Int. J. Mol. Sci. 2012, 13(3), 3458-3477; doi:10.3390/ijms13033458
Article

Homologous NF-YC2 Subunit from Arabidopsis and Tobacco Is Activated by Photooxidative Stress and Induces Flowering

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Received: 30 January 2012; in revised form: 29 February 2012 / Accepted: 1 March 2012 / Published: 13 March 2012
(This article belongs to the Special Issue Advances in Molecular Plant Biology)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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.

AMA Style

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.

Chicago/Turabian Style

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.

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