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1.
Methods Enzymol ; 671: 127-151, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35878975

RESUMO

Advances in analytical methodologies, including those coupled with mass spectrometry (gas chromatography and liquid chromatography; GC-MS and LC-MS) have facilitated profiling of carotenoids in complex plant extracts. The combination of metabolomic data together with diverse germplasm resources provides a means to discover the underlying genetic factors responsible for modulating the carotenoid biosynthetic pathway. Here we summarize metabolomics methodologies for large-scale metabolite analysis and provide guidelines for genetic analysis to leverage natural variation for identification of genes encoding biosynthetic pathway enzymes based on linkage mapping and/or genome-wide association studies (GWAS). We also demonstrate the workflow for identifying genes in carotenoid biosynthesis based on natural variation using case studies in several species.


Assuntos
Vias Biossintéticas , Estudo de Associação Genômica Ampla , Vias Biossintéticas/genética , Carotenoides/metabolismo , Cromatografia Gasosa-Espectrometria de Massas/métodos , Variação Genética , Metabolômica/métodos
2.
Nat Commun ; 11(1): 3719, 2020 07 24.
Artigo em Inglês | MEDLINE | ID: mdl-32709943

RESUMO

Wild teas are valuable genetic resources for studying domestication and breeding. Here we report the assembly of a high-quality chromosome-scale reference genome for an ancient tea tree. The further RNA sequencing of 217 diverse tea accessions clarifies the pedigree of tea cultivars and reveals key contributors in the breeding of Chinese tea. Candidate genes associated with flavonoid biosynthesis are identified by genome-wide association study. Specifically, diverse allelic function of CsANR, CsF3'5'H and CsMYB5 is verified by transient overexpression and enzymatic assays, providing comprehensive insights into the biosynthesis of catechins, the most important bioactive compounds in tea plants. The inconspicuous differentiation between ancient trees and cultivars at both genetic and metabolic levels implies that tea may not have undergone long-term artificial directional selection in terms of flavor-related metabolites. These genomic resources provide evolutionary insight into tea plants and lay the foundation for better understanding the biosynthesis of beneficial natural compounds.


Assuntos
Variação Genética , Genoma de Planta , Melaleuca/genética , Linhagem , Árvores/genética , Alelos , Vias Biossintéticas/genética , Camellia sinensis/genética , Catequina/metabolismo , China , Domesticação , Evolução Molecular , Ácido Gálico/metabolismo , Regulação da Expressão Gênica de Plantas , Genes de Plantas/genética , Estudo de Associação Genômica Ampla , Genômica , Análise de Sequência de RNA , Óleo de Melaleuca
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