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• W2804983295 abstract "Plants face temporal and spatial variation in nitrogen (N) availability. This includes heterogeneity in soil nitrate (NO3-) content. To overcome these constraints, plants modify their gene expression and physiological processes to optimize N acquisition. This plasticity relies on a complex long-distance root-shoot-root signaling network that remains poorly understood. We previously showed that cytokinin (CK) biosynthesis is required to trigger systemic N signaling. Here, we performed split-root experiments and used a combination of CK-related mutant analyses, hormone profiling, transcriptomic analysis, NO3- uptake assays, and root growth measurements to gain insight into systemic N signaling in Arabidopsis thaliana By comparing wild-type plants and mutants affected in CK biosynthesis and ABCG14-dependent root-to-shoot translocation of CK, we revealed an important role for active trans-zeatin (tZ) in systemic N signaling. Both rapid sentinel gene regulation and long-term functional acclimation to heterogeneous NO3- supply, including NO3- transport and root growth regulation, are likely mediated by the integration of tZ content in shoots. Furthermore, shoot transcriptome profiling revealed that glutamate/glutamine metabolism is likely a target of tZ root-to-shoot translocation, prompting an interesting hypothesis regarding shoot-to-root communication. Finally, this study highlights tZ-independent pathways regulating gene expression in shoots as well as NO3- uptake activity in response to total N deprivation." @default.
• W2804983295 created "2018-06-01" @default.
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• W2804983295 date "2018-05-15" @default.
• W2804983295 modified "2023-10-17" @default.
• W2804983295 title "Responses to Systemic Nitrogen Signaling in Arabidopsis Roots Involve <i>trans</i>-Zeatin in Shoots" @default.
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• W2804983295 doi "https://doi.org/10.1105/tpc.18.00011" @default.
• W2804983295 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6048791" @default.
• W2804983295 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29764985" @default.
• W2804983295 hasPublicationYear "2018" @default.
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