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- W4386157922 abstract "Abstract Background Drought stress can substantially restrict maize growth and productivity, and global warming and an increasing frequency of extreme weather events are likely to result in more yield losses in the future. Therefore, unraveling the molecular mechanism underlying the response to drought stress is essential for breeding drought-resilient crops. Results In this study, we subjected the 3-leaf-period plants of two maize inbred lines, a drought-tolerant line (si287) and a drought-sensitive line (X178), to drought stress for seven days while growing in a chamber. Subsequently, we measured physiological traits and analyzed transcriptomic and metabolic profiles of two inbred lines. Our KEGG analysis of genes and metabolites revealed significant differences in pathways related to glycolysis/gluconeogenesis, flavonoid biosynthesis, starch and sucrose metabolism, and biosynthesis of amino acids. Our joint analysis identified proline, tryptophan and phenylalanine are crucial amino acids for maize response to drought stress. Especially, tryptophan (Trp) was found to enhance tolerance via IAA and ABA signaling and flavonoid biosynthesis. We identified three hub genes, indole-3-acetaldehyde oxidase ( ZmAO1 , 542228), catalase 1 ( ZmCAT1, 542369), and flavin-containing monooxygenase 6 ( ZmYUC6 , 103629142), that may regulate tryptophan biosynthesis and drought tolerance. Genes and metabolites related to tryptophan biosynthesis, such as L-tryptophan, indole, and shikimic acid, represent potential targets for genome editing to improve maize tolerance and yield under drought stress. Conclusions This study sheds light on the molecular mechanisms of maize seedlings in response to drought stress and identifies candidate genes and metabolites for improving drought tolerance in maize. The identification of different resistance mechanisms in maize inbred lines will facilitate the exploration of maize germplasm and the breeding of drought-resilient varieties." @default.
- W4386157922 created "2023-08-26" @default.
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- W4386157922 date "2023-08-25" @default.
- W4386157922 modified "2023-09-27" @default.
- W4386157922 title "Utilizing transcriptomics and metabolomics to unravel key genes and metabolites of maize seedlings in response to drought stress" @default.
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- W4386157922 doi "https://doi.org/10.21203/rs.3.rs-3270206/v1" @default.
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