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Plant function and evolutionary biology
RESEARCH ARTICLE

Plasmalemma localisation of DOUBLE HYBRID PROLINE-RICH PROTEIN 1 and its function in systemic acquired resistance of Arabidopsis thaliana

Ben-Chang Li A B , Chen Zhang A B , Qiu-Xia Chai A B , Yao-Yao Han A , Xiao-Yan Wang A , Meng-Xin Liu A , Huan Feng A and Zi-Qin Xu A C
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Provincial Key Laboratory of Biotechnology of Shaanxi, College of Life Sciences, Northwest University, Xi’an 710069, PR China.

B These authors contributed equally to this work.

C Corresponding author. Email: ziqinxu@nwu.edu.cn

Functional Plant Biology 41(7) 768-779 https://doi.org/10.1071/FP13314
Submitted: 26 October 2013  Accepted: 23 January 2014   Published: 11 March 2014

Abstract

The protein encoded by AtDHyPRP1 (DOUBLE HYBRID PROLINE-RICH PROTEIN 1) contains two tandem PRD-8CMs (proline-rich domain-eight cysteine motif) and represents a new type of HyPRPs (hybrid proline-rich proteins). Confocal microscopy to transgenic Arabidopsis plants revealed that AtDHyPRP1-GFP was localised to plasmalemma, especially plasmodesmata. AtDHyPRP1 mainly expressed in leaf tissues and could be induced by salicylic acid, methyl jasmonate, virulent Pseudomonas syringae pv. tomato DC3000 (Pst DC3000) and avirulent P. syringae pv. tomato DC3000 harbouring avrRPM1 (Pst avrRPM1), suggesting it is involved in defence response of Arabidopsis thaliana (L. Heynh.). After treatments with bacterial suspension of virulent Pst DC3000 or conidial suspension of Botrytis cinerea, AtDHyPRP1 overexpressing lines exhibited enhanced resistance, whereas AtDHyPRP1 RNA interference lines became more susceptible to the pathogens with obvious chlorosis or necrosis phenotypes. In systemic acquired resistance (SAR) analyses, distal leaves were challenged with virulent Pst DC3000 after inoculation of the primary leaves with avirulent Pst avrRPM1 (AV) or MgSO4 (MV). Compared with MV, the infection symptoms in systemic leaves of wild-type plants and AtDHyPRP1 overexpressing lines were significantly alleviated in AV treatment, whereas the systemic leaves of AtDHyPRP1 RNAi lines were vulnerable to Pst DC3000, indicating AtDHyPRP1 was functionally associated with SAR.

Additional keywords: hypersensitive response, lipid transfer protein, propidium iodide, quantitative RT-PCR.


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