Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation
IntroductionAnthocyanins are major pigments in the peels of red-series wax apple fruits, and two principal components of them, namely, the cyanin and the peonidin, are non-methoxylated and methoxylated anthocyanins, respectively. Anthocyanin O-methyltransferases (AOMTs) are an important group of enz...
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Frontiers Media S.A.
2023-09-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2023.1213642/full |
| _version_ | 1797673018262028288 |
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| author | Xiuqing Wei Xiuqing Wei Liang Li Ling Xu Lihui Zeng Jiahui Xu |
| author_facet | Xiuqing Wei Xiuqing Wei Liang Li Ling Xu Lihui Zeng Jiahui Xu |
| author_sort | Xiuqing Wei |
| collection | DOAJ |
| description | IntroductionAnthocyanins are major pigments in the peels of red-series wax apple fruits, and two principal components of them, namely, the cyanin and the peonidin, are non-methoxylated and methoxylated anthocyanins, respectively. Anthocyanin O-methyltransferases (AOMTs) are an important group of enzymes that have the ability to catalyze anthocyanins methylation to promote the solubility, stability, and bioactivity of anthocyanins. Although AOMT genes have been studied in a variety of plants, the function of them in wax apple is generally not well understood.MethodsThe anthocyanin composition in peels of two wax apple cultivars was determined by High Performance Liquid Chromatography Tandem Mass Spectrometry (HPLS-MS). The genome-wide analysis of the AOMT genes was performed with bioinformatics technology, and the expression patterns of different plant tissues, cultivars, fruit ripening stages, and exogenous abscisic acid (ABA) treatments were analyzed by transcriptome sequencing analysis and real-time quantitative PCR verification. An initial functional evaluation was carried out in vitro using recombinant the Anthocyanin O-methyltransferase Gene 5 of S. samarangense (SsAOMT5) protein.ResultsOnly two main compositions of anthocyanin were found in peels of two wax apple cultivars, and it was worth noting that Tub Ting Jiang cultivar contained non-methoxylated anthocyanin (Cy3G) only, whereas Daye cultivar contained both non-methoxylated and methoxylated (Pn3G) anthocyanins. A total of six SsAOMT genes were identified in the whole genome of wax apple, randomly distributing on three chromosomes. A phylogenic analysis of the protein sequences divided the SsAOMT gene family into three subgroups, and all SsAOMTs had highly conserved domains of AOMT family. In total, four types of stress- related and five types of hormone- related cis-elements were discovered in the promoter region of the SsAOMTs. Expression pattern analysis showed that SsAOMT5 and SsAOMT6 were expressed in all tissues to varying degrees; notably, the expression of SsAOMT5 was high in the flower and fruit and significantly higher in Daye peels than those of other cultivars in the fruit ripening period. Exogenous ABA treatment significantly increased anthocyanin accumulation, but the increase of methoxylated anthocyanin content did not reach significant level compared with those without ABA treatment, whereas the expression of SsAOMT5 upregulated under ABA treatment. We identified two homologous SsAOMT5 genes from Daye cultivar (DSsAOMT5) and Tub Ting Jiang cultivar (TSsAOMT5); the results of functional analyses to two SsAOMT5 recombinant proteins in vitro demonstrated that DSsAOMT5 showed methylation modification activity, but TSsAOMT5 did not.ConclusionIn conclusion, SsAOMT5 was responsible for methylated anthocyanin accumulation in the peels of wax apple and played an important role in red coloration in wax apple peels. |
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| spelling | doaj.art-cfdf25fda69043558c10f51adf37fda52023-09-26T14:05:24ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2023-09-011410.3389/fpls.2023.12136421213642Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylationXiuqing Wei0Xiuqing Wei1Liang Li2Ling Xu3Lihui Zeng4Jiahui Xu5College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, ChinaFruit Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, ChinaFruit Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, ChinaFruit Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, ChinaCollege of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, ChinaFruit Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, ChinaIntroductionAnthocyanins are major pigments in the peels of red-series wax apple fruits, and two principal components of them, namely, the cyanin and the peonidin, are non-methoxylated and methoxylated anthocyanins, respectively. Anthocyanin O-methyltransferases (AOMTs) are an important group of enzymes that have the ability to catalyze anthocyanins methylation to promote the solubility, stability, and bioactivity of anthocyanins. Although AOMT genes have been studied in a variety of plants, the function of them in wax apple is generally not well understood.MethodsThe anthocyanin composition in peels of two wax apple cultivars was determined by High Performance Liquid Chromatography Tandem Mass Spectrometry (HPLS-MS). The genome-wide analysis of the AOMT genes was performed with bioinformatics technology, and the expression patterns of different plant tissues, cultivars, fruit ripening stages, and exogenous abscisic acid (ABA) treatments were analyzed by transcriptome sequencing analysis and real-time quantitative PCR verification. An initial functional evaluation was carried out in vitro using recombinant the Anthocyanin O-methyltransferase Gene 5 of S. samarangense (SsAOMT5) protein.ResultsOnly two main compositions of anthocyanin were found in peels of two wax apple cultivars, and it was worth noting that Tub Ting Jiang cultivar contained non-methoxylated anthocyanin (Cy3G) only, whereas Daye cultivar contained both non-methoxylated and methoxylated (Pn3G) anthocyanins. A total of six SsAOMT genes were identified in the whole genome of wax apple, randomly distributing on three chromosomes. A phylogenic analysis of the protein sequences divided the SsAOMT gene family into three subgroups, and all SsAOMTs had highly conserved domains of AOMT family. In total, four types of stress- related and five types of hormone- related cis-elements were discovered in the promoter region of the SsAOMTs. Expression pattern analysis showed that SsAOMT5 and SsAOMT6 were expressed in all tissues to varying degrees; notably, the expression of SsAOMT5 was high in the flower and fruit and significantly higher in Daye peels than those of other cultivars in the fruit ripening period. Exogenous ABA treatment significantly increased anthocyanin accumulation, but the increase of methoxylated anthocyanin content did not reach significant level compared with those without ABA treatment, whereas the expression of SsAOMT5 upregulated under ABA treatment. We identified two homologous SsAOMT5 genes from Daye cultivar (DSsAOMT5) and Tub Ting Jiang cultivar (TSsAOMT5); the results of functional analyses to two SsAOMT5 recombinant proteins in vitro demonstrated that DSsAOMT5 showed methylation modification activity, but TSsAOMT5 did not.ConclusionIn conclusion, SsAOMT5 was responsible for methylated anthocyanin accumulation in the peels of wax apple and played an important role in red coloration in wax apple peels.https://www.frontiersin.org/articles/10.3389/fpls.2023.1213642/fullAOMT gene familymethylationwax applegene expressionanthocyanin |
| spellingShingle | Xiuqing Wei Xiuqing Wei Liang Li Ling Xu Lihui Zeng Jiahui Xu Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation Frontiers in Plant Science AOMT gene family methylation wax apple gene expression anthocyanin |
| title | Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation |
| title_full | Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation |
| title_fullStr | Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation |
| title_full_unstemmed | Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation |
| title_short | Genome-wide identification of the AOMT gene family in wax apple and functional characterization of SsAOMTs to anthocyanin methylation |
| title_sort | genome wide identification of the aomt gene family in wax apple and functional characterization of ssaomts to anthocyanin methylation |
| topic | AOMT gene family methylation wax apple gene expression anthocyanin |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2023.1213642/full |
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