Hort. Sci. (Prague), 2024, 51(4):278-285 | DOI: 10.17221/103/2023-HORTSCI

Comparison of phenylpropanoid metabolism of three physiological disorders in apple and pearOriginal Paper

Linru Wang1, Gengsen Liu1, Lianmei Liu2, Yugang Zhang1, Haiyong Qu ORCID...1
1 College of Horticulture, Qingdao Agricultural University, Qingdao City, P. R. China
2 Qixia Agricultural and Rural Bureau, Yantai, P. R. China

Apples and pears are the main temperate fruit tree species, and metabolic disorders may occur during their development and post-harvest storage periods, leading to physiological diseases. In this study, we detected the phenylalanine ammonia-lyase (PAL) enzyme and related metabolites involved in phenylpropanoid metabolism in the pulp of pear with hard-end or cork spot and in the pulp of apple with bitter pit. These three physiological disorders differed in phenylpropanoid metabolism and had similar PAL activity, but their polyphenol, flavonoid, and lignin contents changes were completely. For fruits with the three types of physiological metabolic disorders, the auxin content in the tissues with metabolic disorder symptoms was higher than that in the healthy tissues. In summary, the three physiological disorders showed similar changes in the activities of key enzymes (i.e., PAL) involved in phenylpropane metabolism, but their metabolites significantly differed.

Keywords: auxin; hard-end; cork spot; bitter pit; flavonoid; lignin

Received: September 12, 2023; Revised: March 17, 2024; Accepted: April 8, 2024; Prepublished online: December 3, 2024; Published: December 23, 2024  Show citation

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Wang L, Liu G, Liu L, Zhang Y, Qu H. Comparison of phenylpropanoid metabolism of three physiological disorders in apple and pear. Hort. Sci. (Prague). 2024;51(4):278-285. doi: 10.17221/103/2023-HORTSCI.
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