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Article

Characterization of the FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 Homolog SlFKF1 in Tomato as a Model for Plants with Fleshy Fruit

1
Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan
2
Graduate School of Agricultural Science, Tohoku University, Aoba-ku, Sendai 980-8572, Japan
*
Authors to whom correspondence should be addressed.
Academic Editors: Jen-Tsyng Chen, Parviz Heidari and Sixue Chen
Int. J. Mol. Sci. 2021, 22(4), 1735; https://doi.org/10.3390/ijms22041735
Received: 11 December 2020 / Revised: 25 January 2021 / Accepted: 4 February 2021 / Published: 9 February 2021
(This article belongs to the Special Issue Cell Signaling in Model Plants 2.0)
FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 (FKF1) is a blue-light receptor whose function is related to flowering promotion under long-day conditions in Arabidopsis thaliana. However, information about the physiological role of FKF1 in day-neutral plants and even the physiological role other than photoperiodic flowering is lacking. Thus, the FKF1 homolog SlFKF1 was investigated in tomato, a day-neutral plant and a useful model for plants with fleshy fruit. It was confirmed that SlFKF1 belongs to the FKF1 group by phylogenetic tree analysis. The high sequence identity with A. thaliana FKF1, the conserved amino acids essential for function, and the similarity in the diurnal change in expression suggested that SlFKF1 may have similar functions to A. thaliana FKF1. CONSTANS (CO) is a transcription factor regulated by FKF1 and is responsible for the transcription of genes downstream of CO. cis-Regulatory elements targeted by CO were found in the promoter region of SINGLE FLOWER TRUSS (SFT) and RIN, which are involved in the regulation of flowering and fruit ripening, respectively. The blue-light effects on SlFKF1 expression, flowering, and fruit lycopene concentration have been observed in this study and previous studies. It was confirmed in RNA interference lines that the low expression of SlFKF1 is associated with late flowering with increased leaflets and low lycopene concentrations. This study sheds light on the various physiological roles of FKF1 in plants. View Full-Text
Keywords: Solanum lycopersicum; Solanaceae; FLAVIN-BINDING; KELCH REPEAT; F-BOX 1; blue light; flowering; ripening; lycopene Solanum lycopersicum; Solanaceae; FLAVIN-BINDING; KELCH REPEAT; F-BOX 1; blue light; flowering; ripening; lycopene
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MDPI and ACS Style

Shibuya, T.; Nishiyama, M.; Kato, K.; Kanayama, Y. Characterization of the FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 Homolog SlFKF1 in Tomato as a Model for Plants with Fleshy Fruit. Int. J. Mol. Sci. 2021, 22, 1735. https://doi.org/10.3390/ijms22041735

AMA Style

Shibuya T, Nishiyama M, Kato K, Kanayama Y. Characterization of the FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 Homolog SlFKF1 in Tomato as a Model for Plants with Fleshy Fruit. International Journal of Molecular Sciences. 2021; 22(4):1735. https://doi.org/10.3390/ijms22041735

Chicago/Turabian Style

Shibuya, Tomoki, Manabu Nishiyama, Kazuhisa Kato, and Yoshinori Kanayama. 2021. "Characterization of the FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 Homolog SlFKF1 in Tomato as a Model for Plants with Fleshy Fruit" International Journal of Molecular Sciences 22, no. 4: 1735. https://doi.org/10.3390/ijms22041735

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