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High oxygen facilitates wound induction of suberin polyphenolics in kiwifruit
Author(s) -
Wei Xiaopeng,
Mao Linchun,
Han Xueyuan,
Lu Wenjing,
Xie Dandan,
Ren Xingchen,
Zhao Yuying
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8709
Subject(s) - suberin , polyphenol oxidase , chemistry , ferulic acid , polyphenol , oxygen , peroxidase , phenylalanine ammonia lyase , catalase , food science , botany , postharvest , wound healing , biochemistry , antioxidant , enzyme , organic chemistry , cell wall , biology , immunology
BACKGROUND Rapid wound healing would be critical for successful long‐term storage of fruits and vegetables. However, there was no direct evidence for the requirement and efficiency of oxygen in the fruit wound‐healing process. This study was conducted to investigate the role of oxygen in wound‐induced suberization by analyzing melanin, suberin polyphenolics (SPPs) and related enzymes in half‐cut kiwifruits exposed to 100%, 50%, 21% and 0% oxygen. RESULTS By 3 days after wounding, the wound surface of kiwifruit in high (50 and 100%) oxygen appeared as a continuous layer of melanin and SPPs underneath, which effectively prevent excessive water vapor loss from the fruit halves. In contrast, melanin and SPPs deposition in the wound surface in 0% oxygen was significantly reduced, with high water vapor loss. Rapid decrease of soluble phenolic acids (caffeic, p ‐coumaric, ferulic acids) was coupled with the increase of bound ferulic acid (coniferyl diacetate) especially in high oxygen by 9 days after wounding. Meanwhile, high oxygen enhanced peroxidase, catalase, phenylalanine ammonia‐lyase, and polyphenol oxidase activities. CONCLUSION Oxygen is required for wound‐induced melanin and SPPs formation, and high oxygen is effective in promoting wound suberization in postharvest kiwifruit. © 2017 Society of Chemical Industry