Cup-shaped Cotyledon1 (CUC1) and CU2 regulate cytokinin homeostasis to determine ovule number in arabidopsis

M. Cucinotta, S. Manrique, C. Cuesta, E. Benková, O. Novák, L. Colombo, Journal of Experimental Botany 69 (2018) 5169–5176.

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Abstract
Seeds derive from ovules upon fertilization and therefore the total number of ovules determines the final seed yield, a fundamental trait in crop plants. Among the factors that co-ordinate the process of ovule formation, the transcription factors CUP-SHAPED COTYLEDON 1 (CUC1) and CUC2 and the hormone cytokinin (CK) have a particularly prominent role. Indeed, the absence of both CUC1 and CUC2 causes a severe reduction in ovule number, a phenotype that can be rescued by CK treatment. In this study, we combined CK quantification with an integrative genome-wide target identification approach to select Arabidopsis genes regulated by CUCs that are also involved in CK metabolism. We focused our attention on the functional characterization of UDP-GLUCOSYL TRANSFERASE 85A3 (UGT85A3) and UGT73C1, which are up-regulated in the absence of CUC1 and CUC2 and encode enzymes able to catalyse CK inactivation by O-glucosylation. Our results demonstrate a role for these UGTs as a link between CUCs and CK homeostasis, and highlight the importance of CUCs and CKs in the determination of seed yield.
Publishing Year
Date Published
2018-07-26
Journal Title
Journal of Experimental Botany
Acknowledgement
This work was funded by the Ministry of Education, Youth and Sports of the Czech Republic through the National Program of Sustainability (grant no. LO1204).
Volume
69
Issue
21
Page
5169 - 5176
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Cucinotta M, Manrique S, Cuesta C, Benková E, Novák O, Colombo L. Cup-shaped Cotyledon1 (CUC1) and CU2 regulate cytokinin homeostasis to determine ovule number in arabidopsis. Journal of Experimental Botany. 2018;69(21):5169-5176. doi:10.1093/jxb/ery281
Cucinotta, M., Manrique, S., Cuesta, C., Benková, E., Novák, O., & Colombo, L. (2018). Cup-shaped Cotyledon1 (CUC1) and CU2 regulate cytokinin homeostasis to determine ovule number in arabidopsis. Journal of Experimental Botany, 69(21), 5169–5176. https://doi.org/10.1093/jxb/ery281
Cucinotta, Mara, Silvia Manrique, Candela Cuesta, Eva Benková, Ondřej Novák, and Lucia Colombo. “Cup-Shaped Cotyledon1 (CUC1) and CU2 Regulate Cytokinin Homeostasis to Determine Ovule Number in Arabidopsis.” Journal of Experimental Botany 69, no. 21 (2018): 5169–76. https://doi.org/10.1093/jxb/ery281.
M. Cucinotta, S. Manrique, C. Cuesta, E. Benková, O. Novák, and L. Colombo, “Cup-shaped Cotyledon1 (CUC1) and CU2 regulate cytokinin homeostasis to determine ovule number in arabidopsis,” Journal of Experimental Botany, vol. 69, no. 21, pp. 5169–5176, 2018.
Cucinotta M, Manrique S, Cuesta C, Benková E, Novák O, Colombo L. 2018. Cup-shaped Cotyledon1 (CUC1) and CU2 regulate cytokinin homeostasis to determine ovule number in arabidopsis. Journal of Experimental Botany. 69(21), 5169–5176.
Cucinotta, Mara, et al. “Cup-Shaped Cotyledon1 (CUC1) and CU2 Regulate Cytokinin Homeostasis to Determine Ovule Number in Arabidopsis.” Journal of Experimental Botany, vol. 69, no. 21, Oxford University Press, 2018, pp. 5169–76, doi:10.1093/jxb/ery281.
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