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Physiological and omics analysis of maize inbred lines during late grain development
Jin Xining,Zhai Huijie,Wang Pingxi,Zhang Xiaoxiang,Wu Xiangyuan,Zhang Huaisheng,Chen Shilin,Huang Zhongwen 한국유전학회 2022 Genes & Genomics Vol.44 No.8
Background: There were significant differences in the change of moisture content and grain composition at the late stage of grain development among different maize varieties, but the regulation mechanism is not clear. Objective: To explore the key genes causing the variation in physiological traits of two typical maize inbred lines in late grain development. Methods: The grains at different development stages were selected as materials to determine the content of water, sucrose, starch and ABA. Transcriptomic and proteomic analysis of the materials were performed to screen relevant genes. Results: The grain dehydration rate and the content of sucrose, starch and ABA were showed significant differences between two varieties in the late stage of grain development. The enrichment analysis of common differentially expressed genes (proteins) showed that most of the genes (proteins) were enriched in the extracellular region. The downregulated genes were mainly concentrated in carbohydrate metabolism and lipid metabolism, while the upregulated genes were mainly in response to stress. Furthermore, this study also identified many key candidate genes (dehydrin genes, pathogenesis-related genes, sucrose synthase and secondary metabolites related genes) related to late grain development of maize. Conclusions: The suggested genes related to late grain development of maize can be candidates for further functional study.
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