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Frontiers of Agricultural Science and Engineering

ISSN 2095-7505

ISSN 2095-977X(Online)

CN 10-1204/S

Postal Subscription Code 80-906

Front. Agr. Sci. Eng.    2021, Vol. 8 Issue (4) : 645-658    https://doi.org/10.15302/J-FASE-2020350
RESEARCH ARTICLE
SUPEROXIDE DISMUTASE FAMILY GENES IN WATERMELON AND THEIR RESPONSES TO DIFFERENT ABIOTIC STRESSES
Yong ZHOU, Linjuan OUYANG, Dahu ZHOU, Yicong CAI, Haohua HE()
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding (Ministry of Education), Jiangxi Agricultural University, Nanchang 330045, China.
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Abstract

• A total of 8 SOD genes from watermelon were identified and bioinformatically analyzed.

• The SOD proteins from watermelon and other different plant species can be classified into five groups consistent with their metal cofactors.

ClSOD genes exhibited distinctive tissue-specific and abiotic stress responsive expression patterns.

Superoxide dismutase (SOD) is an important enzyme in the antioxidant system of plants and plays a vital role in stress responses by maintaining the dynamic balance of reactive oxygen species (ROS) concentrations. Genome-wide analysis of the SOD gene family in various plant species has been conducted but little is known about this gene family in watermelon (Citrullus lanatus). Here, eight SOD genes were identified in the watermelon genome and are designated ClCSD1-5, ClFSD1-2 and ClMSD according to their metal cofactors. Phylogenetic analysis shows that SOD proteins from various plant species can be classified into five groups and members in the same group possess the same metal cofactor and similar subcellular localizations. Expression analysis of the ClSOD genes indicates that they had tissue-specific expression patterns with high expression in different tissues including the leaves, flowers and fruit. In addition, the expression of ClSOD genes differed appreciably under salinity, drought and abscisic acid (ABA) treatments, indicating that they may be involved in ROS scavenging under different abiotic stresses via an ABA-dependent signaling pathway. These results lay the foundation for elucidating the function of ClSOD genes in stress tolerance and fruit development in watermelon.

Keywords abiotic stress      expression analysis      phylogeny      SOD      superoxide dismutase      watermelon     
Corresponding Author(s): Haohua HE   
Just Accepted Date: 28 June 2020   Online First Date: 02 December 2020    Issue Date: 19 November 2021
 Cite this article:   
Yong ZHOU,Linjuan OUYANG,Dahu ZHOU, et al. SUPEROXIDE DISMUTASE FAMILY GENES IN WATERMELON AND THEIR RESPONSES TO DIFFERENT ABIOTIC STRESSES[J]. Front. Agr. Sci. Eng. , 2021, 8(4): 645-658.
 URL:  
https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2020350
https://academic.hep.com.cn/fase/EN/Y2021/V8/I4/645
Gene Gene ID Map position/bp CDS length/bp Protein length (aa) MW/kDa pI Subcellular location
ClCSD1 Cla019840 Chr2:26640708-26642932 459 152 15.44 5.44 Cytoplasm
ClCSD2 Cla008698 Chr2:31797559-31799755 654 217 22.11 6.27 Cytoplasm
ClCSD3 Cla011299 Chr3:27370429-27372442 459 152 15.12 5.99 Cytoplasm
ClCSD4 Cla012125 Chr4:15855163-15857016 450 149 14.97 7.30 Chloroplast
ClCSD5 Cla001158 Chr10:3928563-3929302 411 136 14.27 4.49 Cytoplasm
ClFSD1 Cla011317 Chr3:27587644-27592715 804 267 30.92 8.09 Chloroplast
ClFSD2 Cla010691 Chr7:28869168-28873752 888 295 33.49 7.04 Chloroplast
ClMSD Cla008101 Chr3:141384-143031 708 235 26.13 8.72 Mitochondrion
Tab.1  Features of SOD family genes identified in watermelon
Fig.1  Phylogenetic analysis of SOD proteins in watermelon and other plant species. The phylogenetic tree was constructed using Clustal Omega and MEGA 7.0 by the neighbor-joining method with 1000 bootstrap repeats. The protein sequences used for creation of the phylogenetic tree are listed in Table S2. Cl, Citrullus lanatus; At, Arabidopsis thaliana; Sl, Solanum lycopersicum; Cs, Cucumis sativus; Mt, Medicago truncatula; Sb, Sorghum bicolor; Bd, Brachypodium distachyon.
Fig.2  (a) Phylogenetic relationships, (b) structures and (c) conserved motifs of watermelon SOD proteins. Multiple alignments were conducted with Clustal Omega using full-length watermelon SOD protein sequences, and the phylogenetic tree was created with MEGA 7.0 using the NJ method with bootstrap tests repeated 1000 times. The colored boxes indicate different conserved motifs, and their positions in each watermelon SOD protein sequence are displayed proportionally.
Fig.3  Multiple sequence alignment of ClSOD protein sequences. Two conserved Cu/ZnSOD signatures (GFH[VLI]H[AES][LY]GDTT and GNAG[EGA]R[ILV][CAG]CG) are indicated with the red box. The metal binding sites of Cu/ZnSODs for Cu2+ and Zn2+ are indicated with red arrows. The conserved FeSOD signature (AQ[VI]WNHDF[FL]WES) and metal binding domain (D[MV]WEHAYY) are boxed with blue and brown, respectively. Two conserved His residues in FeSODs are indicated with blue, while six conserved residues (His, Phe, Gln and Asp) are indicated with blue boxes.
Fig.4  Exon-intron structure of watermelon SOD genes based on the phylogenetic relationship. Exons and introns are indicated by blue boxes and black lines, respectively, and their lengths in each gene are displayed proportionally.
Fig.5  Chromosomal locations of the watermelon SOD genes. Segmentally duplicated SOD genes are indicated in red.
Fig.6  Distribution of stress- and hormone-responsive elements in 1-kb promoter regions of ClSOD genes. LTR, low temperature-responsive element; MBS, MYB binding site involved in drought-inducibility; W-box, WRKY binding site involved in abiotic stress and defense response; ARE, cis-element essential for the anaerobic induction; WUN-motif, wound-responsive element; TC-rich repeats, cis-element involved in defense and stress responsiveness; ABRE, ABA-responsive element; ERE, ethylene-responsive element; CGTCA-motif, MeJA-responsive element; TCA-element, salicylic acid-responsive element; TGA-element, auxin-responsive element; P-box and TATC-box, gibberellin-responsive element.
Fig.7  Expression patterns of selected ClSOD genes (a) in watermelon tissues and (b) during fruit development. L, leaves; R, roots; S, stems; Fr, fruits; F, flowers; FF and FR are fruit flesh and fruit rind at 10, 18, 26, and 34 days after pollination, respectively. For transcriptome analysis the gene expression levels were calculated with the logarithmic method involving log2(RPKM+ 1).
Fig.8  Expression pattern analysis of ClSOD genes in response to salinity stress. Mean values with the same letters above the bars are not significantly different (Tukey’s multiple range tests, P<0.05) for different treatment elapsed times.
Fig.9  Expression patterns of ClSOD genes under drought treatment determined by qRT-PCR. Mean values with the same letter above the bars are not significantly different (Tukey’s multiple range tests, P<0.05) between different treatment elapsed times.
Fig.10  Expression pattern analysis of ClSOD genes in response to ABA treatment. Different mean values with the same letter above the bars are not significantly different (Tukey’s multiple range tests, P<0.05) between different treatment elapsed times.
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