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Comparative phosphoproteomic analysis of blast resistant and susceptible rice cultivars in response to salicylic acid.

Abstract：

BACKGROUND:Salicylic acid (SA) is a significant signaling molecule that induces rice resistance against pathogen invasion. Protein phosphorylation carries out an important regulatory function in plant defense responses, while the global phosphoproteome changes in rice response to SA-mediated defense response has not been reported. In this study, a comparative phosphoproteomic profiling was conducted by two-dimensional gel electrophoresis (2-DE) and mass spectrometry (MS) analysis, with two near-isogenic rice cultivars after SA treatment. RESULTS:Thirty-seven phosphoprotein spots were differentially expressed after SA treatment, twenty-nine of which were identified by MALDI-TOF/TOF MS, belonging to nine functional categories. Phosphoproteins involved in photosynthesis, antioxidative enzymes, molecular chaperones were similarly expressed in the two cultivars, suggesting SA might alleviate decreases in plant photosynthesis, regulate the antioxidant defense activities, thus improving basal resistance response in both cultivars. Meanwhile, phosphoproteins related to defense, carbohydrate metabolism, protein synthesis and degradation were differentially expressed, suggesting phosphorylation regulation mediated by SA may coordinate complex cellular activities in the two cultivars. Furthermore, the phosphorylation sites of four identified phosphoproteins were verified by NanoLC-MS/MS, and phosphorylated regulation of three enzymes (cinnamoyl-CoA reductase, phosphoglycerate mutase and ascorbate peroxidase) was validated by activity determination. CONCLUSIONS:Our study suggested that phosphorylation regulation mediated by SA may contribute to the different resistance response of the two cultivars. To our knowledge, this is the first report to measure rice phosphoproteomic changes in response to SA, which provides new insights into molecular mechanisms of SA-induced rice defense.

journal_name

BMC Plant Biol

journal_title

BMC plant biology

authors

Sun R,Qin S,Zhang T,Wang Z,Li H,Li Y,Nie Y

doi

10.1186/s12870-019-2075-5

subject

Has Abstract

pub_date

2019-10-28 00:00:00

pages

454

issue

issn

1471-2229

pii

10.1186/s12870-019-2075-5

journal_volume

pub_type

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Comparative phosphoproteomic analysis of blast resistant and susceptible rice cultivars in response to salicylic acid.