Interaction of barley powdery mildew effector candidate CSEP0055 with the defence protein PR17c.

Abstract:

:A large number of effector candidates have been identified recently in powdery mildew fungi. However, their roles and how they perform their functions remain unresolved. In this study, we made use of host-induced gene silencing and confirmed that the secreted barley powdery mildew effector candidate, CSEP0055, contributes to the aggressiveness of the fungus. This result suggests that CSEP0055 is involved in the suppression of plant defence. A yeast two-hybrid screen indicated that CSEP0055 interacts with members of the barley pathogenesis-related protein families, PR1 and PR17. Interaction with PR17c was confirmed by bimolecular fluorescence complementation analyses. Down-regulation and over-expression of PR17c in epidermal cells of barley confirmed that this protein is important for penetration resistance against the powdery mildew fungus. In line with this, PR17c was found to be apoplastic, localizing to the papillae formed in response to this fungus. The CSEP0055 transcript did not start to accumulate until 24 h after inoculation. This suggests that this gene is expressed too late to influence primary penetration events, but rather sustains the fungus at sites of secondary penetration, where PR17c appears to be able to accumulate.

journal_name

Mol Plant Pathol

authors

Zhang WJ,Pedersen C,Kwaaitaal M,Gregersen PL,Mørch SM,Hanisch S,Kristensen A,Fuglsang AT,Collinge DB,Thordal-Christensen H

doi

10.1111/j.1364-3703.2012.00820.x

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

1110-9

issue

9

eissn

1464-6722

issn

1364-3703

journal_volume

13

pub_type

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