Tomato plants overexpressing CaKR1 enhanced tolerance to salt and oxidative stress

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Title
Tomato plants overexpressing CaKR1 enhanced tolerance to salt and oxidative stress
Author(s)
E S Seong; Hye Sun Cho; D Choi; Y H Joung; C K Lim; J H Hur; M H Wang
Bibliographic Citation
Biochemical and Biophysical Research Communications, vol. 363, no. 4, pp. 983-988
Publication Year
2007
Abstract
CaKR1 from pepper leaves encodes an ankyrin repeat domain zinc finger that is thought to be involved in transcriptional regulation in response to pathogens and abiotic stresses. Transgenic tomato plants expressing CaKR1 show enhanced resistance to Phytophthora infestans. In this study, we further characterized this CaKR1-overexpressing transgenic tomato line. Morphologically, the leaves of the transgenic plants were thicker than those of control plants. Overexpressed transgenic plants also produced lower levels of free oxygen radicals, such as superoxide (O2-) and hydrogen peroxide (H2O2), and showed enhanced resistance to salinity and oxidative stress. In particular, transgenic plants produced higher levels of transcripts encoding the pathogenesis-related (PR) proteins LePR1, LePR2, and LePR3, as well as oxidative stress response proteins, such as superoxide dismutase (LeSOD2) and ascorbate peroxidase (LeAPX2 and LeAPX3). These results suggest that CaKR1 is a key signaling molecule regulating plant antioxidant metabolism and defense responses.
Keyword
CaKR1hydrogen peroxideoxidative stresssalt stresssuperoxidetransgenic tomato
ISSN
0006-291X
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.bbrc.2007.09.104
Type
Article
Appears in Collections:
Division of Research on National Challenges > Plant Systems Engineering Research > 1. Journal Articles
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