Induction of disease defense responses by SO2 during the preservation of ‘Red Globe’ grapes

Grapevine ( Vitis vinifera L.) is a major fruit crop worldwide that is highly susceptible to fungal infection. Grape industries are heavily reliant on sulfite preservatives. Currently, sulfur dioxide (SO 2 ) is the single most useful preservative in the preservation of freshness in the grape berry. However, its use is accompanied by a health warning, increasing the demand for lower-sulfite fruits. To identify a more appropriate food preservative for grape storage, we studied the preservative mechanisms of SO 2 during grape storage. The local table grape cultivar ‘Red Globe’ was used for this study and samples were stored at low temperatures with SO 2 fumigation. The enzyme activity of phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO), β -1,3-glucanase, and chitinase, as well as the secondary metabolites: total phenol, flavonoid, and lignin, were investigated following different periods of storage. The results showed that the application of SO 2 preservative effectively improved the good fruit rate and extended the storage life of grape berries. The fruit quality of SO 2 -fumigated grape berries was significantly higher than that of the control. During storage, the activity of PAL, the key enzyme in secondary metabolic pathways, was higher in SO 2 -fumigated fruits. Total phenol, flavonoid, and lignin content was markedly elevated in SO 2 - fumigated fruits. In addition, fruits exposed to SO 2 combined with low temperature exhibited lower PPO activity during storage. However, the activity of PPO in the SO 2 -fumigated group was still higher than that in the control was. Chitinase and β -1,3-glucanase activities in the SO 2 -fumigated group were significantly higher than in the non-fumigated group. Our results indicate that SO 2 fumigation activates secondary metabolic pathways and results in higher levels of pathogen-resistance-related secondary metabolic products, which could promote disease resistance and extend the storage period of grape berries.

• Publication year

  2017

• Venue

  Chinese Journal of Applied and Environmental Biology

• Publication date

  2017-10-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.3724/sp.j.1145.2016.10022
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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