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Transcriptomic and chemical analyses to identify candidate genes involved in color variation of sainfoin flowers

文献类型： 外文期刊

作者： Qiao, Yu 1 ; Cheng, Qiming 1 ; Zhang, Yutong 1 ; Yan, Wei 1 ; Yi, Fengyan 3 ; Shi, Fengling 1 ;

作者机构： 1.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm, Key Lab Forage Cultivat Proc & High Efficient Uti, Minist Agr, Hohhot 010011, Peoples R China

2.Inner Mongolia Agr Univ, Key Lab Grassland Resources, Minist Educ, Hohhot 010011, Peoples R China

3.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot, Peoples R China

关键词： Sainfoin; Flavonoid; Anthocyanin; Transcriptome; DEGs; Flower color

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2021 年 21 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundSainfoin (Onobrychis viciifolia Scop) is not only a high-quality legume forage, but also a nectar-producing plant. Therefore, the flower color of sainfoin is an important agronomic trait, but the factors affecting its flower phenotype are still unclear. To gain insights into the regulatory networks associated with metabolic pathways of coloration compounds (flavonoids or anthocyanins) and identify the key genes, we conducted a comprehensive analysis of the phenotype, metabolome and transcriptome of WF and AF of sainfoin.ResultsDelphinidin, petunidin and malvidin derivatives were the main anthocyanin compounds in the AF of sainfoin. These substances were not detected in the WF of sainfoin. The transcriptomes of WF and AF in sainfoin at the S1 and S3 stages were obtained using the Illumina HiSeq4000 platform. Overall, 10,166 (4273 upregulated and 5893 downregulated) and 15,334 (8174 upregulated and 7160 downregulated) DEGs were identified in flowers at S1 and S3 stages, respectively (WF-VS-AF). KEGG pathway annotations showed that 6396 unigenes were annotated to 120 pathways and contained 866 DEGs at S1 stages, and 6396 unigenes were annotated to 131 pathways and included 1546 DEGs at the S3 stage. Nine DEGs belonging to the "flavonoid biosynthesis"and "phenylpropanoid biosynthesis" pathways involved in flower color formation were identified and verified by RT-qPCR analyses. Among these DEGs, 4CL3, FLS, ANS, CHS, DFR and CHI2 exhibited downregulated expression, and F3H exhibited upregulated expression in the WF compared to the AF, resulting in a decrease in anthocyanin synthesis and the formation of WF in sainfoin.ConclusionsThis study is the first to use transcriptome technology to study the mechanism of white flower formation in sainfoin. Our transcriptome data will be a great enrichment of the genetic information for sainfoin. In addition, the data presented herein will provide valuable molecular information for genetic breeding and provide insight into the future study of flower color polymorphisms in sainfoin.

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