中国农业科学 ›› 2022, Vol. 55 ›› Issue (20): 3997-4010.doi: 10.3864/j.issn.0578-1752.2022.20.011

• 园艺 • 上一篇    下一篇

转录组及代谢组联合解析茄子果色上位遗传效应

孙保娟1(),汪瑞2,孙光闻2,王益奎3,李涛1,宫超1,衡周1,游倩1,李植良1()   

  1. 1广东省农业科学院蔬菜研究所/广东省蔬菜新技术研究重点实验室,广州 510640
    2华南农业大学园艺学院,广州 510642
    3广西壮族自治区农业科学院蔬菜研究所,南宁 530027
  • 收稿日期:2022-01-20 接受日期:2022-06-06 出版日期:2022-10-16 发布日期:2022-10-24
  • 通讯作者: 李植良
  • 作者简介:孙保娟,Tel:020-38469456;E-mail: sunbaojuan@hotmail.com
  • 基金资助:
    国家自然科学基金(31501755);广东省现代农业产业技术体系(2021KJ110);广东省现代农业产业技术体系(2021KJ106);广东省自然科学基金(2021A1515012490);广东省农业科学院农业优势产业学科团队建设项目(202114TD);广东省农业科学院农业优势产业学科团队建设项目(R2020PY-JX003)

Transcriptome and Metabolome Integrated Analysis of Epistatic Genetics Effects on Eggplant Peel Color

SUN BaoJuan1(),WANG Rui2,SUN GuangWen2,WANG YiKui3,LI Tao1,GONG Chao1,HENG Zhou1,YOU Qian1,LI ZhiLiang1()   

  1. 1Vegetable Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory for New Technology Research of Vegetables, Guangzhou 510640
    2College of Horticulture, South China Agricultural University, Guangzhou 510642
    3Institute of Vegetable, Guangxi Academy of Agricultural Sciences, Nanning 530007
  • Received:2022-01-20 Accepted:2022-06-06 Online:2022-10-16 Published:2022-10-24
  • Contact: ZhiLiang LI

摘要:

【目的】 茄子果色与商品果外观品质和价值密切相关,花青素是决定茄子果色的重要天然色素之一。通过基因表达和代谢物差异比较,解析上位基因互作调控茄子果皮花青素合成的作用机制,为不同果色茄子选育提供理论基础。【方法】 以花青素合成结构基因ANS突变的白果色母本19141、花青素合成关键调控基因MYB1突变的白果色父本19147及其紫红果色F1代E3316茄子为试验材料,对商品果期果皮进行转录组测序和广靶代谢组分析。【结果】 转录组测序分析表明,19141_vs_19147的差异表达基因(DEGs)最多,其次是E3316_vs_19141,两个比较组DEGs均在类黄酮途径富集程度最高;E3316_vs_19147筛选到的DEGs最少,未在类黄酮途径富集。广靶代谢组共检测分析到218个代谢物。E3316_vs_19141共检测到差异代谢物(DAMs)113个,E3316_vs_19147共检测到差异代谢物98个。转录组和代谢组联合分析发现花青素生物合成关键结构基因CHS、CHI、F3H、DFRANS,关键调节基因MYB1AN1AN11,修饰基因3GT5GTATOMT,还有转运基因AN9GST)相对表达量均为19141>E3316>19147;果皮呈色相关的花青素类代谢物矢车菊素(CAS:528-58-5)、矢车菊素3,5-二葡萄糖苷(CAS:20905-74-2)含量为E3316>19147>19141。上位基因调控下,茄子果皮中同时表达F3′HF3′5′H,但是F3′H表达水平远高于F3′5′H。E3316花青素含量高于亲本,绿原酸含量低于其亲本。【结论】 上位性基因互作控制果色的遗传背景下,亲本突变基因类型决定了花青素代谢通路基因表达趋势和果皮呈色抑制方式。两个白果色亲本杂交F1代果皮呈紫红色是由于花青素生物合成途径两个互作突变基因位点功能互补;F3′H高水平表达是合成矢车菊型花青素的主要原因;果皮花青素和绿原酸生物合成间存在竞争关系。

关键词: 茄子, 果色, 上位基因, 花青素, 转录组, 代谢组

Abstract:

【Objective】Peel color is closely related to the appearance and value of eggplant. Anthocyanin is one of the natural pigments that determines an eggplant’s peel color. Through the comparison of gene expression and metabolites as well as the analysis on the mechanism of epistatic gene interaction and regulation of anthocyanin synthesis in eggplant peel, this paper provided a theoretical basis for eggplant breeding with different peel colors.【Method】The white-peel female parent 19141 with mutation at the structural gene ANS of anthocyanin biosynthesis pathway, white-peel male parent 19147 with mutation at regulatory gene MYB1 of anthocyanin biosynthesis pathway, and their F1 hybrid E3316 with reddish-purple-peel were used as test materials, while transcriptome sequencing and wide-targeted metabolome analysis were performed on peels of commercial eggplant.【Result】The transcriptome sequencing analysis showed that: 19141_vs_19147 had the most differentially expressed genes (DEGs), followed by E3316_vs_19141. The two comparison groups both had the significant enrichment of DEGs in the flavonoid pathway. The DEGs of E3316_vs_19147 were the least and were not enriched in the flavonoid pathway. A total of 218 metabolites were detected by wide-targeted metabolome analysis. A total of 113 differential accumulated metabolites (DAMs) were detected in E3316_vs_19141, and total 98 DAMs were detected in E3316_vs_19147. The combined analysis of transcriptome and metabolome found that the relative expression levels of key structural genes CHS, CHI, F3H, DFR and ANS, key regulatory genes MYB1, AN1 and AN11, modifier genes 3GT, 5GT, AT and OMT, and transporter gene AN9 (GST) involving anthocyanin biosynthesis pathway had the relation of 19141>E3316>19147. The contents of anthocyanin metabolite cyanidin (CAS: 528-58-5) and cyanin (CAS: 20905-74-2) related to peel coloration had the relation of E3316>19147>19141. The combined analysis of transcriptome and metabolome both showed that the difference of E3316_vs_19141 was bigger than E3316_vs_19147. Under the regulation of epistatic genes, F3'H and F3'5'H genes were expressed simultaneously in eggplant peel, but the expression level of F3'H was much higher than that of F3'5'H. The anthocyanin content of E3316 was higher than that of its parents, while the chlorogenic acid content was lower than that of its parents. 【Conclusion】Under the interaction of epistatic genes with controlling the peel color, the locus (type) and mutation mode of mutant gene in parent determined the trend of gene expression in the whole anthocyanin metabolism pathway and the inhibition mode of peel pigmentation. The reddish-purple-peel F1 hybrid of two white-peel parents was the result of the function complementation of two mutated gene involved in anthocyanin biosynthesis pathway. The highly expressed F3'H was the main cause for synthesis of cyanidin, and the relationship between anthocyanin and chlorogenic acid biosynthesis was competitive in peels.

Key words: eggplant, peel color, epistatic genes, anthocyanins, transcriptome, metabolome