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Identification and molecular evolution of the GLX genes in 21 plant species: a focus on the Gossypium hirsutum

BMC Genomics volume 24, Article number: 474 (2023) Cite this article

Abstract

Background

The glyoxalase system includes glyoxalase I (GLXI), glyoxalase II (GLXII) and glyoxalase III (GLXIII), which are responsible for methylglyoxal (MG) detoxification and involved in abiotic stress responses such as drought, salinity and heavy metal.

Results

In this study, a total of 620 GLX family genes were identified from 21 different plant species. The results of evolutionary analysis showed that GLX genes exist in all species from lower plants to higher plants, inferring that GLX genes might be important for plants, and GLXI and GLXII account for the majority. In addition, motif showed an expanding trend in the process of evolution. The analysis of cis-acting elements in 21 different plant species showed that the promoter region of the GLX genes were rich in phytohormones and biotic and abiotic stress-related elements, indicating that GLX genes can participate in a variety of life processes. In cotton, GLXs could be divided into two groups and most GLXIs distributed in group I, GLXIIs and GLXIIIs mainly belonged to group II, indicating that there are more similarities between GLXII and GLXIII in cotton evolution. The transcriptome data analysis and quantitative real-time PCR analysis (qRT-PCR) show that some members of GLX family would respond to high temperature treatment in G.hirsutum. The protein interaction network of GLXs in G.hirsutum implied that most members can participate in various life processes through protein interactions.

Conclusions

The results elucidated the evolutionary history of GLX family genes in plants and lay the foundation for their functions analysis in cotton.

Peer Review reports

Background

Abiotic stresses such as drought, salinity and extreme temperature seriously threaten the growth of plants and limit the development of modern agriculture [1,2,3]. Under abiotic stress, photosynthesis and respiration of plants can produce excessive toxic aldehydes, such as methylglyoxal (MG), glyoxal (GO) and 3-deoxyglucosone (DOG), through enzymatic and non enzymatic pathways [4]. Biomacromolecules will be damaged by higher concentrations of MG, resulting in carbonyl stress. MG can react with arginine, lysine and cysteine to produce irreversible advanced glycation end products (AGEs) [5,6,7]; MG can also react with membrane lipids to produce irreversible advanced lipid peroxidation end products (ALEs) [8, 9]; In addition, MG can induce the production of ROS, and then generate oxidative stress, which damages proteins, DNA, RNA, lipids and biofilms [9,10,11,12,13]. At low concentration MG can also act as a signal molecule. It forms a signal network through interaction with other signal molecules, such as Ca2+, H2O2, nitric oxide (NO), hydrogen sulfide (H2S), to further regulate a variety of physiological processes and stress tolerance such as seed germination, plant growth, development, reproduction [4]. Therefore, it is particularly important to maintain the dynamic balance of MG in cells.

Plants have evolved many effective detoxification mechanisms, including glyoxalase system and non glyoxalase system [14]. The glyoxalase system is the main defense line, accounting for 99% of the total MG clearance [4]. There are three kinds of glyoxalase: glyoxalase I (GLXI), glyoxalase II (GLXII) and glyoxalase III (GLXIII) [15,16,17]. GLXI removes excess MG with glutathione (GSH) as a cofactor to produce the intermediate S-d lactoylglutathione (SLG), which is then converted into lactic acid by GlXII, and regenerates GSH [4, 18,19,20,21]. It can be seen that glyoxalase system can not only remove excess MG to maintain its homeostasis, but also maintain redox homeostasis in cells by regulating GSH regeneration. GLXIII is a glutathione independent glyoxalase, which can directly catalyze the irreversible conversion of MG to lactic acid without the participation of glutathione or other cofactors [22,23,24,25].

GLXs are important enzymes for plants to cope with the stress of aldehydes and ketones and abiotic stress [26,27,28,29]. So far, there have been some studies on the molecular function of the GLX genes, for example, GLXI can participate in cell proliferation in soybean [30] and Amaranthus paniculatus [31], be involved in abiotic stress in tomato [32], pumpkin [33], onion [33] and wheat [34], improve stress resistance in tobacco [35], black gram [36], Arabidopsis [37], mustard [38] and rice [39]. GLXIs and GXIIs can participate in salt stress in rice [40, 41], but not on its molecular evolution. Evolutionary studies of gene families can not only systematically elucidate gene members, sequence structure and molecular functions, but also help to explore biological characteristics of species, such as growth and development, transcriptional regulation and environmental adaptation, laying a solid foundation for biological breeding research [42,43,44,45]. In recent years, global water shortage, soil salinization and frequent extreme weather have seriously affected the growth environment of crops [46,47,48,49,50]. Cotton is an important Cash crop in the world, but systematic identification and analysis of GLX family in cotton have not been reported yet. In this study, GLX genes were identified in different green plants, and an evolutionary analysis was performed. We focused on the identification, evolutionary relationship and function of GLX genes in Gossypium hirsutum. The results of this study provide a theoretical basis for the evolution and biological functions of the GLX genes in plants and the study of GLX gene family will help us understand its potential application in cotton.

Results

Identification of GLX genes in green plants

In order to study the evolutionary relationship of GLX genes in green plants, 620 GLX genes were identified in 21 plant species, which represent the evolutionary relationship of 10 kinds of green plants, including green algae, charophytes, bryophytes, lycophytes, pteridophytes, gymnosperms, basal angiosperms, monocots, basal eudicots, and core eudicots (Fig. 1 and Table S2). The GLX gene family has already appeared in green algae, with 14 and 15 GLX genes in O. lucimarinus and V. carteri, respectively. GLX genes in other plants were more than green algae (Fig. 1). Notably, from Algae to Bryophytes, there was an explosion of GLX number, leading to 47 members in P. patens. There were the most GLX genes (80) in G.hirsutum, which could be due to it is allotetraploid. This indicates that GLX family undergo expansion in the process of evolution. Existence of GLXs in both lower and higher plants suggested that GLX genes could be important for plants. In most species, GLXI and GLXII are more abundant than GLXIII, and gene numbers varied more in different plants. In order to study the homologous domain and preservation degree of GLX protein in evolution, MEME (http://meme-suite.org/tools/meme, accessed on 18 November 2022) was used for motif analysis, and 20 conservative motifs were identified in GLXI, GLXII, and GLXIII respectively. The results showed that motif generally showed an expansion trend in the evolutionary process. For example, motif 3, motif 9 and motif 15 in GLXI were not found in green algae, and gradually appeared from charophytes (Figure S1). In GLXII, motif 19 and motif 20 were not found in green algae, and began to appear in charophytes (Figure S2). In GLXIII, motif 2, motif 3, motif 8, motif 9, motif 14, motif 16 and motif 20 did not appear in green algae, and began to be found in charophytes with evolution (Figure S3).

Fig. 1
figure 1

Phylogenetic relationships among 21 plant species. Different background colors in the phylogenetic tree show different lineages. The right side shows the numbers of GLXI, GLXII, and GLXIII genes in 21 different plant species, and the total number of GLX genes in each species

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Analysis of putative cisacting elements in GLX promoters

The cis-acting element is essentially a DNA sequence, which is a binding site to transcription factors, and regulates the precise initiation and conversion efficiency of gene transcription by binding to transcription factors. The 2-kb promoter sequence of GLX genes upstream in 21 plant species was analyzed using PlantCARE database [51]. The results showed that different types of Cis-acting element were found in the GLX genes promoter (Fig. 2 and Table S3). As shown in Fig. 2, among them, the core element CAAT box which related to the regulation of nopaline synthase, and the core element TATA box which related to transcription, are the most abundant and exist in most species [52]. Various phytohormone responsive elements have also been found, such as ABRE, an ABA response element [53], ERE, an ethylene-responsive element [54], CGTCA-motif, MYC, chs-CMA1a and TGACG-motif which belong to MeJA-responsive element [55], GARE-box, P-box, TATC-box and Pc-CMA2c which belong to GA-responsive element [56], as-1, SARE, sbp-CMA1c and TCA-element which belong to salicylic acid-responsive element [57], and TGA-element, AuxRR-core and GA-box which belong to IAA-responsive element, this suggests that different phytohormones can regulate the expression of GLXs. Various light-related elements such as G-box, Box 4, GT1-motif, GATA-motif, Sp1, I-box, 3-AF1 binding site, TCT-motif, and Gap-box were also observed [58]. The stress-responsive elements were detected in the promoter of some GLXs, such as F-box [59], MBS (MYB binding site involved in drought-inducibility), ARE (anaerobic induction element) [60], STRE (stressresponsive element) [61], LTR (low temperature-responsive elements) [62], dehydration-responsive element (DRE1 and DRE-core) [63], TC-rich repeats (defence and stress-responsive element), wound-responsive element (WRE3 and WUN-motif) [64], and GC-motif (enhancer-like element involved in anoxic specific inducibility). Some growth and development elements were also predicted, such as CAT-box (cis-acting regulatory element related to meristem expression), GCN4_motif (cis-regulatory element involved in endosperm expression) [65], circadian (cis-acting regulatory element involved in circadian control) [66] and RY-element (cis-acting regulatory element involved in seed-specific regulation) [67]. The results indicated that GLXs are involved in plant growth and development as well as environmental stress responses.

Fig. 2
figure 2

Predicted cis-elements in the promoter regions of GLX genes in 21 species. The species names were shown on the right, and the cis-acting elements were displayed at the bottom. Scale bars at the right represented log2 (FPKM + 1). Different colours represent the different numbers of cis-acting elements

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Phylogenetic analysis of GLX genes family in cotton

In order to further study the evolutionary relationship of GLX proteins in cotton. Total 235 GLX genes were identified in G.hirsutum, G. arboreum, G.raimondii and G.barbadense. Phylogenetic tree was constructed using the amino acid sequences of all the GLX proteins from four cotton species (Fig. 3). The phylogenetic tree showed that all GLX proteins in cotton were divided into two groups. The first group consists of 127 members and is divided into two subgroups. The second group was divided into two subgroups and contained 108 members. All GLXI are distributed in group I, GLXII and GLXIII are mostly distributed in Group II, indicating that the members of GLXII and GLXIII are more similar in evolution.

Fig. 3
figure 3

Phylogenetic analysis and subfamily classification of the GLX genes in G. hirsutum (GH_GLX), G. barbadense (GB_GLX), G. arboreum (Ga_GLX) and G. raimondii (Gorai_GLX). The phylogenetic tree was constructed with MEGA 6.0 using the neighbor-joining model with 1000 bootstrap replicates. All 235 GLXs in cotton were divided in to four subgroups, which were highlighted by different colors

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Collinearity analysis of the GLX gene family in cotton

The G. hirsutum and G.barbadense are evolved due to hybridization between an A-genome species (ancestor of G.herbaceum or G.arboreum) and a D-genome species (ancestor of G.raimondii) [68]. To understand the evolutionary relationships of GLX genes in cotton, a relative syntenic map of GLX genes from the four cotton species was fabricated (Fig. 4). According to MCScan analysis, 103 duplicate gene pairs were found between diploid G. arboreum and tetraploid G.hirsutum, and also 103 between diploid G.arboreum and tetraploid G.barbadense. Meanwhile, 113 and 112 duplication gene pairs were found between diploid G.raimondii and tetraploid G.hirsutum, diploid G.raimondii and tetraploid G.barbadense, respectively. The GLX genes of G.Aimondii has a good collinear relationship with the GLX genes of G.hirsutum and G.barbadense on chr03, chr09, chr10 and chr11. The GLX genes of G.arboreum has a good collinear relationship with the GLX genes of G.hirsutum and G.barbadense on chr10. The result shows that during the evolution of GLXS, chromosome may have undergone small deletion, duplication and reshuffling [69].

Fig. 4
figure 4

The sub-genome distribution and synteny analysis of cotton GLX genes. The blue lines represents duplicated GLX pairs, the gray lines represents collinear blocks

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Expression analysis of GLX genes under stress in G.hirsutum

In previous studies, it was reported that members of the GLX family were associated with stress response in rice. In order to explore whether the GLXs of G. hirsutum were also related to stress responses, gene expression profiles after stresses treatment were obtained from public RNA-seq data. It can be seen that the expression levels of GLX15, GLX19, GLX20, GLX24, GLX25, GLX28 and GLX38 changed under 37℃ treatment (Fig. 5, Figure S4 and Table S4), suggesting that these seven genes may respond to high temperature.

Fig. 5
figure 5

Expression of GLX genes in G.hirsutum under heat treatment. The phylogenetic relationships were displayed on the left, the gene names were shown on the right, and the time after heat treatment is displayed at the bottom. Scale bars at the right represented log2 (FPKM+ 1). Different colours represent the different expression levels of GH_GLXs

Full size image

GLX20, GLX28 and GLX38 have the highest expression level in anthers, GLX19 is mainly expressed in roots, GLX15 is mainly expressed in leaves and roots, and GLX24 and GLX25 are mainly highly expressed in leaves(Figure S5 and Table S5). To validate the expression change of 7 GLX genes under heat treatment, qRT-PCR was performed to verify their expression in leaves at 0 h, 1 h, 3 h, 6 h, 12 h, and 24 h after heat treatment. The qRT-PCR results were almost consistent with transcriptome data. The trend of GLX15, GLX19, GLX20, GLX28 and GLX38 was roughly the same, the expression levels of all genes were the highest at 1 h after heat treatment, and began to decrease significantly at 3 h, and then almost leveled off, GLX38 was almost not expressed after 3 h treatment. The expression trend of GLX24 and GLX25 was almost the same, the expression decreased after 1 h heat treatment, reached the highest level at 3 h, and then tended to be stable. In short, the expression of these seven genes roughly decreased with the passage of heat treatment time, and responded to heat treatment (Fig. 6).

Fig. 6
figure 6

The expression patterns of 7 GH_GLXs at different time after heat treatment by qRT-PCR. The values are standardized. GhUBQ7 (DQ116441) was used as the internal control. Each experimnet was performed in three biological replicates, and the error bars represent mean ± SD; n = 3. (**p < 0.01, ***p < 0.001, Student’s t-test)

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Prediction of GLX protein interactions in G.hirsutum

To further detect the potential roles of GLX family members, we investigated the interaction of the GLX proteins in G.hirsutum using the STRING database [70]. The results showed that most members of GLX family can interact with each other, and a few could interact with other proteins (Fig. 7). For instance, GLX61 and GLX58 can interact with A0A1U8KBF4, A0A1U8HUQ9, A0A1U8PER4 and A0A1U8NZA9 which related to cleavage. GLX52 and GLX45 can interact with A0A1U8N6I4, A0A1U8KCE2, A0A1U8HY12 and A0A1U8J6K2, which are related to segmentation, flowering time, nucleotide polymerization and phosphorylation, respectively. This implies that GLX proteins may function as homologous protein complex and participate in various biological processes through protein interactions.

Fig. 7
figure 7

Functional network assembly of the GLX proteins in G.hirsutum. Red letters represent the GLX proteins. Light blue and purple lines stand for represent known interactions determined by the database and experiments, respectively. Green, red, and blue lines stand for predicted interactions from gene proximity, fusion, and symbiosis, respectively. Light green, black, and gray lines represent other interactions from text mining, co-expression, and protein homology, respectively. Empty nodes: proteins of unknown three-dimensional structure

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Discussion

Glyoxalase was discovered in animal in 1913 and not reported in plants until the end of the 20th century [28]. In plants, the GLX gene family has an important impact on growth, development and coping with abiotic stresses [71]. In this study, a total of 620 GLX genes were identified in 21 green plants, and GLX genes were distributed in all the 21 species, but the number of GLXI and GLXII in each species was far greater than that of GLXIII (Fig. 1 and Table S2), this indicates that GLX genes are widely distributed in plants, but the number of GLXIII is relatively small.

The promoter is DNA sequence located in the upstream of the structural gene and recruit RNA polymerase for transcription initiation [72]. The specificity of gene expression depends on cis-regulatory elements [73]. Therefore, 2000 bp promoter sequences of all the GLX genes were extracted, and the cis-acting elements were predicted using the PlantCRAE. Various types of elements were found in the promoter sites of GLX genes in green plants. The distribution of cis-acting elements among different species was different, as shown in a large number of cis-acting elements were predicted to be related to transcription, various hormones, and stresses response, cell cycle, and development. The results indicated that GLXs are might involved in plant growth and development as well as environmental stress responses (Fig. 2).

Cotton is one of the most important cash crops in the world. At the same time, cotton is also a crop with strong drought resistance and salt tolerance, which is suitable for planting in moderate drought conditions or mild saline-alkali land. Based on this characteristic of cotton, we mainly studied GLX gene in cotton. A total of 235 GLXs family members were identified in four cultivated cotton species, and the phylogenetic tree divided all GLXs into two groups, GLXI distributed in the first subgroup, GLXII and GLXIII mostly distributed in the second subgroup (Fig. 3). This suggests that GXLII and GLXIII are relatively close in evolution. According to previous studies, although GLXII and GLXIII are close in evolution, there are still great differences in function. In terms of function, GLXII and GLXI have similar modes of action, both catalyzing cascade reactions [18,19,20,21]. Unlike GLXI and GLXII, GLXIII can directly convert MG irreversibly into non-toxic lactic acid without glutathione glyoxylase [22,23,24,25]. The relative syntenic map of GLX genes from the four cotton species indicate that chromosome may have undergone small deletion, duplication and reshuffling during the evolution of GLXs (Fig. 4).

The potential role of the GLX family members was further explored by predicting G.hirsutum transcriptome data, quantitative real-time PCR analysis (qRT-PCR) and protein interaction networks. The results showed that the expression levels of GLX15, GLX19, GLX20, GLX24, GLX25, GLX28, and GLX38 changed under high temperature treatment, indicating that they were responsive to high temperature treatment (Figs. 5 and 6). It was also found that the expression levels of these seven genes were different in different tissues. GLX20, GLX28, and GLX38 were mainly expressed in anthers, GLX19 was highly expressed in roots, GLX15 was expressed in leaves and roots, and GLX24 and GLX25 have high expression level mainly in leaves. (Figure S4 and Table S5). This indicates that although GLX exists widely in nature, its expression levels in different tissues and organs are different, which is consistent with the results of previous studies. Meanwhile, the protein interaction prediction indicated that most GLX genes interact with each other. GLX61, GLX58, GLX52 and GLX45 may be involved in cleavage, flowering time, nucleotide polymerization and phosphorylation by different protein interactions (Fig. 7).

Conclusion

In this study, 620 GLX genes were identified from 21 plants. It was found that GLX genes are distributed in lower and higher plants and widely exist in nature, but their expression levels are different in different tissues and organs. We focused our analysis on GLX genes in cotton and found that some of them might be involved in abiotic stress and some other life processes through interacting proteins.

Materials and methods

Genome-wide identification of GLX family genes in plants

In this study, the genome-wide data of 21 plant species were analyzed. The genomic, CDS and protein sequences of G. hirsutum (ZJU), G. arboreum (CRI), G. barbadense (ZJU) and G.raimondii (JGI) were downloaded from CottonGen (https://www.cottongen.org, accessed on 18 November 2022) [74,75,76]. The genomic, CDS and protein sequences of Arabidopsis was downloaded from TAIR (https://www.arabidopsis.org/, accesses on 18 November 2022) [77]. The genomic, CDS and protein sequences of Klebsormidium nitens and Theobroma cacao were downloaded from NCBI. The sources of genomic data for others species are listed in Table S1. GLXI genes domain information (PF00903, PF12681), GLXII genes domain information (PF00753), and GLXIII genes domain information (PF01965) were downloaded from Pfam database(https://pfam.xfam.org, accesses on 18 November 2022) [78], Then, we used HMMER3.0 software (http://www.hmmer.org/, accessed on 18 November 2022) with an e-value of 1 × 10− 5 as the threshold to acquire GLX protein sequence. Use online tool SMART (http://smart.embl-heidelberg.de/, accessed on 18 November 2022) to further analyze the domain, remove the sequence without GLX domain, and finally obtain all genes of GLX family [79].

Analysis of Cis-acting elements in the promoter regions of GLX genes

A 2.0 kb of promoter sequence upstream from the transcription start site in each GLX genes were extracted from the genome database and analyzed using PlantCare (http://bioinformatics.psb.ugent.be/webtools/plantcare/html, accesses on 18 November 2022) online software to predict the putative cis-acting regulatory elements [51]. After classifying and counting the results [80], TBtools software was used for visualization [81].

Construction of phylogenetic tree of GLX family in cotton

Multi-sequence alignment of all GLX protein sequences was carried out using Clustal X [82], and phylogenetic trees were constructed using the MEGA software proximity method (version 6.0) (Neighbor-Joining, NJ) [83] with the calibration parameter Bootstrap being set to 1000. The online software Evolview (https://www.omicsclass.com/article/671, accessed on 10 July 2021) was used to modify the evolutionary tree [84].

Collinearity analysis of the GLX genes family in cotton

The gene duplication analysis of four cotton species were conducted using MCScanX software [85]. The synonymous substitution (Ks) and nonsynonymous substitution (Ka) of each duplicated gene pairs were calculated in TBtools with default parameters [81]. Gene duplication and synteny relationship were visualized by TBtools [81].

Expression of GLX genes under heat treatment in G.hirsutum, Sample collection, RNA extraction, cDNA synthesis, and qRT-PCR analysis

Transcriptome data were downloaded from the Cotton Omics Datebase (http://cotton.zju.edu.cn/10.rnasearch.html, accessed on 18 November 2022). The heat map generated by TBtools software is used to display the relative expression level [81]. Upland cotton cultivar Z12 was planted under controlled conditions. Heat treatment was applied to plants at three leaf stage. Leaves were collected from treated plants after 0 h, 1 h, 3 h, 6 h, 12 and 24 h of treatment. Three biological repeats were collected in each stage. All samples were immediately frozen in liquid nitrogen and stored at -80 °C. Plant total RNA was extracted by the RNAprep Pure Plant Plus Kit (Polysaccharides&Polyphenolicsrich) (DP441) (Tiangen, Beijing, China). The reverse transcription kit was the Prime Script™ II 1st Strand cDNA Synthesis Kit (Genstar, Beijing, China). It was used to reverse the extracted RNA to obtain the first-strand cDNA for transcriptomic and qRT-PCR analysis. Specific primers were designed according to the CDS sequence of the GH_GLX genes on the primer-blast of NCBI website (Table S6). GhUBQ7 (DQ116441) was used as the internal control. qRT-PCR was performed with LightCycler 480 Real-Time PCR system (Roche, Switzerland). Obtaining gene expression data using three biological replicates. Moreover, the relative quantitative analysis of gene expression was carried out by the 2−∆∆ Ct method with three independent replicates [86].

Prediction of GLX protein interactions in G.hirsutum

The prediction of GLX protein interactions was established using the STRING database (https://cn.string-db.org/, accessed on 18 November 2022) [70], Parameter uses the default values.

Data Availability

The following information was supplied regarding data availability:

Data is available at NCBI SRA, accession numbers: PRJNA490626(https://www.ncbi.nlm.nih.gov/sra?linkname=bioproject_sra_all&from_uid=490626) and PRJNA248163 (https://www.ncbi.nlm.nih.gov/sra?linkname=bioproject_sra_all&from_uid=248163).

Extra data has been appended as supplementary Tables.

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Acknowledgements

We are deeply grateful to State Key Laboratory of Cotton Biology, Cotton Research Institute of Chinese Academy of Agricultural Sciences for providing the experimental platform, and the editors and reviewers for their valuable comments.

Funding

The following grant information was disclosed by the authors: Hainan Yazhou Bay Seed Laboratory (B21HJ0222); the Project of Sanya Yazhou Bay Science and Technology City (SCKJ-JYRC-2022-92); National Natural Science Foundation of China (31901581);Central Public-interest Scientific Institution Basal Research Fund (1610162022054) and The Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences.

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Authors and Affiliations

  1. Zhengzhou Research Base, State Key Laboratory of Cotton Biology, School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Menglin Xu, Huixin Jiao, Xiang Zhang, Yi Yang, Guoli Song & Hailiang Cheng

  2. State Key Laboratory of Cotton Biology, Cotton Research Institute of Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China

    Menglin Xu, Dongyun Zuo, Qiaolian Wang, Limin Lv, Youping Zhang, Huixin Jiao, Xiang Zhang, Yi Yang, Guoli Song & Hailiang Cheng

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  1. Menglin Xu
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  2. Dongyun Zuo
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  9. Guoli Song
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  10. Hailiang Cheng
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Contributions

Menglin Xu designed the research plan, conducted the experiment and drafted the manuscript; Dongyun zuo, Qiaolian Wang, Limin Lv and Youping Zhang participated in the discussion and provided comments. Huixin Jiao, Xiang zhang and Yi Yang collect and analyze the test data. Hailiang Cheng and Guoli Song supervised all phases of the project and revised the manuscript. All authors have read and approved the final manuscript.

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Correspondence to Guoli Song or Hailiang Cheng.

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Additional file: Figure S1. Motif analysis of GLXI gene in 21 plant species

Additional file: Figure S2. Motif analysis of GLXII gene in 21 plant species

Additional file: Figure S3. Motif analysis of GLXIII gene in 21 plant species

Additional file: Figure S4. Expression of GLX genes under abiotic stress in G.hirsutum

Additional file: Figure S5. Tissue-specific expression of seven differentially expressed genes

Additional file: Table S1. The genome data sources for the species used in this study

Additional file: Table S2. GLX gene IDs in 21 plant species

Additional file: Table S3. List of identified cis-elements in the putative promoter region of GLX genes

Additional file: Table S4. Expression of GLX genes under abiotic stress in G.hirsutum

Additional file: Table S5. Tissue-specific expression of seven differentially expressed genes

Additional file: Table S6. List of primers used in qRT-PCR experiments

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Xu, M., Zuo, D., Wang, Q. et al. Identification and molecular evolution of the GLX genes in 21 plant species: a focus on the Gossypium hirsutum. BMC Genomics 24, 474 (2023). https://doi.org/10.1186/s12864-023-09524-w

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Keywords

BMC Genomics

ISSN: 1471-2164

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