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Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (10): 71-80.doi: 10.11707/j.1001-7488.20211007

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Metabolic Analysis of Phenolic Compounds Associated with Walnut Anthracnose

Xin Chen1,2,Min Wang3,Maorun Fu3,Guifang Wang1,Kun Xiang1,Qingzhong Liu1,Wenxiao Jiao3,Meiyong Zhang1,Haifeng Xu1,*   

  1. 1. Shandong Institute of Pomology, National Germplasm Repository Genebank for Walnut andChestnut Tai'an 271000
    2. Lvyuan Walnut Professional Cooperative in Feixian Linyi 273400
    3. College of Food Science and Engineering, Qilu University of Technology Jinan 250353
  • Received:2020-11-30 Online:2021-10-25 Published:2021-12-11
  • Contact: Haifeng Xu

Abstract:

Objective: This study aimed to provide references for exploring the mechanism of walnut resistance to anthracnose. For this end, we identified 130 phenolic compounds after the infection of Colletotrichum gloeosprioides into the walnut husk, carried out absolute quantification of the compounds, analyzed their changes, and screened the potential effective components against anthracnose. Method: In this study, walnut (Juglans regia) cultivars, 'Xiangling' and 'Taile', were used as the materials, and the walnut husk were inoculated with C. gloeosporioides, then the contents and related changes of phenolic compounds in walnut husk after infection were analyzed by targeted metabonomics. Result: With the increase of days after infection of C. gloeosporioides, the plaques on 'Xiangling' husk gradually increased and changed significantly on the 6th day, while the plaques on 'Taile' husk remained basically unchanged. The total amount of phenolic compounds in 'Xiangling' and 'Taile' husk was basically the same. The compounds were divided into 9 categories, among which were mainly procyanidins/anthocyanins, benzoic acid derivatives, flavonols and phenylpropanoids. 'Xiangling' had the most benzoic acids, accounting for more than 60%, and they were mainly gallic acid, syringic acid, ellagic acid and vanillic acid. While 'Taile' contained the most flavonols, nearly 30%, and they were mainly hyperin, quercitrin, avicularin and myricetin. On the 6th day of anthracnose infection, comparing with 'Xiangling', there were 60 different metabolites in 'Taile', among which52 different metabolites were up-regulated and 8 different metabolites were down-regulated. Among them, epicatechin 3-O-gallate, 4-Hydroxycinnamic acid, proanthocyanidin B1/2/3, phlorizin, syringic acid, ellagic acid and ferulic acid had significant differences. In addition, 47 substances such askaempferol and m-coumaric acid were not detected. On analysis of the differential metabolites in the 'Xiangling' and 'Taile' husk infected for 4-6 days with anthracnose, it was found that 6 compounds of caffeic acid, naringenin, eriodictyol, avicularin, quercetin and gallic acid changedobviously, which might be related to the significant changes in husk plaques. Conclusion: We have identified 130 phenolic compounds in the anthracnose resistant cultivar 'Taile' and the susceptible cultivar 'Xiangling'. Potential effective components against anthracnose, including proanthocyanidin B1/2/3, caffeic acid, naringenin, eriodictyol, avicularin, quercetin and gallic acid, have been screened by analyzing the dynamic changes of substances after anthracnose infection by using metabolomics. This study would provide references for the later development of anthracnose-related natural medicines and for exploring the mechanism of anthracnose.

Key words: metabonomics, walnut, anthracnose, phenolic compounds

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