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Open AccessArticle

The LNK Gene Family: At the Crossroad between Light Signaling and the Circadian Clock

1
Leloir Institute, Biochemical Research Institute of Buenos Aires (IIBBA)– National Scientific and Technical Research Council (CONICET), Av. Patricias Argentinas 435, Ciudad de Buenos Aires C1405BWE, Argentina
2
The Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 14 November 2018 / Revised: 13 December 2018 / Accepted: 17 December 2018 / Published: 20 December 2018
(This article belongs to the Special Issue Genetic Regulation of Circadian Rhythm in Plants)
Light signaling pathways interact with the circadian clock to help organisms synchronize physiological and developmental processes to periodic environmental cycles. The plant photoreceptors responsible for clock resetting have been characterized, but signaling components that link the photoreceptors to the clock remain to be identified. Members of the family of NIGHT LIGHT–INDUCIBLE AND CLOCK-REGULATED (LNK) genes play key roles linking light regulation of gene expression to the control of daily and seasonal rhythms in Arabidopsis thaliana. Particularly, LNK1 and LNK2 were shown to control circadian rhythms, photomorphogenic responses, and photoperiod-dependent flowering time. Here we analyze the role of the four members of the LNK family in Arabidopsis in these processes. We found that depletion of the closely related LNK3 and LNK4 in a lnk1;lnk2 mutant background affects circadian rhythms, but not other clock-regulated processes such as flowering time and seedling photomorphogenesis. Nevertheless, plants defective in all LNK genes (lnkQ quadruple mutants) display developmental alterations that lead to increased rosette size, biomass, and enhanced phototropic responses. Our work indicates that members of the LNK family have both distinctive and partially overlapping functions, and are an essential link to orchestrate light-regulated developmental processes. View Full-Text
Keywords: circadian clock; light signaling; circadian activators; NIGHT LIGHT–INDUCIBLE AND CLOCK-REGULATED; phototropism circadian clock; light signaling; circadian activators; NIGHT LIGHT–INDUCIBLE AND CLOCK-REGULATED; phototropism
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De Leone, M.J.; Hernando, C.E.; Romanowski, A.; García-Hourquet, M.; Careno, D.; Casal, J.; Rugnone, M.; Mora-García, S.; Yanovsky, M.J. The LNK Gene Family: At the Crossroad between Light Signaling and the Circadian Clock. Genes 2019, 10, 2.

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