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Homologous NF-YC2 Subunit from Arabidopsis and Tobacco Is Activated by Photooxidative Stress and Induces Flowering
Institute of Biology/Plant Physiology, Humboldt-Universität Berlin, Philippstr.13, Building 12, 10115 Berlin, Germany
Present address: Metanomics GmbH, a BASF Plant Science company, Tegeler Weg 33, 10589 Berlin, Germany
* Author to whom correspondence should be addressed.
Received: 30 January 2012; in revised form: 29 February 2012 / Accepted: 1 March 2012 / Published: 13 March 2012
Abstract: The transcription factor NF-Y consists of the three subunits A, B and C, which are encoded in Arabidopsis in large gene families. The multiplicity of the genes implies that NF-Y may act in diverse combinations of each subunit for the transcriptional control. We aimed to assign a function in stress response and plant development to NF-YC subunits by analyzing the expression of NF-Y genes and exploitation of nf-y mutants. Among the subunit family, NF-YC2 showed the strongest inducibility towards oxidative stress, e.g. photodynamic, light, oxidative, heat and drought stress. A tobacco NF-YC homologous gene was found to be inducible by photooxidative stress generated by an accumulation of the tetrapyrrole metabolite, coproporphyrin. Despite the stress induction, an Arabidopsis nf-yc2 mutant and NF-YC2 overexpressors did not show phenotypical differences compared to wild-type seedlings in response to photooxidative stress. This can be explained by the compensatory potential of other members of the NF-YC family. However, NF-YC2 overexpression leads to an early flowering phenotype that is correlated with increased FLOWERING LOCUS T-transcript levels. It is proposed that NF-YC2 functions in floral induction and is a candidate gene among the NF-Y family for the transcriptional activation upon oxidative stress.
Keywords: transcription factor; gene family; expression profile; photooxidative stress; flowering time
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MDPI and ACS Style
Hackenberg, D.; Keetman, U.; Grimm, B. Homologous NF-YC2 Subunit from Arabidopsis and Tobacco Is Activated by Photooxidative Stress and Induces Flowering. Int. J. Mol. Sci. 2012, 13, 3458-3477.
Hackenberg D, Keetman U, Grimm B. Homologous NF-YC2 Subunit from Arabidopsis and Tobacco Is Activated by Photooxidative Stress and Induces Flowering. International Journal of Molecular Sciences. 2012; 13(3):3458-3477.
Hackenberg, Dieter; Keetman, Ulrich; Grimm, Bernhard. 2012. "Homologous NF-YC2 Subunit from Arabidopsis and Tobacco Is Activated by Photooxidative Stress and Induces Flowering." Int. J. Mol. Sci. 13, no. 3: 3458-3477.