Maize(Zea mays L.)stalk rot is a devastating disease worldwide,causing severe yield losses.Although previous studies have focused on the genetic dissection of maize resistance to stalk rot,the mechanisms of resistance remain largely unknown.We used a comparative proteomics approach to identify candidate proteins associated with stalk rot resistance.Statistical analyses revealed 763 proteins differentially accu-mulated between Fusarium graminearum and mock-inoculated plants.Among them,the antioxidant pro-tein ZmPrx5,which was up-accumulated in diseased plants,was selected for further study.ZmPrx5 transcripts were present in root,stalk,leaf,ear,and reproductive tissues.The expression of ZmPrx5 in three inbred lines increased significantly upon F.graminearum infection.ZmPrx5 was localized in the cytoplasm.Compared to control plants,maize plants overexpressing ZmPrx5 showed increased resistance to F.graminearum infection,and ZmPrx5 mutant plants were more susceptible than wild-type plants.Defense-associated pathways including plant-pathogen interactions,phenylalanine metabolism,and benzoxazinoid and flavonoid biosynthesis were suppressed in ZmPrx5 homozygous mutant plants com-pared with wild-type plants.We suggest that ZmPrx5 positively regulates resistance against stalk rot in maize,likely through defense-oriented transcriptome reprogramming.These results lay a foundation for further research on the roles of Prx5 subfamily proteins in resistance to plant fungal diseases,and provide a potential genetic resource for breeding disease-resistance maize lines.

Shunxi Wang;Wencheng Liu;Zan Chen;Jinghua Zhang;Xingmeng Jia;Mingyue Gou;Xueyan Chen;Yuqian Zhang;Hehuan Li;Yanhui Chen;Liuji Wu

National Key Laboratory of Wheat and Maize Crop Science,College of Agronomy,Henan Agricultural University,Zhengzhou 450002,Henan,China;State Key Laboratory of Crop Stress Adaptation and Improvement,State Key Laboratory of Cotton Biology,School of Life Sciences,Henan University,Kaifeng 475004,Henan,China3School of Environmental and Rural Science,University of New England,Armidale,NSW 2351,Australia

作物学报（英文版）

[1]Shunxi Wang;Wencheng Liu;Zan Chen;Jinghua Zhang;Xingmeng Jia;Mingyue Gou;Xueyan Chen;Yuqian Zhang;Hehuan Li;Yanhui Chen;Liuji Wu-.The antioxidant protein ZmPrx5 contributes resistance to maize stalk rot)[J].作物学报（英文版）,2022(04):1049-1058

ZmPrx5,benzoxazinoid,Prx5

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