Full-scale landscape metabolome map provides insights to convergent metabolite divergence and promotes edible maize breeding
Author:
Li Zhiyong1, Li Chunhui2, Shi Yaxing1, Dong Hui1, Xiao Senlin1, Zhang Ruyang1, Liu Hui1, Jiao Yanyan1, Su Aiguo1, Wang Xiaqing3, Zhao Yanxin2, Wang Shuai1, Xu Li1, Fan Yanli1, Luo Meijie1, Xi Shengli1, Yu Ainian1, Wang Fengge1, Ge Jianrong1, Tian Hongli1, Yi Hongmei1, Lv Yuanda4, Li Huihui5ORCID, Wang Ronghuan1, Lu Baishan1, Song Wei6, Zhao Jiuran7ORCID
Affiliation:
1. Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding, Maize Research Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097 2. Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding, Beijing Academy of Agriculture & Forestry Sciences, Beijing 100097 3. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University 4. Excellence and Innovation Center, Jiangsu Academy of Agricultural Sciences, Nanjing 5. Chinese Academy of Agricultural Sciences 6. Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding, Maize Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China. 7. Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding,Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China.
Abstract
Abstract
Ediblemaize is an important food crop, providing energy and nutrients to meet human health and nutritional requirements. However, how environmental pressures and human activity have shaped the ediblemaizemetabolome remains unclear.In this study, we collected 452 diverse edible maize accessions worldwide, comprising waxy, sweet and field maize. A total of 3020 non-redundant metabolites, including 802 annotated metabolites, were identified by a two-step optimized approach, which generated the most comprehensive annotated metabolites dataset in plants to date. Although specific metabolite divergencewas detected in Field-Sweet and Field-Waxy divergences, convergent metabolite divergencewas the dominant divergence pattern. We identified hub genes in all metabolite classes by mGWAS hotspot analysis. Seventeen and 16 hub genes were selected as the key divergence genes for flavonoids and lipids, respectively. Surprisingly, almost all of these genes were under non-parallel selection, which indicated non-parallel selection was the main genetic mechanism of convergent metabolic divergence. Furthermore, UGT1 and C1 in the flavonoid pathway, and KCS1 and LPP2 in the lipid pathway, played different roles in convergent metabolite divergence. Based on our research, we established the first edible maize metabolome database, EMMDB. We successfully applied EMMDB for precision improvement of nutritional and flavor traits, and an elite inbred line 6644_2 was bred with greatly improved in contents of flavonoids, lysophosphatidylcholines, lysophosphatidylethanolamines, and vitamins. These findings provide insights into the underlying genetic mechanisms of edible maize metabolite divergence and provide a database for the breeding improvement of edible maize flavor and nutritional traits by metabolome precision design.
Publisher
Research Square Platform LLC
Reference104 articles.
1. Evaluation of Biosynthesis, Accumulation and Antioxidant Activityof Vitamin E in Sweet Corn (Zea mays L.) during Kernel Development;Xie L;International Journal of Molecular Sciences,2017 2. The Past, Present, and Future of Maize Improvement: Domestication, Genomics, and Functional Genomic Routes toward Crop Enhancement;Liu J;Plant Communications,2020 3. Post-Domestication Selection in the Maize Starch Pathway;Fan L;PLOS ONE,2009 4. The extent of adaptive wild introgression in crops;Janzen GM;New Phytologist,2019 5. Genome assembly and population genomic analysis provide insights into the evolution of modern sweet corn;Hu Y;Nature Communications,2021
|
|