期刊
FRONTIERS IN PLANT SCIENCE
卷 13, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2022.953623
关键词
Ananas comosus; internal browning; ascorbic acid; the class III peroxidase; reactive oxygen species
资金
- National Key R&D Program of China
- Natural Science Foundation of Hainan Province
- [2018YFD1000500]
- [320MS089]
Excessive production of ROS can be toxic to organisms, but the PRXs class of peroxidases in plants play a crucial role in maintaining ROS homeostasis. In this study, pineapples were soaked in ascorbic acid to reduce ROS and PPO activity, which successfully restrained the spread of internal browning (IB). With the identification of 78 pineapple PRX genes, research revealed their potential role in negatively regulating IB occurrence. This research provides valuable insights for further understanding the molecular mechanisms of IB and developing IB-resistant pineapple varieties.
Excessive production of reactive oxygen species (ROS) leads to potential toxicity in an organism. Class III peroxidases (PRXs) play an important role in maintaining ROS homeostasis in plants. Internal browning (IB) limits industrial development of pineapple, which is the third most important fruit trade in the world. IB is mainly caused by ROS, and the mechanism underlying IB is still unknown from the perspective of ROS. Here, we soaked pineapples in ascorbic acid after harvest and before storage to decrease excessive ROS and polyphenol oxidase (PPO) activity, ultimately restraining the spread and deterioration of IB. Using phylogenetic analysis; we identified 78 pineapple PRX genes (AcPRXs) and divided them into five subgroups. Gene structure analysis indicated that the exon numbers ranged from 2 to 14, and conserved motif analysis verified that all of the AcPRXs identified here have standard peroxidase domains. Analysis of duplication events suggested that tandem and segmental duplication events may have played equal and important roles in expanding the AcPRX family. Comprehensive transcriptomic analysis uncovered that AcPRXs may play an important role in negatively regulating the occurrence of IB. In summary, we found that ROS scavenging delayed IB occurrence. The results of characterized AcPRX family revealed that AcPRXs family responded to growth and development, and negatively regulated to IB occurrence in storage stage. This research provides potential target genes for future in-depth analysis of the molecular mechanisms underlying IB and contributes to develop IB-resistant pineapple varieties.
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