title: Salicylic acid treatment reduces the rot of postharvest citrus fruit by inducing the accumulation of H2O2, primary metabolites and lipophilic polymethoxylated flavones.
abstract: To comprehensively analyze the effects of salicylic acid (SA) on the storability of Satsuma mandarin (Citrus unshiu), fruits were treated with 2mM SA. The disease incidence of control/SA-treated fruit at 50d and 120d after treatment was 23.3%/10% and 67.3%/23.3%, respectively, suggesting that SA treatment can significantly reduce the rot rate of postharvest citrus fruit. Fruit quality assays revealed that the treatment can maintain fruit firmness without affecting the inner quality. Furthermore, the contents of H2O2 and some defense-related metabolites, such as ornithine and threonine, in citrus pericarp, were significantly increased by SA treatment. Moreover, it was lipophilic polymethoxylated flavones, rather than flavanone glycosides, that accumulated in SA-treated fruits and these can directly inhibit pathogen development. These results suggest that the effects of SA on postharvest citrus fruit may be attributed to the accumulation of H2O2 and defense-related metabolites.
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Jiajing
authors.initials: J
authors.lastname: Chen
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Xue
authors.initials: X
authors.lastname: Xiao
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Mingfei
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China; South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong 510650, PR China.
authors.forename: Ze
authors.initials: Z
authors.lastname: Yun
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Yunliu
authors.initials: Y
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Juan
authors.initials: J
authors.lastname: Xu
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China. Electronic address: yjcheng@mail.hzau.edu.cn.
authors.forename: Yunjiang
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China; Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region), MOA, Wuhan 430070, PR China.
authors.forename: Xiuxin
authors.initials: X
authors.lastname: Deng
mesh_terms: D002957:Citrus / Q000737:chemistry*; D047309:Flavones / Q000737:chemistry; D061353:Food Storage; D005638:Fruit / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D020156:Salicylic Acid / Q000737:chemistry / Q000627:therapeutic use*
chemical_list: D047309:Flavones; D006861:Hydrogen Peroxide; D020156:Salicylic Acid
keywords: Citrus fruit storage; Polymethoxylated flavones; Primary metabolites; Rot control; Salicylic acid