A functional kinase is necessary for cyclin-dependent kinase G1 (CDKG1) to maintain fertility at high ambient temperature in Arabidopsis

C. Nibau, D. Dadarou, N. Kargios, A. Mallioura, N. Fernandez-Fuentes, N. Cavallari, J.H. Doonan, Frontiers in Plant Science 11 (2020).

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Author
Nibau, Candida; Dadarou, Despoina; Kargios, Nestoras; Mallioura, Areti; Fernandez-Fuentes, Narcis; Cavallari, NicolaIST Austria; Doonan, John H.
Department
Abstract
Maintaining fertility in a fluctuating environment is key to the reproductive success of flowering plants. Meiosis and pollen formation are particularly sensitive to changes in growing conditions, especially temperature. We have previously identified cyclin-dependent kinase G1 (CDKG1) as a master regulator of temperature-dependent meiosis and this may involve the regulation of alternative splicing (AS), including of its own transcript. CDKG1 mRNA can undergo several AS events, potentially producing two protein variants: CDKG1L and CDKG1S, differing in their N-terminal domain which may be involved in co-factor interaction. In leaves, both isoforms have distinct temperature-dependent functions on target mRNA processing, but their role in pollen development is unknown. In the present study, we characterize the role of CDKG1L and CDKG1S in maintaining Arabidopsis fertility. We show that the long (L) form is necessary and sufficient to rescue the fertility defects of the cdkg1-1 mutant, while the short (S) form is unable to rescue fertility. On the other hand, an extra copy of CDKG1L reduces fertility. In addition, mutation of the ATP binding pocket of the kinase indicates that kinase activity is necessary for the function of CDKG1. Kinase mutants of CDKG1L and CDKG1S correctly localize to the cell nucleus and nucleus and cytoplasm, respectively, but are unable to rescue either the fertility or the splicing defects of the cdkg1-1 mutant. Furthermore, we show that there is partial functional overlap between CDKG1 and its paralog CDKG2 that could in part be explained by overlapping gene expression.
Publishing Year
Date Published
2020-11-10
Journal Title
Frontiers in Plant Science
Acknowledgement
CN, DD, NF-F, and JD were funded by the BBSRC (grant number BB/M009459/1). NK and AM were funded through the ERASMUS+Program. NC was funded by the VIPS Program of the Austrian Federal Ministry of Science and Research and the City of Vienna.
Volume
11
Article Number
586870
eISSN
IST-REx-ID

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Nibau C, Dadarou D, Kargios N, et al. A functional kinase is necessary for cyclin-dependent kinase G1 (CDKG1) to maintain fertility at high ambient temperature in Arabidopsis. Frontiers in Plant Science. 2020;11. doi:10.3389/fpls.2020.586870
Nibau, C., Dadarou, D., Kargios, N., Mallioura, A., Fernandez-Fuentes, N., Cavallari, N., & Doonan, J. H. (2020). A functional kinase is necessary for cyclin-dependent kinase G1 (CDKG1) to maintain fertility at high ambient temperature in Arabidopsis. Frontiers in Plant Science. Frontiers. https://doi.org/10.3389/fpls.2020.586870
Nibau, Candida, Despoina Dadarou, Nestoras Kargios, Areti Mallioura, Narcis Fernandez-Fuentes, Nicola Cavallari, and John H. Doonan. “A Functional Kinase Is Necessary for Cyclin-Dependent Kinase G1 (CDKG1) to Maintain Fertility at High Ambient Temperature in Arabidopsis.” Frontiers in Plant Science. Frontiers, 2020. https://doi.org/10.3389/fpls.2020.586870.
C. Nibau et al., “A functional kinase is necessary for cyclin-dependent kinase G1 (CDKG1) to maintain fertility at high ambient temperature in Arabidopsis,” Frontiers in Plant Science, vol. 11. Frontiers, 2020.
Nibau C, Dadarou D, Kargios N, Mallioura A, Fernandez-Fuentes N, Cavallari N, Doonan JH. 2020. A functional kinase is necessary for cyclin-dependent kinase G1 (CDKG1) to maintain fertility at high ambient temperature in Arabidopsis. Frontiers in Plant Science. 11, 586870.
Nibau, Candida, et al. “A Functional Kinase Is Necessary for Cyclin-Dependent Kinase G1 (CDKG1) to Maintain Fertility at High Ambient Temperature in Arabidopsis.” Frontiers in Plant Science, vol. 11, 586870, Frontiers, 2020, doi:10.3389/fpls.2020.586870.
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