Abstract
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Cytokinin membrane receptors of the Arabidopsis thaliana AHK2 and AHK3 play opposite roles in the expression of plastid genes and genes for the plastid transcriptional machinery during leaf senescence
Abstract
Loss-of-function mutants of Arabidopsis thaliana were used to study the role of cytokinin receptors in the expression of chloroplast genes during leaf senescence. Accumulation of transcripts of several plastid-encoded genes is dependent on the АНК2/АНК3 receptor combination. АНК2 is particularly important at the final stage of plant development and, unlike АНК3, a positive regulator of leaf senescence. Cytokinin-dependent up-regulation of the nuclear encoded genes for chloroplast RNA polymerases RPOTp and RPOTmp suggests that the hormone controls plastid gene expression, at least in part, via the expression of nuclear genes for the plastid transcription machinery. This is further supported by cytokinin dependent regulation of genes for the nuclear encoded plastid σ-factors, SIG1-6, which code for components of the transcriptional apparatus in chloroplasts.
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Acknowledgements
This work was supported by the grant from the Russian Science Foundation (No. 14-14-00584). We thank Dr. Tatsuo Kakimoto from Osaka University, Japan for cre1-12, ahk2-2, ahk3-3, ahk2-2 ahk3-3, ahk2-2 cre1-12, ahk3-3 cre1-12 mutants.
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MND designed and conducted the experiments, analyzed the data, and accomplished pictures for the manuscript. ACD, DAZ, ZFR performed the experiments and analyzed the data. NVK contributed in design of the experiments, analyzed the data and wrote the manuscript. RO analyzed the data, and finalized the manuscript. VVK conceived and designed the experiments, analyzed the data, and finalized the manuscript. All authors read and approved the final manuscript.
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Danilova, M.N., Kudryakova, N.V., Doroshenko, A.S. et al. Opposite roles of the Arabidopsis cytokinin receptors AHK2 and AHK3 in the expression of plastid genes and genes for the plastid transcriptional machinery during senescence. Plant Mol Biol 93, 533–546 (2017). https://doi.org/10.1007/s11103-016-0580-6
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DOI: https://doi.org/10.1007/s11103-016-0580-6