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Overexpression of the Rap2.4f transcriptional factor in Arabidopsis promotes leaf senescence

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Abstract

Senescence is a complex and highly regulated process. Leaf senescence is influenced by endogenous developmental and external environmental signals. In this work, we found that expression of an Ap2/DREB-type transcription factor gene, Arabidopsis Rap2.4f (At4g28140), was upregulated by salt, mannitol, and dark treatments. Constitutively overexpressing Rap2.4f under the control of the CaMV 35S promoter led to an increased chlorophyll degradation rate and upregulation of many senescence-associated genes in the transgenic Arabidopsis lines. Our results show that Rap2.4f is a positive regulator of senescence, promoting both developmental and dark-induced leaf senescence.

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Authors and Affiliations

  1. State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China

    Heng Xu, XueChen Wang & Jia Chen

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  1. Heng Xu
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  2. XueChen Wang
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  3. Jia Chen
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Correspondence to Jia Chen.

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Xu, H., Wang, X. & Chen, J. Overexpression of the Rap2.4f transcriptional factor in Arabidopsis promotes leaf senescence. Sci. China Life Sci. 53, 1221–1226 (2010). https://doi.org/10.1007/s11427-010-4068-3

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  • DOI: https://doi.org/10.1007/s11427-010-4068-3

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