to counteract BRC1 expression through CK stimulation.

A BRC1-Related Regulatory Mechanism

Many studies ascribe an inhibitory function of mitotic cell activity to BRC1. This is because early results of EMSA (Electrophoresis Mobility Shift Assay) revealed the capacity of the TCP domain to associate specifically with the promoter element of the rice proliferating cell nuclear antigen (PCNA) gene. These cis-regulatory modules are indispensable for the transcriptional activation of the PCNA gene in rice meristem tissues, which seems to be an ancient and prevalent role of TCP transcription factors.

BRC1-mediated branching is repressed by the regulation of abscisic acid (ABA) metabolism (Figure 1). ABA is a plant hormone that plays important roles in many phases of the plant life cycle. Evidence for a role of ABA in regulating bud growth comes from the positive correlation between a reduction of ABA levels in buds and their release from dormancy. Moreover, the Arabidopsis era1 (ENHANCED RESPONSE TO ABA 1) mutant exhibited high sensitivity to ABA and reduced branching. In brc1 Arabidopsis mutants, the ABA-signaling pathway showed a significantly reduced response as compared to the wild type. Additional data revealed that the expression levels of two ABA markers, ABA-RESPONSE PROTEIN (ABR) and UDP-GLUCOSYL TRANSFERASE 74D1 (UGT74D1), were significantly upregulated in the wild type but not in brc1 mutants treated with low R:FR light. support a model in which ABA acts rather downstream of BRC1, because ABRE-BINDING FACTOR 3 (ABF3) and ABA INSENSITIVE 5 (ABI5), two key regulators of the ABA response that contain TCP-binding sites in their promoters, are upregulated in axillary buds upon BRC1 induction. They also indicated that BRC1 bound to and positively regulated three transcription factors: HOMEOBOX PROTEIN 21 (HB21), HOMEOBOX PROTEIN 40 (HB40), and HOMEOBOX PROTEIN 53(HB53). These three proteins, together with BRC1, enhanced NINE-CIS-EPOXICAROTENOID DIOXIGENASE 3 (NCED3) expression, the main ABA-biosynthesis enzyme, leading in turn to ABA accumulation in buds. This finding demonstrates a direct relationship between BRC1 and ABA signaling, and places ABA downstream of BRC1. Consistently, BRC1 expression was found to be insensitive to exogenous ABA application.

The TCP genes generally act by positively or negatively regulating the cell cycle. As a transcription factor, BRC1 could bind to the promoter region of various genes to regulate the branching process and participate to many regulatory mechanisms. In maize, TB1 can directly activate the tassels replace upper ears1 (tru1) gene that encodes an ankyrin-repeat-domain protein by binding to the promoter region of tru1. In Arabidopsis, bioinformatic analysis indicates that the promoter sequences of 1,950 genes expressed in the shoot bear the TCP-cis regulatory motif (5′-RRVMMMV-3′) and could be putatively regulated by AtBRC1. Based on Gene Ontology (GO) enrichment analysis, these putative target genes are thought to be mainly involved in metabolic processes, including amino acid metabolism [e.g., ALANINE-2-OXOGLUTARATE AMINOTRANSFERASE 1 (AOAT1); HYDROXYPYRUVATE REDUCTASE (ATHPR1)] and sulfur (e.g., sulfate transmembrane transporter (MOT2), sulfate transporter 1;2 (SULTR1;2)] (data not shown). We can therefore speculate that BRC1/TB1 might control bud outgrowth via various pathways, such as stimulating the ABA-signaling pathway and inhibiting cell division and cell metabolism.

Conclusion and Perspectives

BRC1/TB1/FC1 is an integrator gene involved in shoot branching, which fits well with the ability of BRC1/TB1/FC1 expression to integrate many endogenous and exogenous inputs (Figure 1). However, the detailed mechanism whereby these stimuli regulate BRC1 expression is still puzzling, and many mechanistic scenarios are plausible. Many questions are thus still open and include how CK and SL, the main two branching-related hormones, antagonistically regulate BRC1 expression, and which molecular actors could be involved. Similar questions concern the sugar-mediated downregulation of BRC1, and the molecular mechanism behind the combined effect of nutrients and hormones on BRC1 expression. In addition, the regulation of gene expression includes many aspects, such as epigenetic regulation, transcriptional regulation, post-transcriptional regulation, translational and post-translational regulation. The relevance of these mechanisms in the regulation of BRC1 expression deserves to be investigated in different biological contexts. Recent data showed that the protein interaction process also influences BRC1 expression. For example, the florigen proteins FLOWERING LOCUS T (FT) and TWIN SISTER OF FT (TSF) influence axillary meristem development via their interaction with AtBRC1; TIE1 (TCP interactor containing EAR motif protein 1), a transcriptional repressor identified as involved in the control of leaf development, controls shoot branching by interacting with BRC1. Additional protein partners may also interact with BRC1, including those related to the energy and nutrient statuses [Sucrose non-fermenting-related kinase (SnRK1)/Target of rapamycin (TOR kinase)]. Meanwhile, our knowledge about the molecular network governing the BRC1-dependent reduction of plant branching is still limited, and the only available data report that BRC1 action could be related to different biological functions such as cell proliferation, cell metabolism, hormone biosynthesis, ribosome biosynthesis, etc. All these findings indicate that further work is required to fully investigate the regulatory network behind the regulation and function of BRC1 in shoot branching.

Data Availability Statement

Publicly available datasets were analyzed in this study. This data can be found here: https://www.rosaceae.org.

Author Contributions

All the authors listed have contributed significantly to this manuscript. MW, J-MD, and SS managed this review and contributed to different sections. M-DP-G and LO contributed to the TCP transcription factor section. JB, SD-M, LH, and LC contributed to both hormonal and environmental factors sections, and M-ALM contributed to the nutrient section.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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