期刊
PLANT SCIENCE
卷 240, 期 -, 页码 161-169出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2015.09.002
关键词
Xylanase; Cell death; TAXI-III; XIP-I; Fusarium graminearum; Triticum durum
资金
- Progetto di Ateneo - University of Padova [CPDA109182]
- Italian Ministry of University and Research (PRIN)
To shed light on the role of Xylanase Inhibitors (XIs) during Fusarium graminearum infection, we first demonstrated that three out of four F. graminearum xylanases, in addition to their xylan degrading activity, have also the capacity to cause host cell death both in cell suspensions and wheat spike tissue. Subsequently, we demonstrated that TAXI-Ill and XIP-I prevented both the enzyme and host cell death activities of F. graminearum xylanases. In particular, we showed that the enzymatic inhibition by TAXI-Ill and XIP-I was competitive and only FGSG_11487 escaped inhibition. The finding that TAXI-III and XIP-I prevented cell death activity of heat inactivated xylanases and that XIP-I precluded the cell death activity of FGSG_11487 - even if XIP-I does not inhibit its enzyme activity - suggests that the catalytic and the cell death activities are separated features of these xylanases. Finally, the efficacy of TAXI-III or XIP-I to prevent host cell death caused by xylanases was confirmed in transgenic plants expressing separately these inhibitors, suggesting that the XIs could limit F. graminearum infection via direct inhibition of xylanase activity and/or by preventing host cell death. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
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