Abstract
MeFtsZ2-1 is a key gene for plant plastid division, but the mechanism by which MeFtsZ2-1 affects pigment accumulation in cassava (Manihot esculenta Crantz) through plastids remains unclear. We found that MeFtsZ2-1 overexpression in cassava (OE) exhibited darker colors of leaves, with increased levels of anthocyanins and carotenoids. Further observation via Transmission Electron Microscopy (TEM) revealed no apparent defects in chloroplast structure but an increase in the number of plastoglobule in OE leaves. RNA-seq results showed 1582 differentially expressed genes (DEGs) in leaves of OE. KEGG pathway analysis indicated that these DEGs were enriched in pathways related to flavonoid, anthocyanin, and carotenoid biosynthesis. This study reveals the role of MeFtsZ2-1 in cassava pigment accumulation from a physiological and transcriptomic perspective, providing a theoretical basis for improving cassava quality.
Introduction
Cassava (Manihot esculenta Crantz), belonging to the Euphorbiaceae family, is native to the southern Amazon basin and is widely cultivated in tropical and subtropical regions, ranking as the world’s sixth-largest crop [1]. Despite the starch-rich storage roots, frequent consumption can lead to hidden hunger due to low levels of other nutrients [2]. In recent years, leaves have gained recognition as a substitute source of protein and micronutrients in sub-Saharan Africa and parts of Asia [3]. Research indicates that cassava tuberous roots with different flesh colors exhibit varying nutritional profiles, with darker-colored cassava potentially harboring elevated levels of secondary metabolites and nutrients, particularly carotenoids and flavonoids [ RNA-seq analysis of differentially expressed transcripts in WT and OE leave. (A) Volcano plot of the number of DEGs in leaves. (B) Bar graph of the number of DEGs in leaves. (C) Heatmap of the DEGs in leaves. WT, wild-type cassava. OE, MeFtsZ2-1 overexpression cassava
GO classification analysis was performed on the DEGs of OEL/WTL (Fig. 5). In the OEL/WTL comparison, a majority of DEGs were categorized under defense response clusters in relation to biological processes. DEGs associated with cellular components were linked to cell nucleus, plasma membrane, cytoplasm, membrane components, and chloroplasts. The functionality of DEGs was primarily related to protein binding, ATP binding, and DNA binding transcription factor activity.
Gene ontology (GO) enrichment classification of differentially expressed genes in cassava leaves. All annotated unigenes were divided into three functional GO categories: biological process, cellular component and molecular function
KEGG pathway analysis showed that the main pathways of OEL/WTL included glycolysis, gluconeogenesis, citric acid metabolism, fatty acid degradation, glycolysis/gluconeogenesis, phenylpropionic acid biosynthesis, anthocyanin biosynthesis and carotenoid metabolism (Supplementary Figure S3A).
Identification of genes involved in chlorophylls, carotenoids and anthocyanins biosynthesis pathways
A comparison between OEL/WTL revealed a total of 26 differentially expressed genes (DEGs) within the chlorophylls, carotenoids and anthocyanins synthesis pathway (Supplement Table S3). We identified 6 DEGs associated with chlorophylls biosynthesis and metabolism pathways. Among these, transcription factor GLABRA 3 (GL3), Protein STAY-GREEN homolog (SGR), ABC transporter C family member 3 (ABCC3), transcription factor PIF1 (PIF1), and putative U-box domain-containing protein 42 (PUB42) exhibited higher expression levels in OEL. We identified six DEGs related to carotenoids biosynthesis in OEL, in which the expression of indole-3-acetaldehyde oxidase (AAO1) was up-regulated, 9-cis-epoxycarotenoid dioxygenase NCED3 (NCED3) was down-regulated (Fig. 6). The expression levels of genes related to the anthocyanins synthesis pathway, such as 4-coumarate–CoA ligase (4CL), Naringenin,2-oxoglutarate 3-dioxygenase (F3H), and UDP-glycosyltransferases (UGT), were significantly increased in OEL (Fig. 6).
Heatmaps of DEGs related to anthocyanidin and β-carotenoid biosynthesis in the WT and OE cassava. PAL, phenylalanine ammonia lyase; C4H, cinnamate 4-hydroxylase; 4CL, 4coumaroyl CoA ligase; CHS, chalcone synthase; CHI, chalcone isomerase; F3H, flavanone 3-hydroxylase; DFR, dihydroflavonol-4-reductase; LDOX, leucoanthocyanidin dioxygenase; ANR, Anthocyanidin reductase; LAR, leucocyanidin reductase; UGT, UDP glycosyltransferase; PSY, phytoene synthase; PDS, phytoene desaturase; Z-ISO, ζ-carotene isomerase; ZDS, ζ-carotene desaturase; LYCE, lycopene epsilon-cyclase; BCH, β-carotene hydrolase; ZEP, zeaxanthin epoxidase; VDE, violaxanthin de-epoxidase; NCED, 9-cis-epoxycarotenoid dioxygenase; ABA2, xanthoxin dehydrogenase; Significant changes in gene expression levels are shown by the intensities of colors expressed in log2 values. WT, wild-type cassava. OE, MeFtsZ2-1 overexpression cassava
Identification of transcription factors (TFs)
In the transcriptomic databases of OEL and WTL, 49 differentially expressed genes (DEGs) encoding transcription factors (TFs) were identified and classified into 11 different TF families (Supplementary Figure S3B). The WRKY family had the highest number of DEGs (10 genes), followed by MYB (9 genes), bHLH (8 genes), AP2-ERF (5 genes), and TFIID (2 genes). These results indicate that the MeFtsZ2-1 gene can have multiple regulatory mechanisms in leaves.
DEGs associated with hormone signaling pathways
In OE, a total of 41 differentially expressed genes (DEGs) related to plant hormones were identified in leaves, respectively (Supplement Table S4 and Figure S4). Compared to the WT, within the auxin signaling pathway, auxin-induced proteins (AUX), auxin-responsive protein genes (SAUR/IAA), and auxin transporter protein (LAX) exhibited higher expression levels in the OEL. However, indole-3-acetic acid-amido synthetases (GH3.1/GH3.9) and auxin response factor (ARF) showed decreased expression in OEL. In the salicylic acid signaling pathway, the expression of transcription factor TGA (TGA1) and pathogenesis-related protein 1 (PRB1) was upregulated in OE. Within the gibberellin signaling pathway, chitin-inducible gibberellin-responsive protein 1 (CIGR1) was significantly downregulated in OEL, while scarecrow-like transcription factor PAT1 (PAT1) and transcription factor PIF1 (PIF1) were markedly upregulated. In the ABA signaling pathway, abscisic acid receptors (PYL) and serine/threonine-protein kinase (SRK2A) were upregulated, whereas probable protein phosphatase 2 C (PP2C51), transcription factor HHO (HHO2), and histidine kinase 5 (AHK5) were downregulated.
Quantitative real-time PCR (qRT-PCR) analysis
Ten randomly selected DEGs from both leaves and tuberous roots were subjected to qRT-PCR analysis to validate the reliability of the transcriptome sequencing data (Supplement Table S5). The qRT-PCR results were consistent with the transcriptomic data, indicating the high reliability of the transcriptome data (Fig. 7).
Ten candidate genes were randomly selected from leaves for qRT-PCR verification. All measurements were replicated three times. Vertical bars represent S.E. of the mean (n = 3). Data are mean ± SE of three individual experiments, each performed in triplicate (*: p < 0.05). WT, wild-type cassava. OE, MeFtsZ2-1 overexpression cassava
Discussion
The increase in substances such as anthocyanins and carotenoids in crops is beneficial not only for human health but also for enhancing survival capabilities in stressful environments [20]. Currently, most studies focus on elevating the levels of carotenoids and anthocyanins in crops by manipulating specific genes involved in their biosynthesis. However, research on increasing the levels of carotenoids and anthocyanins by altering their synthesis sites has not been reported.
Plastids are membrane-bound organelles responsible for storing substances such as chlorophylls and carotenoids in plant cells [21]. Severe abnormalities in plastid division have been observed in mutants like ARC5 and ARC6, leading to a decrease in chlorophyll content within the chloroplasts [22, 23]. Manipulating plastid division-related genes such as ARC3 and PDV in Arabidopsis thaliana can alter the number of plastids, subsequently affecting carotenoid levels [14]. Plastoglobule are the place where carotenoids accumulate [24]. Stimulation to increase the number of plastoglobule in melon (Cucumis melo) can increase the accumulation of carotenoids [25]. In our study, we observed that overexpression of MeFtsZ2-1 resulted in elevated chlorophyll and carotenoid levels in cassava leaves. Moreover, there was a notable increase in the number of plastid stromules in OEL, implying that the overexpression of MeFtsZ2-1 may augment chlorophylls and carotenoids content by expanding the storage capacity within plastids. Additionally, the content of chlorophylls and carotenoids in plants is influenced by their synthesis and degradation rates. Transcription factors known as phy-interacting factors (PIFs), members of the basic helix-loop-helix family, can regulate the expression of genes such as protochlorophyllide oxidoreductase (POR), ferrochelatase (FeChII), and heme oxygenase (HO3), which control chlorophyll synthesis [26]. In our study, we observed a significant upregulation of PIF1 in OEL, suggesting a potential role in chlorophyll synthesis regulation. The NCED gene, belonging to the carotenoid cleavage oxygenase (CCO) family, negatively regulates carotenoid synthesis in various species by inhibiting carotenoid degradation [27]. Transcriptome data revealed a significant decrease in NCED expression in carotenoid pathways in OEL, suggesting that overexpression of MeFtsZ2-1 may not only affect storage space but also the expression of genes involved in chlorophyll and carotenoid metabolism pathways.
In many plants such as sweet potatoes (Ipomoea batatas L.), strawberries (Fragaria×ananassa), pears (Pyrus ussuriensis), and sweet cherries (Prunus avium L.), changes in plant color phenotypes are often associated with the synthesis, transport, and accumulation of anthocyanins [28,29,30,31]. In this study, we observed that overexpression of MeFtsZ2-1 led to an increase in anthocyanins content within the plant, resulting in darker coloration of leaves. RNA-seq comparative analysis revealed significant upregulation of the expression of genes such as 4CL, F3H, CHS, and UGT in the OE. Previous research has shown that overexpression of 4CL and F3H in plants can promote the accumulation of anthocyanins [32]. Taken together, after the overexpression of the MeFtsZ2-1 gene, the expression of genes controlling anthocyanin synthesis increased, and the expression of genes regulating anthocyanin degradation decreased, leading to the accumulation of anthocyanins in the OEL. Furthermore, various transcription factors can regulate pigment metabolism by modulating the expression of genes involved in anthocyanin and carotenoid biosynthesis, thereby influencing anthocyanin and carotenoid content and altering plant flower color [33]. In our study, we observed the significant upregulation of MYB and bHLH family genes in OE. These upregulated transcription factors are likely responsible for the differential expression of genes involved in the pigment metabolic pathways. Based on these results, we speculate that these TFs and differentially expressed genes play a crucial role in anthocyanin metabolism in OE. However, further research is needed to elucidate how the MeFtsZ2-1 gene induces color changes.
The biosynthesis pathways of carotenoids and anthocyanins in plants are regulated by various plant hormones, each of which has distinct effects on their synthesis. Exogenous application of auxin and ethylene increases carotenoid content in Chlorella (Chlorella sp. BR2) and loquat (Eriobotrya japonica Lindl cv. Algerie), and ethylene also enhances the expression of carotenoid biosynthesis genes and transcription factors [34,35, In this experiment, South China No. 8 (SC8) cassava and MeFtsZ2-1 overexpression cassava variety, developed at the School of Life Sciences of Hainan University, were employed as experimental materials. The MeFtsZ2-1 gene sequence and cloning method were provided by Mengting Geng [41]. The method of MeFtsZ2-1 transgenic cassava was performed according to the method of Yajie Wang [42]. We extracted cassava DNA and RNA according to the DNA extraction kit (Vazyme, Nan**, China) and the RNA extraction kit (Vazyme, Nan**, China). The extracted cassava DNA and RNA were used as templates for RT-PCR and RT-qPCR analysis. According to the results of PCR and quantitative real-time PCR, we selected OE#2 as the follow-up experimental material. Leaves (the fourth leaves under the apical buds of 8-month-old cassava) and tuberous roots (8-month-old cassava) were harvested from the tropical crop experimental base of Hainan University (30°52’N 121°54’E), with each sample having three biological replicates. Following collection, each sample was divided into three equal parts. One portion of the samples was rapidly frozen using liquid nitrogen and stored at -80 °C for subsequent RNA extraction and transcriptome sequencing. The second portion of leaves was fixed with 2.5% glutaraldehyde, while the third portion, constituting fresh samples, was used to measure various physiological indices. Leaves were initially cut into 1 mm cubes, excised, and promptly fixed using 2.5% (v/v) glutaraldehyde (containing 0.05 M sodium cacodylate/HCl, pH = 7) for 2 h at room temperature, followed by overnight incubation at 4 °C. After rinsing with buffer, the samples were immersed in 1% (w/v) buffered osmium tetroxide at 22 °C for 5 h. Subsequently, prior to embedding in resin, the samples underwent rinsing in distilled water and dehydration in ethanol. Thin sections were stained with uranyl acetate and lead citrate for 1 h and 15 min, respectively. Stained sections were examined at 100 kV using a TEM (JEOL JEM-1200EXII UK, Hertfordshire, UK), and images were captured. Lyophilized leaves (0.3 g) were immersed in 5 mL of methanol containing 0.1% HCl and stored in darkness overnight. The resulting supernatant was subjected to centrifugation at 5000 rpm for 10 min, and the absorbance was subsequently measured at 525 nm using a UV spectrophotometer (UV-1800PC, Shanghai). Anthocyanin content was quantified based on a standard curve generated with cyanidin-3-O-glucoside. Fresh leaves were sliced and individually weighed. Subsequently, 1 g of leaf material was placed into centrifuge tubes containing 15 mL of 95% ethanol (v/v). During the extraction process, the centrifuge tubes were vigorously shaken multiple times, and the samples were stored in the dark at 4 °C in a refrigerator for 24 h until the leaves became completely colorless. Blank controls were prepared using 95% ethanol. Chlorophyll a content was calculated as follows: Chl a = 13.95A665 nm − 6.88A649 nm. Chl b = 24.96A649 nm − 7.32A665 nm. Chl = (Chl a + Chl b) × V ÷ 1000 W [43]. Fresh samples of cassava leaves and tuberous roots were homogenized, followed by rapid transfer to pre-cooled centrifuge tubes. The analytical procedure utilized a C30 column (YMC, 4.6 mm × 250 mm, 5 μm). The mobile phase consisted of methanol: MTBE (methyl tert-butyl ether) in an 8:2 (V: V) ratio. An isocratic elution was performed at a flow rate of 0.8 mL/min, with an automatic loading of 20 µL of the extracted sample. The column temperature was maintained at 30 °C, and detection was done at a wavelength of 450 nm. Anthocyanin and β-carotene concentrations were quantified using external standards, with three biological replicates conducted for each compound. Total RNA from WTL and OEL were extracted using TRIzol reagent (Invitrogen, CA, USA) following the manufacturer’s instructions. The resulting RNA was reverse transcribed into cDNA and subjected to PCR cycles using adaptor primers (Supplement Table S6). PCR amplification was also employed for selective enrichment of specific fragments. Subsequently, the cDNA library was purified using the AMPure XP system (Beckman Coulter, Beverly, USA) and sequenced on an Illumina HiSeq™ 2500 platform. The expression levels of individual transcripts were determined using the transcripts per million reads (TPM) method for the identification of differentially expressed genes (DEGs). Gene abundance was quantified using RSEM (v1.1.12). Differential expression analysis was conducted using DESeq2, with significance set at the Q value less than 0.05. Gene functions were annotated using the GO and KEGG databases. For the validation of RNA-seq results, ten DEGs from leaves and tuberous roots were randomly selected for qRT-PCR analysis. The primer sequences for qRT-PCR are provided in Supplement Table S5. Total RNA extraction and cDNA synthesis followed the methods described earlier. qRT-PCR was conducted using a Light Cycler® 96 Instrument (Roche, Shanghai, China), with actin serving as the internal reference. Each gene was analyzed with three biological replicates and three technical replicates. Data regarding pigment concentrations and the relative expression levels of specific genes were subjected to statistical analysis using SPSS 21.0 software. Results are presented as mean ± SD, and statistical significance was determined with a threshold of P < 0.05.Materials and methods
Plant materials and growth conditions
Transmission electron microscopy
Determination of chlorophyll content
Determination of anthocyanin and β-carotene of cassava leaves and tuberous roots by HPLC
cDNA library construction and Illumina sequencing
Differential expression analysis and functional enrichment
RNA-seq results verification by quantitative real-time PCR (qRT-PCR)
Statistical analysis
Data availability
The single cell transcriptome dataset of the Cassava leaves that was used in the article is available at the Genome Sequence Archive (GSA) database of National Genomics Data Center (NGDC) (https://ngdc.cncb.ac.cn/). The accession number for the dataset are CRA013895, CRA013896, CRA013897, CRA013898, CRA013899 and CRA013900.
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Funding
This research was supported by the National Natural Science Foundation of China (No. 31960039), the Natural Science Foundation of Hainan Province (No. 822RC651), the Innovative research projects for postgraduates in Hainan Province (No. Hyb2020-27), the One Health Cooperative Innovation Center of Hainan University (No. XTCX2022JKB07), the Natural Science Foundation of Hainan Province (No. 821RC1053), the National Natural Science Foundation of China (No. 32160214).
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The ideas and overall study design were developed by Yi Min and Jianchun Guo. Individual experiments were designed by Yuwei Zang and Kunlin Wu. Liangwang Liu, Fangfang Ran, Changyi Wang, and Shuwen Wu performed the experiments. The performance was evaluated by Yi Min and Dayong Wang. The article was written by Yuwei Zang and revised by Jianchun Guo. All authors have presented feedback on the drafts and given final approval for publication.
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Supplementary Material 1:
Supplemental Table S1. Overview of quality control for sequencing data.
Supplemental Table S2. Reference genome comparison.
Supplemental Table S3. Differentially expressed genes in the chlorophylls, carotenoids and anthocyanins biosynthesis pathway.
Supplemental Table S4. Differentially expressed genes in the hormone signaling pathway.
Supplemental Table S5. Quantitative Real-Time PCR (qRT-PCR) primer sequences.
Supplemental Table S6. Gene specific primers sequences
Supplementary Material 2:
Supplemental Figure S1. RT-PCR analysis of MeFtsZ2-1 expression in OE plants using specific primers for the MeFtsZ2-1 gene.
Supplemental Figure S2. Leaf phenotype and tuberous root tuber phenotype.
Supplemental Figure S3. The KEGG enrichment analysis of the differentially expressed genes and transcription factor families between OE and WT.
Supplemental Figure S4. Changes in genes involved in the plant hormone signal transduction pathway in cassava leaves
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Zang, Y., Wu, K., Liu, L. et al. Transcriptomic study of the role of MeFtsZ2-1 in pigment accumulation in cassava leaves. BMC Genomics 25, 448 (2024). https://doi.org/10.1186/s12864-024-10165-w
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DOI: https://doi.org/10.1186/s12864-024-10165-w