title: Effect of sunlight-exposure on antioxidants and antioxidant enzyme activities in 'd'Anjou' pear in relation to superficial scald development.
abstract: Influence of preharvest sunlight exposure on superficial scald development in 'd'Anjou' pears during cold storage was investigated. The biochemical changes related to scald including α-farnesene, conjugated trienols (CTols), antioxidants, antioxidant enzyme activities were monitored among separated blushed and shaded peels of unbagged fruit as well as the whole peel of bagged fruit. In unbagged fruit, scald symptom was restricted to shaded peel; while there was no difference in α-farnesene between blushed and shaded peels, CTols increased significantly in shaded peel along with scald development after 3months storage. Bagging treatment increased both α-farnesene and CTols significantly and enhanced scald. Preharvest sunlight exposure significantly increased certain antioxidant contents and antioxidant enzyme activities in blushed peel at harvest and during storage. These results reveal a direct role of CTols during development of scald, however, antioxidant systems may play an important role in α-farnesene oxidation to CTols and scald susceptibility in 'd'Anjou pears.
authors.affiliation: Department of Horticulture, Oregon State University, Mid-Columbia Agricultural Research and Extension Center, 3005 Experiment Station Dr., Hood River, OR 97031, United States; National Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Taian, Shandong 271018, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: School of Horticulture, Anhui Agricultural University, Hefei, Anhui 230036, PR China.
authors.forename: Xingbin
authors.initials: X
authors.lastname: Xie
authors.affiliation: National Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Taian, Shandong 271018, PR China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
authors.affiliation: Department of Horticulture, Oregon State University, Mid-Columbia Agricultural Research and Extension Center, 3005 Experiment Station Dr., Hood River, OR 97031, United States. Electronic address: yan.wang@oregonstate.edu.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D005519:Food Preservation / Q000379:methods*; D010084:Oxidation-Reduction; D031989:Pyrus / Q000737:chemistry*; D012717:Sesquiterpenes / Q000032:analysis; D013472:Sunlight
chemical_list: D000975:Antioxidants; D012717:Sesquiterpenes; C062672:alpha-farnesene
keywords: Antioxidant enzymes; Antioxidants; Conjugated trienols; Pyrus communis; Sunlight exposure; Superficial scald; α-Farnesene