Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8358510 | Plant Science | 2014 | 9 Pages |
Abstract
Chitinases are a group of pathogenesis-related proteins. The Brassica juncea chitinase gene BjCHI1 is highly inducible by pathogenic fungal infection, suggesting that the promoter of BjCHI1 might contain specific cis-acting element responsive to fungal attack. To identify the fungus-responsive element in BjCHI1 promoter (BjC-P), a series of binary plant transformation vectors were constructed by fusing the BjC-P or its deletion-derivatives to β-glucuronidase (GUS) reporter gene. Expression of the GUS reporter gene was systematically assayed by a transient gene expression system in Nicotiana benthamiana leaves treated with fungal elicitor Hexa-N-Acetyl-Chitohexaose, as well as in transgenic Arabidopsis plants inoculated with fungus Botrytis cinerea. The histochemical and quantitative GUS assays showed that the W-box-like element (GTAGTGACTCAT) in the region (â668 to â657) was necessary for the fungus-response, although there were another five W-box-like elements in BjC-P. In addition, gain-of-function analysis demonstrated that the fragment (â409 to â337) coupled to the W-box-like element was needed for full magnitude of the fungal induction. These results revealed the existence of a novel regulation mechanism of W-box-like element involved in plant pathogenic resistance, and will benefit the potential application of BjC-P in engineering crops.
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Authors
Ying Gao, Xin-Li Zan, Xue-Feng Wu, Lei Yao, Yu-Ling Chen, Shuang-Wei Jia, Kai-Jun Zhao,