View source for Molecular Plant Pathology (2022) 23, 1170-1186

{{Publication
|Publication authors=Yuanyuan Jing, Minghui Zhan, Chunrong Li, Tingting Pei, [[Qi Wang]], Pengmin Li, Fengwang Ma and Changhai Liu
|Author Page=Qi Wang
|Publication date=2022
|dc:title=The apple FERONIA receptor-like kinase MdMRLK2 negatively regulates [[Cytospora mali|Valsa canker]] resistance by suppressing defence responses and hypersensitive reaction
|Publication journal=Molecular Plant Pathology
|prism:volume=23 (8)
|prism:startingPage=1170
|Last page=1186
|External link=https://dx.doi.org/10.1111/mpp.13218
|Publication abstract=Valsa canker, caused by the fungus ''Valsa mali'', is one of the most destructive diseases of apple trees in China and other East Asian countries. The plant receptor-like kinase FERONIA is involved in plant cell growth, development, and immunity. However, little is known about the function of FERONIA in apple defence against ''V''. ''mali''. In this study, we found that ''MdMRLK2'' was highly induced by ''V. mali'' in twigs of ''V. mali-''susceptible ''Malus mellana'' but not in those of the resistant species ''Malus yunnaensis''. 35S:''MdMRLK2'' apple plants showed compromised resistance relative to wild-type (WT) plants. Further analyses indicated that 35S:''MdMRLK2'' apple plants had enhanced abscisic acid (ABA) levels and reduced salicylic acid (SA) levels relative to the WT on ''V. mali'' infection. ''MdMRLK2'' overexpression also suppressed polyphenol accumulation and inhibited the activities of phenylalanine ammonia-lyase (PAL), β-1,3-glucanase (GLU), and chitinase (CHT) during ''V. mali'' infection. Moreover, MdMRLK2 interacted with MdHIR1, a hypersensitive-induced response protein, and suppressed the MdHIR1-mediated hypersensitive reaction (HR), probably by impairing MdHIR1 self-interaction. Collectively, these findings demonstrate that overexpression of ''MdMRLK2'' compromises Valsa canker resistance, probably by (a) altering ABA and SA levels, (b) suppressing polyphenol accumulation, (c) inhibiting PAL, GLU, and CHT activities, and (d) blocking MdHIR1-mediated HR by disrupting MdHIR1 self-interaction.
|AbstractCC=Yes
|Research topic=resistance/tolerance/defence of host
|Is book=No
}}
{{Pest record
|Pest=Cytospora mali
|Crop=Apple (Malus)
|Quarantined=No
}}