期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 173, 期 -, 页码 62-71出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2014.09.007
关键词
Abiotic stress; Antioxidant enzyme; Cell wall peroxidase; Expansin; Methyl viologen
资金
- National Natural Science Foundation of China [31370304]
Expansins are cell wall proteins inducing cell wall loosening and participate in all plant growth and development processes which are associated with cell wall modifications. Here, TaEXPB23, a wheat expansin gene, was investigated and the tolerance to oxidative stress was strongly enhanced in over-expression tobacco plants. Our results revealed that over-expressing TaEXPB23 influenced the activity of antioxidant enzymes: in particular, the activity of the cell wall-bound peroxidase. The enhanced tolerance to oxidative stress and increased cell wall-bound peroxidase activity were partly inhibited by an anti-expansin antibody. The Arabidopsis expansin mutant atexpb2 showed reduced cell wall-bound peroxidase activity and decreased oxidative stress tolerance. In addition, atexpb2 exhibited lower chlorophyll contents and the germination rate compared to wild type (WT). Taken together, these results provided a new insight on the role of expansin proteins in plant stress tolerance by cell wall bound peroxidase. (C) 2014 Elsevier GmbH. All rights reserved.
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