Enhanced tolerance to freezing in tobacco and tomato overexpressing transcription factor TERF2/LeERF2 is modulated by ethylene biosynthesis.

Plant Molecular Biology
Zhijin Zhang, Rongfeng Huang

Abstract

Increasing numbers of investigations indicate that ethylene response factor (ERF) proteins play important roles in plant stress responses via interacting with GCC box and/dehydration-responsive element/C-repeat to modulate expression of downstream genes, but the detailed regulatory mechanism is not well elucidated. Revealing the modulation pathway of ERF proteins in response to stresses is vital. Previously, we showed that tomato ERF protein TERF2/LeERF2 is ethylene inducible, and ethylene production is suppressed in antisense TERF2/LeERF2 tomatoes, suggesting that TERF2/LeERF2 functions as a positive regulator in ethylene biosynthesis. In this paper, we report that regulation of TERF2/LeERF2 in ethylene biosynthesis is associated with enhanced freezing tolerance of tobacco and tomato. Analysis of gene expression showed that cold slowly induces expression of TERF2/LeERF2 in tomato, implying that TERF2/LeERF2 may be involved in cold response through ethylene modulation. To test the hypothesis, we first observed that overexpressing TERF2/LeERF2 tobaccos not only enhances freezing tolerance via activating expression of cold-related genes, but also significantly reduces electrolyte leakage. In addition, with treatment of ethylene b...Continue Reading

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Citations

Sep 29, 2011·Yi chuan = Hereditas·Ao-Xue Wang, Xiu-Ling Chen
Jul 19, 2012·Yi chuan = Hereditas·Ji-Yu ZhangZhong-Ren Guo
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